FACILITATING BEHAVIOR CHANGE AND WELL-BEING TO IMPROVE HEALTH OUTCOMES: STANDARDSOFMEDICAL CAREINDIABETESD2021 - DIABETES CARE

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Diabetes Care Volume 44, Supplement 1, January 2021                                                                                            S53

5. Facilitating Behavior Change                                                          American Diabetes Association

and Well-being to Improve Health
Outcomes: Standards of Medical
Care in Diabetesd2021
Diabetes Care 2021;44(Suppl. 1):S53–S72 | https://doi.org/10.2337/dc21-S005

                                                                                                                                                     5. FACILITATING BEHAVIOR CHANGE AND WELL-BEING
The American Diabetes Association (ADA) “Standards of Medical Care in Diabetes”
includes the ADA’s current clinical practice recommendations and is intended to
provide the components of diabetes care, general treatment goals and guidelines,
and tools to evaluate quality of care. Members of the ADA Professional Practice
Committee, a multidisciplinary expert committee (https://doi.org/10.2337/dc21-
SPPC), are responsible for updating the Standards of Care annually, or more
frequently as warranted. For a detailed description of ADA standards, statements,
and reports, as well as the evidence-grading system for ADA’s clinical practice
recommendations, please refer to the Standards of Care Introduction (https://doi
.org/10.2337/dc21-SINT). Readers who wish to comment on the Standards of Care
are invited to do so at professional.diabetes.org/SOC.

Effective behavior management and psychological well-being are foundational to
achieving treatment goals for people with diabetes (1,2). Essential to achieving these
goals are diabetes self-management education and support (DSMES), medical nutrition
therapy (MNT), routine physical activity, smoking cessation counseling when needed,
and psychosocial care. Following an initial comprehensive medical evaluation (see
Section 4 “Comprehensive Medical Evaluation and Assessment of Comorbidities,”
https://doi.org/10.2337/dc21-S004), patients and providers are encouraged to engage
in person-centered collaborative care (3–6), which is guided by shared decision-making
in treatment regimen selection, facilitation of obtaining needed medical and psycho-
social resources, and shared monitoring of agreed-upon regimen and lifestyle (7).
Reevaluation during routine care should include not only assessment of medical health,
but also behavioral and mental health outcomes, especially during times of de-
terioration in health and well-being.

DIABETES SELF-MANAGEMENT EDUCATION AND SUPPORT
 Recommendations                                                                         Suggested citation: American Diabetes Associa-
 5.1 In accordance with the national standards for diabetes self-management              tion. 5. Facilitating behavior change and well-
                                                                                         being to improve health outcomes: Standards of
     education and support, all people with diabetes should participate in diabetes
                                                                                         Medical Care in Diabetesd2021. Diabetes Care
     self-management education and receive the support needed to facilitate              2021;44(Suppl. 1):S53–S72
     the knowledge, decision-making, and skills mastery necessary for diabetes           © 2020 by the American Diabetes Association.
     self-care. A                                                                        Readers may use this article as long as the work is
 5.2 There are four critical times to evaluate the need for diabetes self-manage-        properly cited, the use is educational and not for
     ment education to promote skills acquisition in support of regimen imple-           profit, and the work is not altered. More infor-
     mentation, medical nutrition therapy, and well-being: at diagnosis, annually        mation is available at https://www.diabetesjournals
                                                                                         .org/content/license.
S54   Facilitating Behavior Change and Well-being to Improve Health Outcomes                Diabetes Care Volume 44, Supplement 1, January 2021

                                                       program (8) showed that addressing these      preferences, needs, and values. It ensures
               and/or when not meeting treat-
                                                       targets improved health outcomes in a         that patient values guide all decision-
               ment targets, when complicating
                                                       population in need of health care resour-     making (14).
               factors develop (medical, physi-
                                                       ces. Furthermore, following a DSMES cur-
               cal, psychosocial), and when tran-
                                                       riculum improves quality of care (9).         Evidence for the Benefits
               sitions in life and care occur. E
                                                           In addition, in response to the growing   Studies have found that DSMES is asso-
         5.3   Clinical outcomes, health status,
                                                       literature that associates potentially        ciated with improved diabetes knowl-
               and well-being are key goals of
                                                       judgmental words with increased feel-         edge and self-care behaviors (14,15),
               diabetes self-management edu-
                                                       ings of shame and guilt, providers are        lower A1C (14,16–19), lower self-reported
               cation and support that should
                                                       encouraged to consider the impact that        weight (20,21), improved quality of life
               be measured as part of routine
                                                       language has on building therapeutic          (17,22), reduced all-cause mortality risk
               care. C
                                                       relationships and to choose positive,         (23), healthy coping (5,24), and reduced
         5.4   Diabetes self-management edu-
                                                       strength-based words and phrases that         health care costs (25–27). Better out-
               cation and support should be pa-
                                                       put people first (4,10). Patient perfor-       comes were reported for DSMES inter-
               tient centered, may be given in
                                                       mance of self-management behaviors,           ventions that were more than 10 h over
               group or individual settings and/
                                                       as well as psychosocial factors with the      the course of 6–12 months (18), included
               or use technology, and should be
                                                       potential to impact the person’s self-        ongoing support (12,28), were culturally
               communicated with the entire
                                                       management, should be monitored. Please       (29,30) and age appropriate (31,32),
               diabetes care team. A
                                                       see Section 4 “Comprehensive Medical          were tailored to individual needs and
         5.5   Because diabetes self-management
                                                       Evaluation and Assessment of Comorbid-        preferences, and addressed psychoso-
               education and support can improve
                                                       ities” (https://doi.org/10.2337/dc21-S004)    cial issues and incorporated behavioral
               outcomes and reduce costs B, re-
                                                       for more on use of language.                  strategies (13,24,33,34). Individual and
               imbursement by third-party payers
                                                           DSMES and the current national stand-     group approaches are effective (21,35,
               is recommended. C
                                                       ards guiding it (2,11) are based on evi-      36), with a slight benefit realized by those
         5.6   Barrierstodiabetesself-management
                                                       dence of benefit. Specifically, DSMES           who engage in both (18).
               education and support exist at
                                                       helps people with diabetes to identify           Emerging evidence demonstrates the
               the health system, payor, provider,
                                                       and implement effective self-management       benefit of telemedicine or internet-
               and patient levels A and efforts
                                                       strategies and cope with diabetes at          based DSMES services for diabetes pre-
               need to be made to identify and
                                                       four critical time points (see below) (2).    vention and the management of type 2
               address them. E
                                                       Ongoing DSMES helps people with diabe-        diabetes (37–43). Technology-enabled di-
         5.7   Some barriers to diabetes self-
                                                       tes to maintain effective self-management     abetes self-management solutions im-
               management education and support
                                                       throughout a lifetime of diabetes as they     prove A1C most effectively when there
               access may be mitigated through
                                                       face new challenges and as advances in        is two-way communication between the
               telemedicine approaches. B
                                                       treatment become available (12).              patient and the health care team, in-
                                                           Four critical time points have been       dividualized feedback, use of patient-
       DSMES services facilitate the knowledge,
                                                       defined when the need for DSMES is to be       generated health data, and education
       decision-making, and skills mastery nec-
                                                       evaluated by the medical care provider        (39).
       essary for optimal diabetes self-care and
                                                       and/or multidisciplinary team, with re-          Current research supports diabetes care
       incorporate the needs, goals, and life
                                                       ferrals made as needed (2):                   and education specialists including nurses,
       experiences of the person with diabetes.
                                                                                                     dietitians, and pharmacists as providers
       The overall objectives of DSMES are to          1. At diagnosis
                                                                                                     of DSMES who may also tailor curriculum
       support informed decision-making, self-         2. Annually and/or when not meeting
                                                                                                     to the person’s needs (44–46). Members
       care behavior, problem-solving, and ac-            treatment targets
                                                                                                     of the DSMES team should have special-
       tive collaboration with the health care         3. When complicating factors (health
                                                                                                     ized clinical knowledge in diabetes and
       team to improve clinical outcomes, health          conditions, physical limitations, emo-
                                                                                                     behavior change principles. Certification
       status, and well-being in a cost-effective         tional factors, or basic living needs)
                                                                                                     as a diabetes care and education specialist
       manner (2). Providers are encouraged to            develop that influence self-management
                                                                                                     (see https://www.cbdce.org/) and/or
       consider the burden of treatment and the        4. When transitions in life and care
                                                                                                     board certification in advanced diabetes
       patient’s level of confidence/self-efficacy          occur
                                                                                                     management (see www.diabeteseducator
       for management behaviors as well as the            DSMES focuses on supporting patient        .org/education/certification/bc_adm)
       level of social and family support when         empowerment by providing people with          demonstrates an individual’s specialized
       providing DSMES. Patient performance of         diabetes the tools to make informed self-     training in and understanding of diabetes
       self-management behaviors, including its        management decisions (13). Diabetes           management and support (11), and en-
       effect on clinical outcomes, health status,     care requires an approach that places         gagement with qualified providers has
       and quality of life, as well as the psycho-     the person with diabetes and his or her       been shown to improve disease-related
       social factors impacting the person’s abil-     family/support system at the center of        outcomes. Additionally, there is growing
       ity to self-manage, should be monitored         the care model, working in collabora-         evidence for the role of community
       as part of routine clinical care. A random-     tion with health care professionals.          health workers (47,48), as well as peer
       ized controlled trial testing a decision-       Patient-centered care is respectful of        (47–51) and lay leaders (52), in providing
       making education and skill-building             and responsive to individual patient          ongoing support.
care.diabetesjournals.org                                             Facilitating Behavior Change and Well-being to Improve Health Outcomes   S55

