Nutritional Recommendations for Individuals with Diabetes

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INTRODUCTION

This chapter will summarize current information on nutritional recommendations for persons with diabetes for health care practitioners who treat them. The key take home message is that the 1800 calorie ADA diet is dead! The modern diet for the individual with diabetes is based on concepts from clinical research, portion control, and individualized lifestyle changes. It cannot simply be delivered by giving a patient a diet sheet in a one-size-fits-all approach. The lifestyle modification guidance and support needed requires a team effort, best led by an expert in this area; a registered dietitian (RD), or a referral to a diabetes self-management education (DSME) program that includes instruction on nutrition therapy. Dietary recommendations need to be individualized for and accepted by the given patient. It’s important to note that the nutrition goals for diabetes are similar to those that healthy individuals should strive to incorporate into their lifestyle.

Leading authorities and professional organizations have concluded that proper nutrition is an important part of the foundation for the treatment of diabetes. However, appropriate nutritional treatment, implementation, and ultimate compliance with the plan remain some of the most vexing problems in diabetic management for three major reasons: First, there are some differences in the dietary structure to consider, depending on the type of diabetes. Second, a plethora of dietary information is available from many sources to the patient and healthcare provider. Nutritional science is constantly evolving, so that what may be considered true today may be outdated in the near future. Different types of diabetes require some specialized nutritional intervention; however, many of the basic dietary principles are similar for all patients with diabetes, prediabetes, metabolic syndrome or who are overweight or obese. Lastly, there is not perfect agreement among professionals as to the best nutritional therapy for individuals with diabetes, and ongoing scientific debate that spills over into the popular press may confuse patients and health care providers.

The following recommendations are consensus-based, and they emphasize practical suggestions for implementing nutritional advice for most individuals with diabetes.

Ali et al, recently reported that although there have been improvements in risk factor control and adherence to preventative practices, almost half of U.S. adults with diabetes did not meet the recommended goals for diabetes care. [1] Thus, still more needs to be done to improve overall care of patients with diabetes.

NUTRITION THERAPY RECOMMENDATIONS FOR THE MANAGEMENT OF ADULTS WITH DIABETES BY THE AMERICAN DIABETES ASSOCIATION, 2013

GENERAL GOALS

The nutrition therapy goals for the individual with diabetes have evolved in the past few years and have become more flexible and user-friendly. These goals include the following:[2]

  • To promote and support healthful eating patterns, emphasizing a variety of nutrient dense foods in appropriate portion sizes in order to improve overall health and specifically to:

    • A1C <7%

    • Blood pressure,<140/80mmHg

    • LDL cholesterol ,<100 mg/dL

    • triglycerides <150 mg/dL

    • HDL cholesterol.>40 mg/dL for men

    • HDL cholesterol .>50 mg/dL for women

    Attain individualized glycemic, blood pressure, and lipid goals. General recommended goals from the ADA for these markers are as follows:*

  • Achieve and maintain body weight goals

  • Delay or prevent complications of diabetes

  • To address individual nutrition needs based on personal and cultural preferences, health literacy and numeracy, access to healthful food choices, willingness and ability to make behavioral changes, as well as barriers to change

  • To maintain the pleasure of eating by providing positive messages about food choices while limiting food choices only when indicated by scientific evidence

  • To provide the individual with diabetes with practical tools for day-to-day meal planning rather than focusing on individual macronutrients, micronutrients

*A1C, blood pressure, and cholesterol goals may need to be adjusted for the individual based on age, duration of diabetes, health history, and other present health conditions. Further recommendations

for individualization of goals can be found in the ADA Standards of Medical Care in Diabetes [3].

GOALS FOR SPECIFIC CLINICAL SITUATIONS

The goals of medical nutrition therapy (MNT) as they apply to specific clinical situations include the following: [4]

  1. For individuals with type 1 diabetes, participation in an intensive flexible insulin therapy education program using the carbohydrate counting meal planning approach can result in improved glycemic control.

  2. For individuals using fixed daily insulin doses, consistent carbohydrate intake with respect to time and amount can result in improved glycemic control and reduce the risk for hypoglycemia.

  3. A simple diabetes meal planning approach such as portion control or healthful food choices may be better suited to individuals with type 2 diabetes identified with health and numeracy literacy concerns. This may also be an effective meal planning strategy for older adults.

  4. People with diabetes should receive DSME according to national standards and DSMS when their diabetes is diagnosed and as needed thereafter.

PUTTING GOALS INTO PRACTICE

How should these goals best be put into practice? The following guidelines will address the above goals and help put them to work for your patients. The Diabetes Control and Complications Trial (DCCT) and other studies demonstrated the added value individualized consultation with a registered dietitian familiar with diabetes treatments, along with regular follow-up, has on long-term outcomes and is highly recommended to aid in lifestyle compliance.[5]

TARGET GUIDELINES FOR MACRONUTRIENTS: THE 3 MAJOR COMPONENTS OF DIET

Many studies have been completed to attempt to determine the optimal combination of macronutrients. It appears that overall, the best mix of carbohydrate, protein, and fat depends on the individual metabolic goals and preferences of the person with diabetes. It’s most important to ensure that total calories are kept in mind for weight loss or maintenance. [6]

CARBOHYDRATES: Amount, Type, Nutritive/Non Nutritive Sweetners, and Fiber

The primary goal in the management of diabetes is to achieve as near normal regulation of blood glucose (postprandial and fasting) as possible. The amount and possibly the type of carbohydrate in a food influence overall glucose control. The total amount of carbohydrate (CHO) consumed has the strongest influence on glycemic response. Currently there is inadequate evidence in isocaloric comparison recommending a specific amount of carbohydrates for people with diabetes.[7] The majority of persons with type 1 or type 2 diabetes in the U.S. report eating moderate amounts of carbohydrate (~45% of total energy intake). [8] Monitoring total grams of carbohydrate, whether by use of experienced based estimation or carbohydrate counting, can be useful tools in achieving good glycemic control, especially for patients with type 1 diabetes. The ADA recommends the following: [9]

  • For good health, carbohydrate intake from vegetables, fruits, whole grains, legumes, and dairy products should be advised over intake from other carbohydrate sources, especially those that contain added fats, sugars, or sodium.

  • Monitoring carbohydrate, whether by carbohydrate counting, or experience-based estimation remains a key strategy in achieving glycemic control.

  • Substituting low–glycemic load foods for higher–glycemic load foods may modestly improve glycemic control. While substituting sucrose-containing foods for isocaloric amounts of other carbohydrates may have similar blood glucose effects, consumption should be minimized to avoid displacing nutrient dense food choices.

  • People with diabetes should consume at least the amount of fiber and whole grains recommended for the general public.

  • Use of nonnutritive sweeteners (NNSs) has the potential to reduce overall calorie and carbohydrate intake if substituted for caloric sweeteners without compensation by intake of additional calories from other food.

Nutritive Sweeteners


Sucrose

, also known as “table sugar” is a disaccharide composed of one glucose and one fructose molecule and provides 4 kcals/gm.

Available evidence from clinical studies shows dietary sucrose has no more effect on glycemia than equivalent caloric amounts of starch. It’s important to note that excess energy intake from nutritive sweeteners or foods and beverages containing high amounts of nutritive sweeteners should be avoided, since they provide “empty” calories and can lead to weight gain. [9]


Fructose

is a common naturally occurring monosaccharide found in fruits, some vegetables and honey. High fructose corn syrup is high in processed fructose and is used abundantly in processed foods as a less expensive alternative to sucrose.

  • Fructose consumed as “free fructose” (i.e., naturally occurring in foods such as fruit) may result in better glycemic control compared with isocaloric intake of sucrose or starch , and free fructose is not likely to have detrimental effects on triglycerides as long as intake is not excessive (12% energy).

  • People with diabetes should limit or avoid intake of sugar-sweetened beverages (SSBs) (from any caloric sweetener including high-fructose corn syrup and sucrose) to reduce risk for weight gain and worsening of cardiometabolic risk profile.

A recent meta-analysis of 18 controlled feeding trials in people with diabetes compared the impact of fructose with other sources of carbohydrate on glycemic control. The analysis found that an isocaloric exchange of fructose for carbohydrates did not significantly affect fasting glucose or insulin and reduced glycated blood proteins in these trials of less than 12 weeks duration, a potential limitation of the studies.[10] Strong evidence exists that consuming high levels of fructose-containing beverages may have particularly adverse effects on selective deposition of ectopic and visceral fat, lipid metabolism, blood pressure, and insulin sensitivity compared with glucose-sweetened beverages. [11]Thus, recommendations about the optimal amount of dietary fructose remain controversial due to potential metabolic consequences that could lead to further insulin resistance and obesity.

Non-nutritive Sweeteners

Non-nutritive sweeteners provide insignificant amounts of energy and elicit a sweet sensation without increasing blood glucose or insulin concentrations. There are currently seven non-nutritive, FDA-approved sweeteners found to be safe when consumed within FDA acceptable daily intake amounts (ADI).[12]

  1. Sucralose (Splenda) is synthesized from regular sucrose, but altered such that it is not absorbed. Sucralose is 600 times sweeter than sucrose. It is heat stable and can be used in cooking. It was approved for use by the FDA in 1999

  2. Saccharine (Sugar Twin, Sweet ‘N Low) is 200 to 700 times sweeter than sugar. A cancer-related warning label was removed in 2000 after the FDA determined that it was generally safe.

  3. Acesulfame K (Ace K, Sunette) is 200 times sweeter than sucrose. It can be used in cooking. The bitter aftertaste of acesulfame can be greatly decreased or eliminated by combining acesulfame with another sweetener. [

  4. Neotame is a derivative of the dipeptide phenylalanine and aspartic acid. It is 7,000-13,000 times sweeter than sucrose and does not have a significant effect on fasting glucose or insulin levels in patients with type 2 diabetes.