    Evidence suggests people with diabe-       of Diabetes Care & Education Specialists        Table 5.1 for specific nutrition recommen-
tes who completed more than 10 hours           (ADCES). DSMES is also covered by most          dations. Because of the progressive nature
of DSMES over the course of 6–12 months        health insurance plans. Ongoing support         of type 2 diabetes, behavior modification
and those who participated on an ongo-         has been shown to be instrumental for           alone may not be adequate to maintain
ing basis had significant reductions in         improving outcomes when it is imple-            euglycemia over time. However, after med-
mortality (23) and A1C (decrease of            mented after the completion of educa-           ication is initiated, nutrition therapy con-
0.57%) (18) compared with those who            tion services. DSMES is frequently reimbursed   tinues to be an important component and
spent less time with a diabetes care and       when performed in person. However,              RD/RDNs providing MNT in diabetes care
education specialist. Given individual         although DSMES can also be provided             should assess and monitor medication
needs and access to resources, a variety       via phone calls and telehealth, these           changes in relation to the nutrition care
of culturally adapted DSMES programs           remote versions may not always be re-           plan (46,63).
need to be offered in a variety of settings.   imbursed. Some barriers to DSMES access
Use of technology to facilitate access to      may be mitigated through telemedicine           Goals of Nutrition Therapy for Adults
DSMES services, support self-management        approaches. Changes in reimbursement            With Diabetes
decisions, and decrease therapeutic in-        policies that increase DSMES access and         1. To promote and support healthful
ertia suggests that these approaches need      utilization will result in a positive im-          eating patterns, emphasizing a variety
broader adoption.                              pact to beneficiaries’ clinical outcomes,           of nutrient-dense foods in appropriate
    DSMES is associated with an increased      quality of life, health care utilization,          portion sizes, to improve overall health
use of primary care and preventive serv-       and costs (60–62). During the time of              and:
ices (25,53,54) and less frequent use of       the coronavirus disease 2019 (COVID-               c achieve and maintain body weight
acute care and inpatient hospital services     19) pandemic, reimbursement policies                  goals
(20). Patients who participate in DSMES        have changed (https://professional                 c attain individualized glycemic, blood
are more likely to follow best practice        .diabetes.org/content-page/dsmes-and-                 pressure, and lipid goals
treatment recommendations, particularly        mnt-during-covid-19-national-pandemic),            c delay or prevent the complications
among the Medicare population, and             and these changes may provide a new                   of diabetes
have lower Medicare and insurance claim        reimbursement paradigm for future               2. To address individual nutrition needs
costs (26,53). Despite these benefits, re-      provision of DSMES through telehealth              based on personal and cultural prefer-
ports indicate that only 5–7% of individ-      channels.                                          ences, health literacy and numeracy,
uals eligible for DSMES through Medicare                                                          access to healthful foods, willingness
or a private insurance plan actually receive                                                      and ability to make behavioral changes,
it (55,56). Barriers to DSMES exist at the     MEDICAL NUTRITION THERAPY                          and existing barriers to change
health system, payor, provider, and pa-        Please refer to the ADA consensus report        3. To maintain the pleasure of eating by
tient levels. This low participation may be    “Nutrition Therapy for Adults With Di-             providing nonjudgmental messages
due to lack of referral or other identified     abetes or Prediabetes: A Consensus Re-             about food choices while limiting
barriers such as logistical issues (accessi-   port” for more information on nutrition            food choices only when indicated
bility, timing, costs) and the lack of a       therapy (46). For many individuals with            by scientific evidence
perceived benefit (56). Health system,          diabetes, the most challenging part of the      4. To provide an individual with diabetes
programmatic, and payor barriers include       treatment plan is determining what to eat.         the practical tools for developing healthy
lack of administrative leadership support,     There is not a “one-size-fits-all” eating           eating patterns rather than focusing
limited numbers of DSMES providers, not        pattern for individuals with diabetes, and         on individual macronutrients, micro-
having referral to DSMES services effec-       meal planning should be individualized.            nutrients, or single foods
tively embedded in the health system           Nutrition therapy plays an integral role in
service structure, and limited reimburse-      overall diabetes management, and each           Eating Patterns and Meal Planning
ment rates (57). Thus, in addition to          person with diabetes should be actively         Evidence suggests that there is not an
educating referring providers about the        engaged in education, self-management,          ideal percentage of calories from carbo-
benefits of DSMES and the critical times to     and treatment planning with his or her          hydrate, protein, and fat for people with
refer, efforts need to be made to identify     health care team, including the collabo-        diabetes. Therefore, macronutrient dis-
and address all of the various potential       rative development of an individualized         tribution should be based on an individ-
barriers (2). Alternative and innovative       eating plan (46,63). All providers should       ualized assessment of current eating
models of DSMES delivery need to be            refer people with diabetes for individu-        patterns, preferences, and metabolic goals.
explored and evaluated, including the          alized MNT provided by a registered di-         Consider personal preferences (e.g., tra-
integration of technology-enabled diabe-       etitian nutritionist (RD/RDN) who is            dition, culture, religion, health beliefs and
tes and cardiometabolic health services        knowledgeable and skilled in providing          goals, economics) as well as metabolic
(58,59).                                       diabetes-specific MNT (64) at diagnosis          goals when working with individuals to
                                               and as needed throughout the life span,         determine the best eating pattern for
Reimbursement                                  similar to DSMES. MNT delivered by an           them (46,66,67). Members of the health
Medicare reimburses DSMES when that            RD/RDN is associated with A1C absolute          care team should complement MNT
service meets the national standards           decreases of 1.0–1.9% for people with           by providing evidence-based guidance
(2,11) and is recognized by the American       type 1 diabetes (65) and 0.3–2.0% for           that helps people with diabetes make
Diabetes Association (ADA) or Association      people with type 2 diabetes (65). See           healthy food choices that meet their
S56   Facilitating Behavior Change and Well-being to Improve Health Outcomes                        Diabetes Care Volume 44, Supplement 1, January 2021

         Table 5.1—Medical nutrition therapy recommendations
         Topic                                                                                    Recommendation
         Effectiveness of nutrition therapy               5.8 An individualized medical nutrition therapy program as needed to achieve treatment goals,
                                                              provided by a registered dietitian nutritionist (RD/RDN), preferably one who has
                                                              comprehensive knowledge and experience in diabetes care, is recommended for all people
                                                              with type 1 or type 2 diabetes, prediabetes, and gestational diabetes mellitus. A
                                                          5.9 Because diabetes medical nutrition therapy can result in cost savings B and improved
                                                              outcomes (e.g., A1C reduction, reduced weight, decrease in cholesterol) A, medical
                                                              nutrition therapy should be adequately reimbursed by insurance and other payers. E
         Energy balance                                   5.10 For all patients with overweight or obesity, lifestyle modification to achieve and maintain
                                                               a minimum weight loss of 5% is recommended for all patients with diabetes and
                                                               prediabetes. A
         Eating patterns and macronutrient distribution   5.11 There is no single ideal dietary distribution of calories among carbohydrates, fats, and
                                                               proteins for people with diabetes; therefore, meal plans should be individualized while
                                                               keeping total calorie and metabolic goals in mind. E
                                                          5.12 A variety of eating patterns can be considered for the management of type 2 diabetes and
                                                               to prevent diabetes in individuals with prediabetes. B
         Carbohydrates                                    5.13 Carbohydrate intake should emphasize nutrient-dense carbohydrate sources that are high
                                                               in fiber and minimally processed. Eating plans should emphasize nonstarchy vegetables,
                                                               minimal added sugars, fruits, whole grains, as well as dairy products. B
                                                          5.14 Reducing overall carbohydrate intake for individuals with diabetes has demonstrated the
                                                               most evidence for improving glycemia and may be applied in a variety of eating patterns
                                                               that meet individual needs and preferences. B
                                                          5.15 For people with diabetes who are prescribed a flexible insulin therapy program, education
                                                               on how to use carbohydrate counting A and on dosing for fat and protein content B should
                                                               be used to determine mealtime insulin dosing.
                                                          5.16 For adults using fixed insulin doses, consistent pattern of carbohydrate intake with respect
                                                               to time and amount, while considering the insulin action time, can result in improved
                                                               glycemia and reduce the risk for hypoglycemia. B
                                                          5.17 People with diabetes and those at risk are advised to replace sugar-sweetened beverages
                                                               (including fruit juices) with water as much as possible in order to control glycemia and
                                                               weight and reduce their risk for cardiovascular disease and fatty liver B and should minimize
                                                               the consumption of foods with added sugar that have the capacity to displace healthier,
                                                               more nutrient-dense food choices. A
         Protein                                          5.18 In individuals with type 2 diabetes, ingested protein appears to increase insulin response
                                                               without increasing plasma glucose concentrations. Therefore, carbohydrate sources high in
                                                               protein should be avoided when trying to treat or prevent hypoglycemia. B
         Dietary fat                                      5.19 An eating plan emphasizing elements of a Mediterranean-style eating pattern rich in
                                                               monounsaturated and polyunsaturated fats may be considered to improve glucose
                                                               metabolism and lower cardiovascular disease risk. B
                                                          5.20 Eating foods rich in long-chain n-3 fatty acids, such as fatty fish (EPA and DHA) and nuts and
                                                               seeds (ALA), is recommended to prevent or treat cardiovascular disease. B
         Micronutrients and herbal supplements            5.21 There is no clear evidence that dietary supplementation with vitamins, minerals (such as
                                                               chromium and vitamin D), herbs, or spices (such as cinnamon or aloe vera) can improve
                                                               outcomes in people with diabetes who do not have underlying deficiencies, and they are
                                                               not generally recommended for glycemic control. C
         Alcohol                                          5.22 Adults with diabetes who drink alcohol should do so in moderation (no more than one drink
                                                               per day for adult women and no more than two drinks per day for adult men). C
                                                          5.23 Educating people with diabetes about the signs, symptoms, and self-management of
                                                               delayed hypoglycemia after drinking alcohol, especially when using insulin or insulin
                                                               secretagogues, is recommended. The importance of glucose monitoring after drinking
                                                               alcoholic beverages to reduce hypoglycemia risk should be emphasized. B
         Sodium                                           5.24 As for the general population, people with diabetes and prediabetes should limit sodium
                                                               consumption to ,2,300 mg/day. B
         Nonnutritive sweeteners                          5.25 The use of nonnutritive sweeteners may have the potential to reduce overall calorie and
                                                               carbohydrate intake if substituted for caloric (sugar) sweeteners and without compensation
                                                               by intake of additional calories from other food sources. For those who consume sugar-
                                                               sweetened beverages regularly, a low-calorie or nonnutritive-sweetened beverage may
                                                               serve as a short-term replacement strategy, but overall, people are encouraged to decrease
                                                               both sweetened and nonnutritive-sweetened beverages and use other alternatives, with an
                                                               emphasis on water intake. B
care.diabetesjournals.org                                           Facilitating Behavior Change and Well-being to Improve Health Outcomes   S57