  5. Stevia (Truvia) derived from the plant

    stevia rebaudiana

    , is a non-caloric, natural sweetener. Stevia has been used as a sweetener and as a medicinal herb since ancient times and appears to be well-tolerated. t has an intensely sweet taste. Five randomized controlled trials showed minimal effects on blood glucose, insulin, blood pressure or weight.

  6. Luo han guo is the most recently approved GRAS generally recognized as safe) sweetener. It is also known as monk fruit or Swingle fruit extract. It is 150-300 times sweeter than sucrose, and may have an aftertaste at high levels.

Sugar alcohols (polyols)

Polyols are hydrogenated monosaccharides, and include such sugars as sorbitol, mannitol, erythritol, xylitol and D-tagatose as well as the hydrogenated disaccharides isomalt, maltitol, lactitol and.trehalose. The polysaccharide derived hydrogenated starch hydrolysates [HSH] are also included in this category. Polyols are used as sweeteners and bulking agents, and designated GRAS by the FDA. Polyols are only partially absorbed from the small intestine, allowing for the claim of reduced energy per gram. Polyols contain, on average, 2 kcals/gm, or 1/2 the calories of other nutritive sweeteners. Studies of subjects with and without diabetes have shown that sugar alcohols cause less of a postprandial glucose response than sucrose or glucose.[12]However, polyols can cause diarrhea at ≥20 gms especially in children. Although a diet high in polyols could reduce overall energy intake or provide long-term improvement in glucose control in diabetes, such studies have yet to be done.

Fiber

  • People with diabetes should consume at least the amount of fiber and whole grains recommended for the general public.

The definition and understanding of fiber has changed in past years.

Dietary fiber i

s defined as the carbohydrate and lignin found in plants that is not digested by the stomach or absorbed in the GI tract.

Functional fiber

is the portion of fiber attributed to have beneficial physiologic effects in humans.

Total fiber

is the sum of both dietary and functional fiberAlthough solubility of fiber was thought to determine physiological effect, more recent studies suggest that other properties of fiber, such as fermentability or viscosity may be more important. [13] Intake of dietary fiber is associated with lower all-cause mortality in people with diabetes [14]. A fiber rich meal is processed more slowly, which promotes early satiety, may be less caloric, lower in fat and added sugars, which can help combat obesity and also may prevent risk of heart disease and colon cancer.[15] The Dietary Guidelines for Americans, 2010, advocates consumption of 14 g dietary fiber per 1,000 calories consumed, or an average of 25 grams for adult women and 38 grams for adult men. This recommendation is based on epidemiologic studies showing protection against cardiovascular disease.[16] The mean intake of dietary fiber in the United States in 2009-2010 ranged from only 11-19 g/day. Fiber supplements and bulk laxatives are used frequently as additional dietary fiber sources, but since few fiber supplements have been studied for physiological effectiveness, the best advice is to consume fiber from foods. [17] A recently published systematic review of the literature concluded that the consumption of whole grains was not associated with significant improvements in glycemic control in individuals with type 2 diabetes; however, it may have other benefits, such as reductions in systemic inflammation.[18]

As with the general population, individuals with diabetes should consume

at least half of all grains as whole grains. High fiber containing carbohydrate sources (>5g/serving) include legumes, whole grain breads and cereals, whole fruits and vegetables and should be included as part of the daily carbohydrate intake. The goal of 25-35 gms of daily fiber intake may be difficult to achieve for some people, as large amounts of fiber can cause negative GI effects, such as bloating and gas. If the patient is not accustomed to larger amounts of fiber in their diet, it should be added slowly.

The websites below contain links to a comprehensive table listing fiber content of foods, and a calculator to help select foods with higher fiber content to help reach daily fiber goals.

http://fnic.nal.usda.gov/consumers/eatinghealth/fiber [19]


http://www.webmd.com/diet/healthtool-fiber-meter

[20]

Resistant starches and Fructans

Resistant starches are starch enclosed within intact cell walls. These include some legumes, starch granules in raw potato, retrograde amylose from plants modified to increase amylose content, or high-amylose containing foods, such as specially formulated cornstarch, which are not digested and absorbed as glucose. Resistant starches are completely fermented in the colon. [It has been proposed that resistant starches may affect postprandial glucose response, reducing hypo and hyperglycemia. However, there are no published long-term studies in subjects with diabetes to prove benefit from the use of resistant starch.[21]

Fructans are an indigestible fiber that has been suggested to have a glucose-lowering effect. Inulin is a fructan commonly added to many processed foods in the form of chicory root. Currently there are no published long-term studies in subjects with diabetes to prove glucose lowering benefit from the use of fructans [21].

Practical Tips on CHO Intake

  • Include a good source of fiber containing food with every meal or snack.

  • Start the day with some whole grains

    .

    Hot cereals – Old-fashioned or steel-cut oats. Cold cereals – Look for those that list whole wheat, whole oats, or other whole grain first on the ingredient list without added sugars

  • Use whole grain breads for lunch or snacks

    .

    Check the label to make sure that whole wheat or another whole grain is the first ingredient listed.

  • Eat less potatoes

    .

    Instead, try brown rice or less well known grains like bulgur, wheat berries, millet, or hulled barley or quinoa.

  • Switch to whole grain pasta. If the whole grain products are too chewy, look for those that are made with half whole-wheat flour and half white flour.

  • Include beans/legumes which are an excellent source of slowly digested carbohydrate as well as a great source of lean protein. Substitute for meat 1-2 times per week.

  • Strive to include a variety of fresh fruits and vegetables in meals every day.

FAT

  • Evidence is inconclusive for an ideal amount of total fat intake for people with diabetes; therefore goals should be individualized; fat quality appears to be far more important than quantity.

Due to the high risk of CVD (cardiovascular disease) in individuals diagnosed with diabetes, the goal for dietary fat intake (amount and type) for patients with diabetes is similar to that of patients with CVD but without diabetes. Recent studies have found that decreasing the amount of saturated fatty acids and trans fatty acids, the principal dietary fatty acids linked to elevating LDL cholesterol, reduces the risk of CVD.[22] The American Heart Association, and American Diabetes Association currently recommend limiting the amount of dietary saturated and trans fat intake.[23,24] Recommendations from the Institute of Medicine and the Academy of Nutrition and Dietetics for healthy individuals are that 20% to 35% of total calories should come from fat.[25,26] Currently, limited research on recommendations on percent of total calories coming from fat exists for individuals with diabetes.[27]

The 2013 Standards of Medical Care for Diabetes from the American Diabetes Association recommends that: [28]

  • Saturated fat intake should be less than or equal to 7% of total calories.

  • Reducing intake of trans fat lowers LDL cholesterol and increases HDL cholesterol, therefore intake of trans fat should be minimized.

The American Heart Association has developed the

Meet the Fats

campaign to help individuals learn more about healthy vs unhealthy fats. Among the campaign’s top priorities is to encourage replacing high trans fat partially hydrogenated vegetable oils, animal fats and tropical oils with healthier oils and foods higher in unsaturated fats — monounsaturated and polyunsaturated.[29]

Monounsaturated Fatty Acids

  • In people with type 2 diabetes, a Mediterranean-style, monounsaturated fatty acid (MUFA)-rich eating pattern may benefit glycemic control and CVD risk factors and can, therefore, be recommended as an effective alternative to a lower-fat, higher-carbohydrate eating pattern.

Monounsaturated fats (MUFA) are typically found in vegetable oils such as olive, peanut, and canola oil and remain liquid at low temperatures. Foods high in MUFA include avocado, fatty fish, and nuts and nut butters. Several large prospective observational studies have documented that diets rich in MUFA are associated with a reduced risk of CVD. Recently, the Evidence Analysis Library of the Academy of Nutrition and Dietetics discovered that a 5% energy replacement of saturated fatty acid (SFA) with MUFA improves insulin responsiveness in insulin-resistant and type 2 diabetic subjects [30,31]

Polyunsaturated Fatty Acids

Polyunsaturated fats are usually liquid at room temperature, and are found in vegetable oils such as corn oil, safflower oil, and soybean oil. There is limited evidence in people with diabetes on the positive effects of omega-6 polyunsaturated fatty acids (PUFAs). Controversy exists on the best ratio of omega-6 to omega-3 fatty acids; PUFAs and MUFAs are recommended substitutes for saturated or trans fat. [32]

Omega-3 Fatty Acids

  • Evidence does not support recommending omega-3 (EPA and DHA) supplements for people with diabetes for the prevention or treatment of cardiovascular events.

  • As recommended for the general public, an increase in foods containing long-chain omega-3 fatty acids (EPA and DHA) (from fatty fish) and omega-3 linolenic acid (ALA) is recommended for individuals with diabetes because of their beneficial effects on lipoproteins, prevention of heart disease, and associations with positive health outcomes in observational studies.

  • The recommendation for the general public to eat fish (particularly fatty fish) at least two times (two servings) per week is also appropriate for people with diabetes.

Some types of fatty fish contain unique polyunsaturated fats called omega-3 fatty acids, one of the most studied areas in nutrition science. The consumption of 2 servings (8 ounces) per week of fish high in EPA and DHA is associated with a reduced risk of both sudden death and death from coronary artery disease in healthy adults. [33] Studies on the effect of omega-3 fatty acids (both from food and supplements) in persons with diabetes have been inconclusive.[34] In addition to providing EPA and DHA, regular fish consumption may help by replacing other foods higher in saturated and trans fats from the diet, such as fatty meats and full-fat dairy products. Preparing fish without frying or adding cream based sauces is recommended. Fish with high amounts of omega-3 include salmon, albacore tuna, mackerel, sardines, herring and rainbow trout.

Saturated Fats

  • The amount of dietary saturated fat, cholesterol, and trans fat recommended for people with diabetes is the same as that recommended for the general population.

Saturated fats are usually solid or almost solid at room temperature. All animal fats, such as those in meat, poultry, and dairy products, are saturated. Processed and fast foods contain high amounts of saturated fats. Vegetable oils also can be saturated, and include palm, palm kernel and coconut oils.