individualized needs and improve over-        the potential risk of ketoacidosis (78,79).   People with prediabetes at a healthy
all health. A variety of eating patterns      There is inadequate research in type 1        weight should also be considered for
are acceptable for the management of          diabetes to support one eating pattern        behavioral interventions to help estab-
diabetes (46,66,68,69). Until the evi-        over another at this time.                    lish routine aerobic and resistance exer-
dence surrounding comparative bene-              A randomized controlled trial found        cise (83,86,87) as well as to establish
fits of different eating patterns in specific   that two meal planning approaches were        healthy eating patterns. Services deliv-
individuals strengthens, health care pro-     effective in helping achieve improved         ered by practitioners familiar with diabe-
viders should focus on the key factors        A1C, particularly for individuals with        tes and its management, such as an RD/
that are common among the patterns: 1)        an A1C between 7% and 10% (80). The           RDN, have been found to be effective
emphasize nonstarchy vegetables, 2) min-      diabetes plate method is a commonly           (64).
imize added sugars and refined grains,         used visual approach for providing basic         For many individuals with overweight
and 3) choose whole foods over highly         meal planning guidance. This simple           and obesity with type 2 diabetes, 5%
processed foods to the extent possible        graphic (featuring a 9-inch plate) shows      weight loss is needed to achieve bene-
(46). An individualized eating pattern also   how to portion foods (1/2 of the plate for    ficial outcomes in glycemic control, lipids,
considers the individual’s health status,     nonstarchy vegetables, 1/4 of the plate       and blood pressure (88). It should be
skills, resources, food preferences, and      for protein, and 1/4 of the plate for         noted, however, that the clinical benefits
health goals. Referral to an RD/RDN is        carbohydrates). Carbohydrate counting         of weight loss are progressive, and more
essential to assess the overall nutrition     is a more advanced skill that helps plan      intensive weight loss goals (i.e., 15%) may
status of, and to work collaboratively        for and track how much carbohydrate is        be appropriate to maximize benefit de-
with, the patient to create a personal-       consumed at meals and snacks. Meal            pending on need, feasibility, and safety
ized meal plan that coordinates and           planning approaches should be custom-         (89,90). In select individuals with type 2
aligns with the overall treatment plan,       ized to the individual, including their       diabetes, an overall healthy eating plan
including physical activity and medication    numeracy level (80).                          that results in energy deficit in conjunc-
use. The Mediterranean-style (67,70–72),                                                    tion with weight loss medications and/or
low-carbohydrate (73–75), and vegetarian      Weight Management                             metabolic surgery should be considered
or plant-based (71,72,76,77) eating pat-      Management and reduction of weight is         to help achieve weight loss and mainte-
terns are all examples of healthful eating    important for people with type 1 diabe-       nance goals, lower A1C, and reduce CVD
patterns that have shown positive results     tes, type 2 diabetes, or prediabetes and      risk (84,91,92). Overweight and obesity
in research, but individualized meal plan-    overweight or obesity. To support weight      are also increasingly prevalent in people
ning should focus on personal preferen-       loss and improve A1C, cardiovascular          with type 1 diabetes and present clinical
ces, needs, and goals.                        disease (CVD) risk factors, and well-being    challenges regarding diabetes treatment
    Reducing overall carbohydrate intake      in adults with overweight/obesity and         and CVD risk factors (93,94). Sustaining
for individuals with diabetes has dem-        prediabetes or diabetes, MNT and DSMES        weight loss can be challenging (88,95) but
onstrated the most evidence for improv-       services should include an individualized     has long-term benefits; maintaining weight
ing glycemia and may be applied in            eating plan in a format that results in an    loss for 5 years is associated with sus-
a variety of eating patterns that meet        energy deficit in combination with en-         tained improvements in A1C and lipid
individual needs and preferences (46).        hanced physical activity (46). Lifestyle      levels (96). MNT guidance from an RD/
For individuals with type 2 diabetes not      intervention programs should be inten-        RDN with expertise in diabetes and weight
meeting glycemic targets or for whom          sive and have frequent follow-up to           management, throughout the course of
reducing glucose-lowering drugs is a          achieve significant reductions in excess       a structured weight loss plan, is strongly
priority, reducing overall carbohydrate       body weight and improve clinical indica-      recommended.
intake with a low- or very-low-carbohydrate   tors. There is strong and consistent ev-         People with diabetes and prediabetes
eating pattern is a viable option (73–75).    idence that modest persistent weight          should be screened and evaluated dur-
As research studies on low-carbohydrate       loss can delay the progression from pre-      ing DSMES and MNT encounters for
eating plans generally indicate chal-         diabetes to type 2 diabetes (66,81,82)        disordered eating, and nutrition therapy
lenges with long-term sustainability, it      (see Section 3 “Prevention or Delay of        should be individualized to accommo-
is important to reassess and individualize    Type 2 Diabetes,” https://doi.org/10          date disorders (46). Disordered eating
meal plan guidance regularly for those        .2337/dc20-S003) and is beneficial to          can make following an eating plan chal-
interested in this approach, recognizing      the management of type 2 diabetes             lenging, and individuals should be re-
that insulin and other diabetes medica-       (see Section 8 “Obesity Management            ferred to a mental health professional
tions may need to be adjusted to prevent      for the Treatment of Type 2 Diabetes,”        as needed. Studies have demonstrated
hypoglycemia and blood pressure will need     https://doi.org/10.2337/dc20-S008).           that a variety of eating plans, varying
to be monitored. Very-low-carbohydrate           In prediabetes, the weight loss goal is    in macronutrient composition, can be
eating patterns are not recommended           7–10% for preventing progression to type      used effectively and safely in the short
at this time for women who are pregnant       2 diabetes (83). In conjunction with          term (1–2 years) to achieve weight loss in
or lactating, people with or at risk for      support for healthy lifestyle behaviors,      people with diabetes. This includes struc-
disordered eating, or people who have         medication-assisted weight loss can           tured low-calorie meal plans with meal
renal disease, and they should be used        be considered for people at risk for          replacements (89,96,97), the Mediterranean-
with caution in patients taking sodium–       type 2 diabetes when needed to achieve        style eating pattern (98), and low-
glucose cotransporter 2 inhibitors due to     and sustain 7–10% weight loss (84,85).        carbohydrate meal plans with additional
S58   Facilitating Behavior Change and Well-being to Improve Health Outcomes                  Diabetes Care Volume 44, Supplement 1, January 2021