Few research studies have been undertaken to look at the difference between the amount of SFA in the diet and glycemic control and CVD risk in people with diabetes. The ADA nutrition position paper recommends people with diabetes follow the guidelines for the general population. The Dietary Guidelines for Americans, 2010 recommends consuming less than 10% of calories from SFAs to reduce CVD risk.[34]

In general, saturated fats are discouraged because they increase LDL-cholesterol and total cholesterol concentrations. Diets high in saturated fats have been implicated in an increased risk of cardiovascular disease. Three randomized controlled trials found that diets containing ≥7% SFA and ≥200 mg/day cholesterol reduced LDL cholesterol level from 9% to 12% compared to baseline values or to a more standard Western-type diet. [35] Therefore, people with diabetes should strive to limit saturated fat intake to between 7-10% of total calories.

Trans Fats

Trans fatty acids (TFA) are also called hydrogenated fats, which are fats created when oils are “partially hydrogenated”. The process of hydrogenation changes the chemical structure of unsaturated fats by adding hydrogen atoms, or “saturating” the fat. Hydrogenation converts liquid oil into stick margarine or shortening. Manufacturers use hydrogenation to increase product stability and shelf-life. Thus, a larger quantity can be produced at one time, saving manufacturing costs. Research studies show that synthetic TFA can increase LDL cholesterol and lower HDL cholesterol. With the mandatory TFA labeling in 2006, a big push has been made by food manufacturers to remove it from processed and baked goods. Although the TFA content in foods has decreased recently (through food reformulation), it is important to monitor the type of fat used to replace TFA, as it might be saturated fat. Also, the FDA recently determined that trans fats are no longer considered generally recognized as safe (GRAS)[36]

Table 1

DIETARY FATS


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Type of Fat

Main Source

Monounsaturated

Canola, peanut, and olive oils; avocados; nuts such as almonds, hazelnuts, and pecans; and seeds such as pumpkin and sesame seeds.

Polyunsaturated

Sunflower, corn, soybean, and flaxseed oils, and also in foods such as walnuts, flax seeds, and fish.

Saturated

Whole milk, butter, cheese, and ice cream; red meat; chocolate; coconuts, coconut milk, and coconut oil

Trans

Some margarines; vegetable shortening; partially hydrogenated vegetable oil; deep-fried foods; many fast foods; some commercial baked goods (check labels)

Stanols and Sterols

  • Individuals with diabetes and dyslipidemia may be able to modestly reduce total and LDL cholesterol by consuming 1.6–3 g/day of plant stanols or sterols typically found in enriched foods

Plant sterols are naturally occurring cholesterol derivatives from vegetable oils, nuts, corn, woods and beans. Hydrogenation of sterols produces stanols. The generic term to describe both sterols, stanols and their esters is phytosterols. An important role of phytosterols is their ability to block absorption of dietary and biliary cholesterol from the gastrointestinal tract. The LDL lowering property of both sterols and stanols is considered equivalent in short term studies.[36] The amounts of sterols and stanol esters found naturally in a normal diet are insufficient to have a therapeutic effect. Thus, many manufacturers add them to various foods for their LDL cholesterol lowering effects. You can find added phytosterols in margarine spreads, juices, yogurts, cereals, and even granola bars.

A recent meta-analysis reviewing well controlled studies found that the short-term use of food supplements high in plant sterols is a safe and effective strategy to help maximize the benefits of dietary and lifestyle treatment, either with or without statin therapy, among the majority of dyslipidemic patients with a need for further lipid-lowering. Products that contain plant sterols can help reduce LDL cholesterol by more than 10 percent. The amount of daily plant sterols needed for results is at least 2 grams — which equals about two 8-ounce (237-milliliter) servings of plant sterol-fortified orange juice a day. [36

]

The evidence on long term use and in people with diabetes is less substantiated, as not many studies have been completed.[37,38] The EAL from the Academy of Nutrition and Dietetics advocates use of plant sterol/stanol esters in amounts of 2 g/day, which equates to approximately 2 tablespoons/day as part of a cardioprotective diet.[39] The taste of these fortified margarines is comparable to regular margarine, but they cost 3-4 times more than regular spreads. It is also important to keep in mind that these fortified foods should be used as a substitute for regular foods, not as an additive, as more is not better and will provide extra calories which can lead to weight gain

.

Practical Tips on Fat Intake

  • Try to eliminate trans fats from partially hydrogenated oils. Check food labels for trans fats; limit fried fast foods.

  • Limit intake of saturated fats by cutting back on processed and fast foods, red meat and full-fat dairy foods. Try replacing red meat with beans, nuts, skinless poultry, and fish whenever possible, and switching from whole milk and other full-fat dairy foods to lower fat or preferably non-fat versions.

  • In place of butter or margarine, use liquid vegetable oils rich in polyunsaturated and monounsaturated fats in cooking and at the table.