       support (99,100). However, no single            carbohydrate-restricted eating patterns,        recommended for the general public.
       approach has been proven to be consis-          particularly those considered very low          The Dietary Guidelines for Americans
       tently superior (46,101–103), and more          carbohydrate (,26% total energy), were          recommend a minimum of 14 g of fi-
       data are needed to identify and validate        effective in reducing A1C in the short term     ber/1,000 kcal, with at least half of grain
       those meal plans that are optimal with          (,6 months), with less difference in eating     consumption being whole, intact grains
       respect to long-term outcomes and pa-           patterns beyond 1 year (73,74,103,115).         (118). Regular intake of sufficient dietary
       tient acceptability. The importance of          Part of the challenge in interpreting low-      fiber is associated with lower all-cause mor-
       providing guidance on an individualized         carbohydrate research has been due to           tality in people with diabetes (119,120), and
       meal plan containing nutrient-dense foods,      the wide range of definitions for a low-         prospective cohort studies have found
       such as vegetables, fruits, legumes, dairy,     carbohydrate eating plan (75,113). Weight       dietary fiber intake is inversely associated
       lean sources of protein (including plant-       reduction was also a goal in many low-          with risk of type 2 diabetes (121,122).
       based sources as well as lean meats, fish,       carbohydrate studies, which further com-        The consumption of sugar-sweetened
       and poultry), nuts, seeds, and whole grains,    plicates evaluating the distinct contribution   beverages and processed food products
       cannot be overemphasized (102), as well         of the eating pattern (40,99,103,116). As       with high amounts of refined grains and
       as guidance on achieving the desired            research studies on low-carbohydrate            added sugars is strongly discouraged
       energy deficit (104–107). Any approach           eating plans generally indicate challenges      (118,123,124).
       to meal planning should be individualized       with long-term sustainability (115), it is         Individuals with type 1 or type 2 di-
       considering the health status, personal         important to reassess and individualize         abetes taking insulin at mealtime should
       preferences, and ability of the person          meal plan guidance regularly for those          be offered intensive and ongoing edu-
       with diabetes to sustain the recommen-          interested in this approach. Providers          cation on the need to couple insulin
       dations in the plan.                            should maintain consistent medical over-        administration with carbohydrate intake.
                                                       sight and recognize that insulin and other      For people whose meal schedule or
       Carbohydrates                                   diabetes medications may need to be             carbohydrate consumption is variable,
       Studies examining the ideal amount of           adjusted to prevent hypoglycemia and            regular counseling to help them under-
       carbohydrate intake for people with di-         blood pressure will need to be monitored.       stand the complex relationship between
       abetes are inconclusive, although monitor-      In addition, very-low-carbohydrate eating       carbohydrate intake and insulin needs is
       ing carbohydrate intake and considering the     plans are not currently recommended for         important. In addition, education on
       blood glucose response to dietary car-          women who are pregnant or lactating,            using the insulin-to-carbohydrate ratios
       bohydrate are key for improving post-           children, people who have renal disease,        for meal planning can assist them with
       prandial glucose management (108,109).          or people with or at risk for disordered        effectively modifying insulin dosing from
       The literature concerning glycemic index        eating, and these plans should be used with     meal to meal and improving glycemic
       and glycemic load in individuals with           caution in those taking sodium–glucose          management (66,108,125–128). Results
       diabetes is complex, often with varying         cotransporter 2 inhibitors because of the       from recent high-fat and/or high-protein
       definitions of low and high glycemic in-         potential risk of ketoacidosis (78,79). There   mixed meals studies continue to sup-
       dex foods (110,111). The glycemic index         is inadequate research about dietary pat-       port previous findings that glucose re-
       ranks carbohydrate foods on their post-         terns for type 1 diabetes to support one        sponse to mixed meals high in protein
       prandial glycemic response, and glyce-          eating plan over another at this time (117).    and/or fat along with carbohydrate
       mic load takes into account both the                Most individuals with diabetes report a     differs among individuals; therefore,
       glycemic index of foods and the amount          moderate intake of carbohydrate (44–            a cautious approach to increasing insulin
       of carbohydrate eaten. Studies have             46% of total calories) (66). Efforts to         doses for high-fat and/or high-protein
       found mixed results regarding the effect        modify habitual eating patterns are of-         mixed meals is recommended to ad-
       of glycemic index and glycemic load on          ten unsuccessful in the long term; peo-         dress delayed hyperglycemia that may
       fasting glucose levels and A1C, with one        ple generally go back to their usual            occur 3 h or more after eating (46).
       systematic review finding no significant          macronutrient distribution (66). Thus,          Checking glucose 3 h after eating may
       impact on A1C (112), while two others           the recommended approach is to individ-         help to determine if additional insulin
       demonstrated A1C reductions of 0.15%            ualize meal plans with a macronutrient          adjustments are required (129,130).
       (110) to 0.5% (113).                            distribution that is more consistent with       Continuous glucose monitoring or self-
          Reducing overall carbohydrate intake         personal preference and usual intake to         monitoring of blood glucose should
       for individuals with diabetes has dem-          increase the likelihood for long-term           guide decision-making for administration
       onstrated evidence for improving glyce-         maintenance.                                    of additional insulin. For individuals on
       mia and may be applied in a variety of              As for all individuals in developed coun-   a fixed daily insulin schedule, meal
       eating patterns that meet individual            tries, both children and adults with di-        planning should emphasize a relatively
       needs and preferences (46). For people          abetes are encouraged to minimize intake        fixed carbohydrate consumption pattern
       with type 2 diabetes, low-carbohydrate          of refined carbohydrates and added sug-          with respect to both time and amount,
       and very-low-carbohydrate eating pat-           ars and instead focus on carbohydrates          while considering insulin action time
       terns, in particular, have been found to        from vegetables, legumes, fruits, dairy         (46).
       reduce A1C and the need for antihyper-          (milk and yogurt), and whole grains.
       glycemic medications (46,67,114,115).           People with diabetes and those at risk          Protein
       Systematic reviews and meta-analyses            for diabetes are encouraged to consume          There is no evidence that adjusting the
       of randomized controlled trials found           at least the amount of dietary fiber             daily level of protein intake (typically
care.diabetesjournals.org                                            Facilitating Behavior Change and Well-being to Improve Health Outcomes      S59

1–1.5 g/kg body wt/day or 15–20% total           Evidence does not conclusively support        with vitamin B12 deficiency per a report
calories) will improve health, and re-        recommending n-3 (eicosapentaenoic acid          from the Diabetes Prevention Program
search is inconclusive regarding the ideal    [EPA] and docosahexaenoic acid [DHA])            Outcomes Study (DPPOS), suggesting
amount of dietary protein to optimize         supplements for all people with diabetes         that periodic testing of vitamin B12 levels
either glycemic management or CVD             for the prevention or treatment of cardio-       should be considered in patients taking
risk (111,131). Therefore, protein intake     vascular events (46,145,146). In individuals     metformin, particularly in those with ane-
goals should be individualized based on       with type 2 diabetes, two systematic re-         miaorperipheralneuropathy(154).Routine
current eating patterns. Some research        views with n-3 and n-6fatty acids concluded      supplementation with antioxidants, such as
has found successful management of            that the dietary supplements did not im-         vitaminsEandCandcarotene,isnotadvised
type 2 diabetes with meal plans including     prove glycemic management (111,147). In          due to lack of evidence of efficacy and
slightly higher levels of protein (20–30%),   the ASCEND trial (A Study of Cardiovas-          concern related to long-term safety. In
which may contribute to increased             cular Events iN Diabetes), when compared         addition, there is insufficient evidence to
satiety (132).                                with placebo, supplementation with n-3           support the routine use of herbal supple-
    Historically, low-protein eating plans    fatty acids at the dose of 1 g/day did not       ments and micronutrients, such as cinna-
were advised for individuals with diabetic    lead to cardiovascular benefit in people          mon (155), curcumin, vitamin D (156), aloe
kidney disease (DKD) (with albuminuria        with diabetes without evidence of CVD            vera, or chromium, to improve glycemia in
and/or reduced estimated glomerular           (148). However, results from the Reduc-          people with diabetes (46,157). However,
filtration rate); however, new evidence        tion of Cardiovascular Events With Icosa-        for special populations, including preg-
does not suggest that people with DKD         pent Ethyl–Intervention Trial (REDUCE-IT)        nant or lactating women, older adults,
need to restrict protein to less than the     did find that supplementation with 4 g/           vegetarians, and people following very-
generally recommended protein intake          day of pure EPA significantly lowered the         low-calorie or low-carbohydrate diets, a
(46). Reducing the amount of dietary          risk of adverse cardiovascular events. This      multivitamin may be necessary.
protein below the recommended daily           trial of 8,179 participants, in which over
allowance of 0.8 g/kg is not recommen-        50% had diabetes, found a 5% absolute            Alcohol
ded because it does not alter glycemic        reduction in cardiovascular events for in-       Moderate alcohol intake does not have
measures, cardiovascular risk measures,       dividuals with established atherosclerotic       major detrimental effects on long-term
or the rate at which glomerular filtration     CVD taking a preexisting statin with re-         blood glucose management in people
rate declines and may increase risk for       sidual hypertriglyceridemia (135–499 mg/         with diabetes. Risks associated with alco-
malnutrition (133,134).                       dL) (149). See Section 10 “Cardiovascular        hol consumption include hypoglycemia
    In individuals with type 2 diabetes,      Disease and Risk Management” (https://           and/or delayed hypoglycemia (particu-
protein intake may enhance or increase        doi.org/10.2337/dc21-S010) for more in-          larly for those using insulin or insulin
the insulin response to dietary carbohy-      formation. People with diabetes should be        secretagogue therapies), weight gain,
drates (135). Therefore, use of carbohy-      advised to follow the guidelines for the         and hyperglycemia (for those consuming
drate sources high in protein (such as milk   general population for the recommended           excessive amounts) (46,157). People
and nuts) to treat or prevent hypoglyce-      intakes ofsaturated fat, dietarycholesterol,     with diabetes should be educated about
mia should be avoided due to the poten-       and trans fat (118). Trans fats should be        these risks and encouraged to monitor
tial concurrent rise in endogenous insulin.   avoided. In addition, as saturated fats are      blood glucose frequently after drinking
                                              progressively decreased in the diet, they        alcohol to minimize such risks. People
Fats                                          shouldbe replacedwith unsaturated fats and       with diabetes can follow the same guide-
The ideal amount of dietary fat for in-       not with refined carbohydrates (143).             lines as those without diabetes if they
dividuals with diabetes is controversial.                                                      choose to drink. For women, no more than
New evidence suggests that there is not       Sodium                                           one drink per day, and for men, no more
an ideal percentage of calories from fat      As for the general population, people            than two drinks per day is recommended
for people with or at risk for diabetes and   with diabetes are advised to limit their         (one drink is equal to a 12-oz beer, a 5-oz
that macronutrient distribution should        sodium consumption to ,2,300 mg/day              glass of wine, or 1.5 oz of distilled spirits).
be individualized according to the pa-        (46). Restriction below 1,500 mg, even
tient’s eating patterns, preferences, and     for those with hypertension, is generally        Nonnutritive Sweeteners
metabolic goals (46). The type of fats        not recommended (150–152). Sodium                The U.S. Food and Drug Administration
consumed is more important than total         recommendations should take into account         has approved many nonnutritive sweet-
amount of fat when looking at metabolic       palatability, availability, affordability, and   eners for consumption by the general
goals and CVD risk, and it is recommen-       the difficulty of achieving low-sodium rec-       public, including people with diabetes
ded that the percentage of total calories     ommendations in a nutritionally adequate         (46,158). For some people with diabetes
from saturated fats should be limited         diet (153).                                      who are accustomed to regularly con-
(98,118,136–138). Multiple randomized                                                          suming sugar-sweetened products, non-
controlled trials including patients with     Micronutrients and Supplements                   nutritive sweeteners (containing few or
type 2 diabetes have reported that a          There continues to be no clear evidence          no calories) may be an acceptable sub-
Mediterranean-style eating pattern (98,       of benefit from herbal or nonherbal (i.e.,        stitute for nutritive sweeteners (those
139–144), rich in polyunsaturated and         vitamin or mineral) supplementation for          containing calories, such as sugar, honey,
monounsaturated fats, can improve both        people with diabetes without underlying          and agave syrup) when consumed in
glycemic management and blood lipids.         deficiencies (46). Metformin is associated        moderation (159,160). Use of nonnutritive
S60   Facilitating Behavior Change and Well-being to Improve Health Outcomes                 Diabetes Care Volume 44, Supplement 1, January 2021