  • Eat one or more good sources of omega-3 fats every day—fish, walnuts, canola or soybean oil, ground flax seeds or flaxseed oil

PROTEIN

The 2013 ADA Nutrition therapy recommendations for adults with diabetes position statement states the following: [40]

  • For individuals with diabetes and no evidence of diabetic kidney disease, evidence is inconclusive to recommend an ideal amount of protein intake for optimizing glycemic control or improving one or more CVD risk measures; therefore, goals should be individualized. For people with diabetes and diabetic kidney disease (either micro- or macroalbuminuria), reducing the amount of dietary protein below usual intake is not recommended because it does not alter glycemic measures, cardiovascular risk measures, or the course of GFR decline.

  • In individuals with type 2 diabetes, ingested protein can increase insulin response without increasing plasma glucose concentrations. Therefore, carbohydrate sources high in protein should not be used to treat or prevent hypoglycemia.

The statement above regarding not reducing dietary protein intake in patients with varying stages of nephropathy is a change from previous recommendations. This is based on several RCTs and two recent meta-analyses that have not shown improvements in renal parameters with restriction of dietary protein. The ADA Standard of Medical Care in Diabetes-2103 states that dietary protein restriction might be considered particularly in patients whose nephropathy seems to be progressing despite optimal glucose and blood pressure control and use of ACE inhibitor and/or ARBs [41]. The National Kidney Foundation recommends 0.8 g protein/ kg body weight for people with diabetes and stages 1–4 chronic kidney disease as a means of reducing albuminuria and stabilizing kidney function .The Joslin Diabetes Center, advocates a protein intake of 20–30% of total energy intake or not less than 1.2 g / kg ideal body weight for individuals with type 2 diabetes. This is in line with the average Amercan intake of 1-1.5 g/kg/day of protein. [42[

There is no strong evidence to suggest benefit from plant protein over animal protein, however high biologic value sources of protein such as meat, poultry, fish, milk products, eggs and soy, which contain all 9 essential amino acids should be emphasized, to make up 50-75% of protein consumed. [43]

Further research is still needed to define the optimal macronutrient content for fat (SFA, TFA, UFA), protein, and carbohydrate to attain the most beneficial lipid and lipoprotein profile in the general population and in patients with diabetes at increased risk for CVD.

TARGET GUIDELINES FOR MICRONUTRIENTS

  • There is no clear evidence of benefit from vitamin or mineral supplementation in people with diabetes who do not have underlying deficiencies.

  • Routine supplementation with antioxidants, such as vitamins E and C and carotene, is not advised because of lack of evidence of efficacy and concern related to long-term safety.

  • There is insufficient evidence to support the routine use of micronutrients such as chromium, magnesium, and vitamin D to improve glycemic control in people with diabetes.

  • It is recommended that individualized meal planning should include optimization of food choices to meet recommended dietary allowance (RDA)/dietary reference intake (DRI) for all micronutrients.

In patients with diabetes who have no underlying deficiencies, there is no clear evidence of benefit from vitamin or mineral supplements. People with diabetes should be aware of the necessity for meeting vitamin and mineral needs from natural food sources through intake of a balanced diet. . Specific populations, such as the elderly, pregnant or lactating women, strict vegetarians or vegans, and patients on calorie-restricted diets may benefit from a multivitamin mineral supplement [44], although excessive doses of certain vitamin or mineral supplements when there is no deficiency has been shown to be of no benefit and may even be harmful.

VITAMINS

Since diabetes is a state of increased oxidative stress, interest in recommending large doses of antioxidant vitamins has been high. Current studies demonstrate no benefit of carotene and Vitamin E in respect to improved glycemic control or treatment of complications. Routinely supplementing the diet with antioxidant supplements is not recommended due to lack of evidence showing benefit in large, placebo-controlled clinical trials and concerns regarding potential long-term safety. [44]

Vitamin D

Vitamin D supplementation has also garnered recent interest due to some positive findings from observational studies. However, data pooled from vitamin D intervention trials is conflicting and lack conclusive evidence in support of routine vitamin D supplementation related to changes in diabetes risk or measures of glucose homeostasis. [44,45]

MINERALS

Sodium

  • The recommendation for the general population to reduce sodium to less than 2,300 mg/day is also appropriate for people with diabetes.

  • For individuals with both diabetes and hypertension, further reduction in sodium intake should be individualized.

Since few studies have been undertaken on sodium restriction in people with diabetes, the 2013 ADA nutrition therapy guidelines recommendation is to follow the guidelines for sodium intake for the general population. In hypertensive, salt-sensitive individuals, reduced sodium intake to 1500 mg can lower blood pressure. Food manufacturers and restaurants will need to provide additional reduced sodium alternatives to help accomplish this goal [46] According to the 2013 ADA standards of medical care, the sodium intake recommendation is <1500 mg per day, which will be difficult for many patients to accomplish. It will require not adding salt to foods during cooking or at the table, as well as avoidance of consumption of most pre-prepared and pre-packaged foods. [47] Some recent evidence in people with type 1 and type 2 diabetes measuring urine sodium excretion has actually shown increased mortality associated with very low sodium intakes, potentially requiring caution for universal sodium restriction to 1,500 mg in the diabetes population without hypertension.[48] The 2013 standards also list other lifestyle modifications, including loss of excess body weight; increasing consumption of fruits and vegetables (8 –10 servings/day), and low-fat dairy products (2–3 servings/day); avoiding excessive alcohol consumption (no more than 2 servings/day in men and no more than 1 serving/day in women); and increasing activity levels. These nonpharmacological strategies may also positively affect glycemia and lipid control. [49]. The DASH (Dietary Approaches to Stop Hypertension) diet, which is high in fruit and vegetables, low-fat dairy products, and low in saturated and total fat; has been shown in large, randomized, controlled trials to significantly reduce blood pressure. [50] The DASH diet was rated best overall and best diet for diabetes in a recent report published in US News and World Report. The report was based on scores of 35 diets rated by nutrition and diet, diabetes and cardiac experts.[51]

Magnesium

Studies in support of magnesium supplementation to improve glycemic control are unclear and complicated by differences in study designs as well as base line characteristics. [52]There is some evidence that higher dietary intake of magnesium may help prevent type 2 diabetes in both men and women at higher risk for developing the disease. [53] Additional long term studies are needed. Dietary sources of magnesium include nuts, whole grains, and green leafy vegetables.

Chromium

Several studies have demonstrated a potential role for chromium supplementation in the management of insulin resistance and type 2 diabetes,. According to the ADA position statement, the findings with more significant effects were mainly found in poorer quality studies, limiting transferability of the results. Routine supplementation of chromium is therefore currently not recommended for treating diabetes or obesity. [54].

CINNAMON AND HERBAL SUPPLEMENTS

There has been interest in the past several years on the effect of cinnamon in individuals with diabetes. The most recent ADA position statement concludes that after a review of the evidence, there is not enough clear data to substantiate recommending the use of cinnamon. The paper goes on to say that the use of any herbal supplements, which are not regulated and vary in content, may provide more risk than benefit, in that herbs may interact with other medications that are taken to control diabetes.[54]

ALCOHOL

  • If adults with diabetes choose to drink alcohol, they should be advised to do so in moderation (one drink per day or less for adult women and two drinks per day or less for adult men).

  • Alcohol consumption may place people with diabetes at increased risk for delayed hypoglycemia, especially if taking insulin or insulin secretagogues. Education and awareness regarding the recognition and management of delayed hypoglycemia is warranted.

The ADA position paper states that moderate alcohol consumption has minimal detrimental short or long term effects on blood glucose in people with diabetes, with some epidemiologic data showing improved glycemic control with moderate intake. Moderate intake may also contribute to cardiovascular risk reduction and mortality benefits in people with diabetes, no matter the type of alcohol. Thus, the recommendations for alcohol consumption for people with diabetes are the same as for the general population [54]

Alcohol intake greater than in moderation can lead to hypoglycemia through several mechanisms, including the inability of alcohol to be converted into glucose, the inhibitory effect of alcohol on gluconeogenesis, and its interference in normal counter regulatory hormonal responses to impending hypoglycemia. However, one drink for women and two drinks for men per day can usually be incorporated into the diet for patients with type 1 diabetes with no major effect on blood glucose. One drink is defined as 12 oz beer, 5 oz wine or 1.5 oz of hard liquor. To decrease the risk of hypoglycemia, it is best to have the alcohol with food. Consuming alcohol in a fasting state may contribute to hypoglycemia in patients with type 1 diabetes. Symptoms of hypoglycemia can be similar to drunkenness, so advise others that the person has diabetes so proper treatment for hypoglycemia can be undertaken. When calculating the need for meal related boluses of insulin, one should account for the carbohydrate content of the alcohol if drinking sweet wines, liqueurs, or drinks made with regular juice or soda. Selecting dry wine, light beer or hard liquor made with noncaloric mixers is preferable.[55]

PUTTING IT ALL TOGETHER- FOR TYPE 1 PATIENTS AND PATIENTS ON INSULIN

CARBOHYDRATE COUNTING

Both the amount and type of carbohydrate (CHO) in food can influence blood glucose levels. Monitoring carbohydrate, whether by carbohydrate counting, exchanges or experienced-based estimation, remain an important strategy used in improving glycemic control. [54] CHO counting is based on the concept that each serving of CHO equals approximately 15 gms of CHO. The average person needs about 3 to 4 choices (45-60 gms) of CHO at each meal. This number could vary more or less depending on calorie needs (i.e., pregnant/nursing, ill, etc.), medication, and activity. Carbohydrate counting is routinely taught to motivated patients with diabetes, so that they can more easily estimate the amount (grams) of CHO in a particular food. Furthermore, setting CHO counting goals for each meal allows the patient to more easily match their CHO intake to the appropriate mealtime insulin dose. Potential advantages of CHO counting include improved glucose control, flexibility in food choices, and simplification of meal planning. Disadvantages include weight gain, unhealthy eating, hypoglycemia and high lipid levels. There are no evidence-based studies showing superiority over other dietary management methods, and CHO counting requires motivation on the patient’s part.[56]

A good online resource for basic carbohydrate counting can be found on the UCSF website:

http://dtc.ucsf.edu/living-with-diabetes/diet-and-nutrition/understanding-carbohydrates/counting-carbohydrates/[57]