       sweeteners does not appear to have a                                                           observational study of adults with
                                                              decrease the amount of time
       significant effect on glycemic management                                                       type 1 diabetes suggested that higher
                                                              spent in daily sedentary behav-
       (66,66a), but they can reduce overall                                                          amounts of physical activity led to re-
                                                              ior. B Prolonged sitting should
       calorie and carbohydrate intake (66), as                                                       duced cardiovascular mortality after a
                                                              be interrupted every 30 min for
       long as individuals are not compensating                                                       mean follow-up time of 11.4 years for
                                                              blood glucose benefits. C
       with additional calories from other food                                                       patients with and without chronic kid-
                                                         5.30 Flexibility training and balance
       sources (46). There is mixed evidence from                                                     ney disease (170). Additionally, struc-
                                                              training are recommended 2–3
       systematic reviews and meta-analyses                                                           tured exercise interventions of at least
                                                              times/week for older adults with
       for nonnutritive sweetener use with re-                                                        8 weeks’ duration have been shown to
                                                              diabetes. Yoga and tai chi may
       gard to weight management, with some                                                           lower A1C by an average of 0.66% in
                                                              be included based on individual
       finding benefit in weight loss (161,162),                                                        people with type 2 diabetes, even
                                                              preferences to increase flexibil-
       while other research suggests an associ-                                                       without a significant change in BMI
                                                              ity, muscular strength, and bal-
       ation with weight gain (163). The addition                                                     (171). There are also considerable data
                                                              ance. C
       of nonnutritive sweeteners to diets poses                                                      for the health benefits (e.g., increased
                                                         5.31 Evaluate baseline physical activ-
       no benefit for weight loss or reduced                                                           cardiovascular fitness, greater muscle
                                                              ity and sedentary time. Promote
       weight gain without energy restriction                                                         strength, improved insulin sensitivity,
                                                              increase innonsedentaryactivities
       (163a). Low-calorie or nonnutritive-sweet-                                                     etc.) of regular exercise for those with
                                                              above baseline for sedentary in-
       ened beverages may serve as a short-term                                                       type 1 diabetes (172). A recent study
                                                              dividuals with type 1 E and type
       replacement strategy; however, people                                                          suggested that exercise training in
                                                              2 B diabetes. Examples include
       with diabetes should be encouraged to                                                          type 1 diabetes may also improve several
                                                              walking, yoga, housework, gar-
       decrease both sweetened and nonnutri-                                                          important markers such as triglyceride
                                                              dening, swimming, and dancing.
       tive-sweetened beverages, with an em-                                                          level, LDL, waist circumference, and
       phasis on water intake (160). Additionally,                                                    body mass (173). In adults with type 2
                                                       Physical activity is a general term that
       some research has found that higher non-                                                       diabetes, higher levels of exercise inten-
                                                       includes all movement that increases
       nutritive-sweetened beverage and sugar-                                                        sity are associated with greater improve-
                                                       energy use and is an important part of
       sweetened beverage consumption may                                                             ments in A1C and in cardiorespiratory
                                                       the diabetes management plan. Exercise
       be positively associated with the devel-                                                       fitness (174); sustained improvements
                                                       is a more specific form of physical activity
       opment of type 2 diabetes, although                                                            in cardiorespiratory fitness and weight
                                                       that is structured and designed to im-
       substantial heterogeneity makes inter-                                                         loss have also been associated with a
                                                       prove physical fitness. Both physical ac-
       preting the results difficult (164–166).                                                        lower risk of heart failure (175). Other
                                                       tivity and exercise are important. Exercise    benefits include slowing the decline in
       PHYSICAL ACTIVITY                               has been shown to improve blood glucose        mobility among overweight patients with
                                                       control, reduce cardiovascular risk factors,   diabetes (176). The ADA position state-
         Recommendations                               contribute to weight loss, and improve         ment “Physical Activity/Exercise and Di-
         5.26 Children and adolescents with            well-being (167). Physical activity is as      abetes” reviews the evidence for the
              type 1 or type 2 diabetes or pre-        important for those with type 1 diabetes       benefits of exercise in people with
              diabetes should engage in 60 min/        as it is for the general population, but its   type 1 and type 2 diabetes and offers
              day or more of moderate- or              specific role in the prevention of diabetes     specific recommendations (177). Physical
              vigorous-intensity aerobic activity,     complications and the management of            activity and exercise should be recom-
              with vigorous muscle-strengthening       blood glucose is not as clear as it is for     mended and prescribed to all individuals
              and bone-strengthening activi-           those with type 2 diabetes. A recent study     with diabetes as part of management of
              ties at least 3 days/week. C             suggested that the percentage of people        glycemia and overall health. Specific rec-
         5.27 Most adults with type 1 C and            with diabetes who achieved the recom-          ommendations and precautions will vary
              type 2 B diabetes should engage
                                                       mended exercise level per week (150 min)       by the type of diabetes, age, activity done,
              in 150 min or more of moderate-
                                                       varied by race. Objective measurement          and presence of diabetes-related health
              to vigorous-intensity aerobic ac-
                                                       by accelerometer showed that 44.2%,            complications. Recommendations should
              tivityperweek,spreadoveratleast
                                                       42.6%, and 65.1% of Whites, African Amer-      be tailored to meet the specific needs of
              3 days/week, with no more than
                                                       icans, and Hispanics, respectively, met        each individual (177).
              2 consecutive days without ac-
                                                       the threshold (168). It is important for
              tivity.Shorterdurations(minimum
                                                       diabetes care management teams to              Exercise and Children
              75min/week)ofvigorous-intensity
                                                       understand the difficulty that many             All children, including children with di-
              or interval training may be suffi-
                                                       patients have reaching recommended             abetes or prediabetes, should be encour-
              cient for younger and more phys-
                                                       treatment targets and to identify in-          aged to engage in regular physical activity.
              ically fit individuals.
                                                       dividualized approaches to improve             Children should engage in at least 60 min
         5.28 Adults with type 1 C and type 2 B
                                                       goal achievement.                              of moderate to vigorous aerobic activ-
              diabetes should engage in 2–3
                                                          Moderate to high volumes of aerobic         ity every day, with muscle- and bone-
              sessions/week of resistance ex-
                                                       activity are associated with substan-          strengthening activities at least 3 days
              ercise on nonconsecutive days.
                                                       tially lower cardiovascular and overall        per week (178). In general, youth with
         5.29 All adults, and particularly those
                                                       mortality risks in both type 1 and type        type 1 diabetes benefit from being
              with type 2 diabetes, should
                                                       2 diabetes (169). A recent prospective         physically active, and an active lifestyle
care.diabetesjournals.org                                               Facilitating Behavior Change and Well-being to Improve Health Outcomes   S61