GLYCEMIC INDEX (GI) AND LOAD (GL)

  • Substituting low–glycemic load foods for higher–glycemic load foods may modestly improve glycemic control

The use of the glycemic index (a scale that ranks carbohydrate rich foods by how much they raise blood glucose levels) has been developed to identify and classify over 600 foods and their blood glucose raising potential. It has been demonstrated that high fiber, low GI foods can help delay the absorption of glucose into the bloodstream, consequently helping to control blood glucose levels. As a general rule, refined grain products and potatoes have a higher GI, legumes and whole grains have a moderate GI, and non-starchy fruits and vegetables have a low GI. Many factors can influence the GI of a food, such as methods of cooking, physical state of a food, and how much fat and protein are consumed in conjunction with that food. [58] The ADA states use of the glycemic index and glycemic load may provide a modest additional benefit

for glycemic control over that observed when total carbohydrate is considered alone. The reasoning behind a less than robust recommendation is that the literature on GI and GL in individuals with diabetes is complex, and it is often difficult to separate the independent effect of fiber compared with that of the GI on glycemic control and other outcomes. Other organizations more highly advocate it’s use, including the Diabetes and Nutrition Study Group (DNSG) of the European Association and the [Diabetes UK Nutrition Working Group [59] It is important that persons with diabetes who want to use the GI to better manage their glucose control are taught how specific foods and meals affect their own blood glucose levels, rather than adhering only to the existing GI. For example, a patient could compare a low GI food, such as oatmeal (GI = 50) with cornflakes (GI = 84) to determine the relative effect of each on their own blood glucose.

The basic technique for following low GI guidelines is simply a “this for that” approach – i.e.: replacing high GI foods with low GI foods. One need not count numbers or do any sort of mental arithmetic to make sure they are eating a healthy, low GI diet. Some tips include:

  • Increasing the consumption of whole grains, nuts, legumes, fruit, and non-starchy vegetables

  • Decreasing the consumption of starchy high-glycemic index foods like potatoes, white rice, and white bread

  • Decreasing the consumption of sugary foods like cookies, cakes, candy, and soft-drinks

GLYCEMIC LOAD

The glycemic load (GL) combines the GI and the total CHO content of an average serving of a food. It is defined as the GI multiplied by the amount of carbohydrate per serving of food in grams and dividing the total by 100 It was introduced as a measure of the overall effect of a food on blood glucose and insulin levels. The GL is a more accurate indicator of the relative response to carbohydrate, as .Tit attempts to incorporate both the quality and quantity of CHO consumed. [60]

A 2011 review article on GI and GL in the diabetes diet by Marsh, et al concludes that both the amount and type of carbohydrate are important in predicting glycemic response to a meal. Diets based on low GI carbohydrate containing foods have been associated with a reduced risk of type 2 and CVD, and intervention studies have shown improvements in insulin sensitivity and A1C in those with diabetes. Low GI diets may also assist with weight management through effects on satiety and fuel partitioning. Since no demonstrated negative effects of a low GI diet have been demonstrated, the GI can be an important consideration in the dietary management of diabetes. [61]

SPECIAL CONSIDERATIONS FOR PATIENTS TREATED WITH INTENSIVE INSULIN REGIMENS

The following guidelines are the starting point for the nutritional component of patients on intensified insulin management regimens, usually patients with type 1 diabetes, regardless of what meal plan approach is chosen: [62]

  1. The initial diabetes meal plan should be based on the patient’s normal intake with respect to calories, food choices, and times meals eaten.

  2. Choose an insulin regimen that is compatible with the patient’s normal pattern of meals, sleep and physical activity.

  3. Synchronize insulin with meal times based on the action time of the insulin(s) used.

  4. Monitor blood glucose levels and adjust the insulin doses as needed for usual intake.

  5. Monitor A1C, weight, lipids, blood pressure, and other clinical parameters, modifying the initial meal plan as necessary to meet goals

  6. It is also important for the patient to be consistent with what is eaten and when from day to day

With type 2 diabetes, the emphasis may need to be on making lifestyle changes to rectify metabolic abnormalities and meet weight loss goals to reduce the risk of chronic complications, especially CVD.

CHILDREN AND ADOLESCENTS

While medical nutrition therapy provided by registered dietitians resulted in better glycemic control in children with newly diagnosed type 1 diabetes, a survey of 45 pediatric clinics revealed that only 25 clinics had a pediatric dietitian available for children with diabetes. [63] The goals of children and adolescents with diabetes include the following:

  1. Provide appropriate energy and nutrient intake to ensure optimal growth and development

  2. Promote healthy lifestyle habits while preserving social, cultural and physiological well being

  3. Achieve and maintaining the best possible glycemic control

  4. Achieve and maintaining appropriate body weight and promoting regular exercise

Dietary advice should start gradually:

  1. Emphasis should initially be on establishing supportive rapport with the family with simple instructions. More detailed guidelines should be administered later by the entire team, with focus on consistency in message and should include dietary guidelines to avoid hypoglycemia Nutritional advice needs to be given to all caregivers; teachers, babysitters, extended family, etc.

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