should be recommended to all (179).              expenditure (e.g., working at a computer,       Pre-exercise Evaluation
Youth with type 1 diabetes who engage            watching television)dby breaking up             As discussed more fully in Section 10
in more physical activity may have               bouts of sedentary activity (.30 min)           “Cardiovascular Disease and Risk Manage-
better health outcomes and health-               by briefly standing, walking, or per-            ment” (https://doi.org/10.2337/dc21-S010),
related quality of life (180,181).               forming other light physical activities         the best protocol for assessing asymp-
                                                 (187,188). Participating in leisure-time        tomatic patients with diabetes for cor-
Frequency and Type of Physical                   activity and avoiding extended seden-           onary artery disease remains unclear.
Activity                                         tary periods may help prevent type 2            The ADA consensus report “Screening
People with diabetes should perform              diabetes for those at risk (189,190) and        for Coronary Artery Disease in Patients
aerobic and resistance exercise regularly        may also aid in glycemic control for            With Diabetes” (197) concluded that
(177). Aerobic activity bouts should ide-        those with diabetes.                            routine testing is not recommended.
ally last at least 10 min, with the goal of         A systematic review and meta-analysis        However, providers should perform a
;30 min/day or more, most days of the            found higher frequency of regular leisure-      careful history, assess cardiovascular risk
week for adults with type 2 diabetes. Daily      time physical activity was more effec-          factors, and be aware of the atypical pre-
exercise, or at least not allowing more          tive in reducing A1C levels (191). A            sentation of coronary artery disease, such as
than 2 days to elapse between exercise           wide range of activities, including             recent patient-reported or tested decrease
sessions, is recommended to decrease             yoga, tai chi, and other types, can             in exercise tolerance, in patients with
insulin resistance, regardless of diabetes       have significant impacts on A1C, flex-            diabetes. Certainly, high-risk patients
type (182,183). A study in adults with           ibility, muscle strength, and balance           should be encouraged to start with short
type 1 diabetes found a dose-response            (167,192–194). Flexibility and balance          periods of low-intensity exercise and slowly
inverse relationship between self-reported       exercises may be particularly impor-            increase the intensity and duration as
bouts of physical activity per week with         tant in older adults with diabetes to           tolerated. Providers should assess patients
A1C, BMI, hypertension, dyslipidemia, and        maintain range of motion, strength,             for conditions that might contraindicate
diabetes-related complications, such as          and balance (177).                              certain types of exercise or predispose to
hypoglycemia, diabetic ketoacidosis, reti-                                                       injury, such as uncontrolled hypertension,
nopathy and microalbuminuria (184). Over         Physical Activity and Glycemic Control          untreated proliferative retinopathy, auto-
time, activities should progress in intensity,   Clinical trials have provided strong evi-       nomic neuropathy, peripheral neuropathy,
frequency, and/or duration to at least           dence for the A1C-lowering value of             and a history of foot ulcers or Charcot foot.
150 min/week of moderate-intensity ex-           resistance training in older adults with        The patient’s age and previous physical
ercise. Adults able to run at 6 miles/h          type 2 diabetes (195) and for an additive       activity level should be considered when
(9.7 km/h) for at least 25 min can benefit        benefit of combined aerobic and resis-           customizing the exercise regimen to the
sufficiently from shorter-intensity activity      tance exercise in adults with type 2 diabetes   individual’s needs. Those with complica-
(75 min/week) (177). Many adults, includ-        (196). If not contraindicated, patients         tions may need a more thorough evaluation
ing most with type 2 diabetes, may be            with type 2 diabetes should be encour-          prior to starting an exercise program (198).
unable or unwilling to participate in such       aged to do at least two weekly sessions
intense exercise and should engage in            of resistance exercise (exercise with free      Hypoglycemia
moderate exercise for the recommen-              weights or weight machines), with each          In individuals taking insulin and/or insulin
ded duration. Adults with diabetes should        session consisting of at least one set          secretagogues, physical activity may
engage in 2–3 sessions/week of resistance        (group of consecutive repetitive exer-          cause hypoglycemia if the medication
exercise on nonconsecutive days (185).           cise motions) of five or more different          dose or carbohydrate consumption is
Although heavier resistance training with        resistance exercises involving the large        not adjusted for the exercise bout and
free weights and weight machines may             muscle groups (195).                            post-bout impact on glucose. Individuals
improve glycemic control and strength               For type 1 diabetes, although exercise       on these therapies may need to ingest
(186), resistance training of any intensity is   in general is associated with improve-          some added carbohydrate if pre-exercise
recommended to improve strength, bal-            ment in disease status, care needs to be        glucose levels are ,90 mg/dL (5.0 mmol/
ance, and the ability to engage in activities    taken in titrating exercise with respect to     L), depending on whether they are able to
of daily living throughout the life span.        glycemic management. Each individual            lower insulin doses during the workout
Providers and staff should help patients         with type 1 diabetes has a variable gly-        (such as with an insulin pump or reduced
set stepwise goals toward meeting the            cemic response to exercise. This variability    pre-exercise insulin dosage), the time of
recommended exercise targets. As indi-           should be taken into consideration when         day exercise is done, and the intensity
viduals intensify their exercise program,        recommending the type and duration              and duration of the activity (172,198).
medical monitoring may be indicated to           of exercise for a given individual              In some patients, hypoglycemia after
ensure safety and evaluate the effects on        (172).                                          exercise may occur and last for several
glucose management. (See the section                Women with preexisting diabetes,             hours due to increased insulin sensi-
PHYSICAL ACTIVITY AND GLYCEMIC CONTROL below)    particularly type 2 diabetes, and those         tivity. Hypoglycemia is less common in
   Recent evidence supports that all in-         at risk for or presenting with gestational      patients with diabetes who are not
dividuals, including those with diabetes,        diabetes mellitus should be advised to          treated with insulin or insulin secreta-
should be encouraged to reduce the               engage in regular moderate physical ac-         gogues, and no routine preventive
amount of time spent being sedentaryd            tivity prior to and during their pregnancies    measures for hypoglycemia are usually
waking behaviors with low energy                 as tolerated (177).                             advised in these cases. Intense activities
S62   Facilitating Behavior Change and Well-being to Improve Health Outcomes                  Diabetes Care Volume 44, Supplement 1, January 2021

       may actually raise blood glucose levels          hypotension, impaired thermoregula-           cost-effectiveness of brief counseling
       instead of lowering them, especially if          tion, impaired night vision due to im-        in smoking cessation, including the use
       pre-exercise glucose levels are elevated         paired papillary reaction, and greater        of telephone quit lines, in reducing to-
       (172). Because of the variation in glycemic      susceptibility to hypoglycemia (202). Car-    bacco use. Pharmacologic therapy to
       response to exercise bouts, patients need        diovascular autonomic neuropathy is           assist with smoking cessation in people
       to be educated to check blood glucose            also an independent risk factor for           with diabetes has been shown to be
       levels before and after periods of exercise      cardiovascular death and silent myo-          effective (214), and for the patient mo-
       and about the potential prolonged effects        cardial ischemia (203). Therefore, in-        tivated to quit, the addition of pharma-
       (depending on intensity and duration) (see       dividuals with diabetic autonomic             cologic therapy to counseling is more
       the section DIABETES SELF-MANAGEMENT EDUCATION   neuropathy should undergo cardiac             effective than either treatment alone
       AND SUPPORT above).                              investigation before beginning physical       (215). Special considerations should
                                                        activity more intense than that to which      include assessment of level of nicotine
       Exercise in the Presence of                      they are accustomed.                          dependence, which is associated with
       Microvascular Complications                      Diabetic Kidney Disease                       difficulty in quitting and relapse (216).
       See Section 11 “Microvascular Compli-            Physical activity can acutely increase uri-   Although some patients may gain weight
       cations and Foot Care” (https://doi.org/         nary albumin excretion. However, there        in the period shortly after smoking ces-
       10.2337/dc21-S011) for more informa-             is no evidence that vigorous-intensity        sation (217), recent research has demon-
       tion on these long-term complications.           exercise accelerates the rate of progres-     strated that this weight gain does not
       Retinopathy                                      sion of DKD, and there appears to be no       diminish the substantial CVD benefit re-
       If proliferative diabetic retinopathy or         need for specific exercise restrictions for    alized from smoking cessation (218). One
       severe nonproliferative diabetic retinop-        people with DKD in general (199).             study in people who smoke who had
       athy is present, then vigorous-intensity                                                       newly diagnosed type 2 diabetes found
       aerobic or resistance exercise may be                                                          that smoking cessation was associated
                                                        SMOKING CESSATION: TOBACCO
       contraindicated because of the risk of                                                         with amelioration of metabolic param-
                                                        AND E-CIGARETTES
       triggering vitreous hemorrhage or ret-                                                         eters and reduced blood pressure and
       inal detachment (199). Consultation with          Recommendations                              albuminuria at 1 year (219).
       an ophthalmologist prior to engaging              5.32 Advise all patients not to use             In recent years, e-cigarettes have
       in an intense exercise regimen may be                  cigarettes and other tobacco            gained public awareness and popularity
       appropriate.                                           products or e-cigarettes. A             because of perceptions that e-cigarette
                                                         5.33 After identification of tobacco or       use is less harmful than regular cigarette
       Peripheral Neuropathy                                                                          smoking (220,221). However, in light of
                                                              e-cigarette use, include smoking
       Decreased pain sensation and a higher                  cessation counseling and other          recent Centers for Disease Control and
       pain threshold in the extremities can re-              forms of treatment as a routine         Prevention evidence (222) of deaths re-
       sult in an increased risk of skin breakdown,           component of diabetes care. A           lated to e-cigarette use, no persons
       infection, and Charcot joint destruction          5.34 Address smoking cessation as            should be advised to use e-cigarettes,
       with some forms of exercise. Therefore, a              part of diabetes education pro-         either as a way to stop smoking tobacco
       thorough assessment should be done to                  grams for those in need. B              or as a recreational drug.
       ensure that neuropathy does not alter                                                             Diabetes education programs offer
       kinesthetic or proprioceptive sensation          Results from epidemiologic, case-             potential to systematically reach and
       during physical activity, particularly in        control, and cohort studies provide con-      engage individuals with diabetes in
       those with more severe neuropathy. Stud-         vincing evidence to support the causal        smoking cessation efforts. A cluster
       ies have shown that moderate-intensity           link between cigarette smoking and            randomized trial found statistically sig-
       walking may not lead to an increased risk        health risks (204). Recent data show          nificant increases in quit rates and long-
       of foot ulcers or reulceration in those with     tobacco use is higher among adults            term abstinence rates (.6 months)
       peripheral neuropathy who use proper             with chronic conditions (205) as well         when smoking cessation interventions
       footwear (200). In addition, 150 min/week        as in adolescents and young adults with       were offered through diabetes educa-
       of moderate exercise was reported to             diabetes (206). People with diabetes          tion clinics, regardless of motivation to
       improve outcomes in patients with pre-           who smoke (and people with diabetes           quit at baseline (223).
       diabetic neuropathy (201). All individ-          exposed to second-hand smoke) have a
       uals with peripheral neuropathy should           heightened risk of CVD, premature death,
       wear proper footwear and examine                 microvascular complications, and worse        PSYCHOSOCIAL ISSUES
       their feet daily to detect lesions early.        glycemic control when compared with            Recommendations
       Anyone with a foot injury or open sore           those who do not smoke (207–209). Smok-
       should be restricted to non–weight-                                                             5.35 Psychosocial care should be in-
                                                        ing may have a role in the development              tegrated with a collaborative,
       bearing activities.                              of type 2 diabetes (210–213).                       patient-centered approach and
       Autonomic Neuropathy                                The routine and thorough assessment              provided to all people with di-
       Autonomic neuropathy can increase the            of tobacco use is essential to prevent              abetes, with the goals of opti-
       risk of exercise-induced injury or ad-           smoking or encourage cessation. Nu-                 mizing health outcomes and
       verse events through decreased cardiac           merous large randomized clinical trials             health-related quality of life. A
       responsiveness to exercise, postural             have demonstrated the efficacy and
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