Telemedicine is a good adjunct to conventional healthcare; however, it may be cost-prohibitive for rural physicians
[32][12]. Telemedicine also requires a built environment that supports high-speed internet for patients and physicians, access to smart technology, end-to-end encryption services to maintain secure health data, and possibly large capital investment from the rural physician, as well as staff training and maintenance fees. A common and justified recommendation is that people with diabetes should see a dietitian for Medical Nutrition Therapy (MNT); however, dietitians are either not locally available or may be cost-prohibitive (with a lack of health insurance, or low socioeconomic status). This is complicated by the fact that reimbursement for MNT from Medicare possibly requires it to be performed by a dietitian, per the legal definition of MNT
[14][13]. Creating some form of reimbursement for rural healthcare professionals who provide nutritional support may help the current situation. Another advantage for urban area is the availability, or potential for the creation of, DSMES and Diabetes Prevention Program (DPP) services for people with diabetes. These would include some form of intensive lifestyle intervention for weight loss. These services are well suited to an area with multidisciplinary healthcare teams available, and the capital and human resources needed to develop and maintain these services.
Dietary assessment is a necessary part of MNT; however, the most important resource required is time. All types of dietary assessment (see review in
[27][14]) require specialized software (e.g., Food Processor (ESHA, Salem, OR, USA), MyFood 24 (Nexus, Leeds, UK), and Power Diary (Salt Lake City, UT, USA). All these can perform dietary assessments fully online, where the patient would complete a food diary via an app, and the software would directly provide the results to the physician. Food Processor can have data manually inputted from 24 h recall, or food diaries. Overall, dietary assessment tools are relatively inexpensive; however, time is required to interpret the results and create meal plans or other dietary interventions.
3. Dietary Intakes of People with Diabetes
Before providing some practical nutritional considerations for people with diabetes, it is best to have some idea of what they are consuming. The National Health and Nutrition Examination Survey (NHANES) has dietary intake estimates, based on 24 h dietary recall, for people with diabetes. The limitations and strengths of dietary recall are widely publicized
[33,34][15][16]; however, NHANES data are used to develop the Dietary Guidelines for Americans. While these are estimates based off one day’s food intake, and are mostly based on an urban population, they could act as a reference point for people in rural areas. Overall, people with diabetes were observed as not achieving a good diet quality score (based on the United States Department of Agriculture’s Healthy Eating Index (HEI) score. In addition, compared to individuals without diabetes, people with prediabetes or diabetes, seem to have lower caloric (up to 264 kcal), protein, carbohydrate and fat intakes, of up to approximately 264 kcal. Furthermore, dinner was the largest meal and contained the highest amount of carbohydrate, while snacks contained the most added sugars
[35][17]. For people with diabetes, mean intakes of thiamin, niacin, vitamin B6, vitamin C, magnesium, and potassium were significantly lower compared to those in people without diabetes
[36][18]. Snacks contributed approximately 20% of the daily energy intake for people with prediabetes or diabetes, which was significantly less than that for those without diabetes
[33][15]. People with diabetes who skipped breakfast compensated with snacks, and actually consumed more energy, carbohydrate, and added sugars from snacks compared to those who ate breakfast
[37][19].
4. Initiating Nutritional Therapy in Rural Environments
4.1. Estimating Energy Intake
Estimating energy intake is most important when the objective is weight loss. New estimated energy requirement (EER) equations from the National Academies of Sciences, Engineering, and Medicine are available
[39][20]; they are based on age, sex, physical activity level, and pregnancy/lactation. EER equations can be incorporated into digital records and can be calculated in the physician’s office. The ADA guidelines recommend a target weight loss of 5% to achieve a clinical benefit, with optimal benefits seen with 15% weight loss for patients with diabetes. For people with prediabetes, weight loss should be 7–10% of the body weight to help slow the progression to diabetes
[14][13]. Body weight optimization is fundamental to diabetes management. The ‘3500 kcal rule’ is the typical method utilized to reduce body weight. It assumes 3500 kcal = 1 lb (0.454 kg) of body weight, so a deficit of 3500 kcal over one week (500 kcal/d) should result in a loss of 1 lb of body weight. The 3500 kcal rule has its limitations
[40,41][21][22] because weight loss is not linear, and it probably overestimates the rate of weight loss due to the complex physiological and metabolic factors associated with energy homeostasis. Nevertheless, it does provide a starting point to help facilitate weight loss and requires close monitoring.
An alternative solution is to utilize the MyPlate Plan
[42][23] to estimate energy requirements, which can be easily performed during an office visit, with the aid of office staff. The patient could also complete this at home. This will provide two energy levels: (1) to help achieve a healthy weight and, (2) to maintain body weight. It must be noted that these numbers are estimates and will need to be modified over time, based on the rate of weight gain or loss, and patient perceptions. The key point is that weight management is a journey that requires considerable commitment from both the physician and the patient.
Before leaving the topic of energy intake, malnutrition must be addressed. For older adults, malnutrition (undernutrition) is more prevalent in rural areas
[43][24], which can complicate nutritional therapy. Malnutrition can easily be screened for and assessed using various tools. Nutritional assessment is more involved and leads to a medical diagnosis of malnutrition. It is more common to utilize malnutrition screening and assessment in hospitals and long-term care facilities; however, for the rural physician, regular malnutrition screening could improve patient health outcomes. Malnutrition can have profound effects on homeostasis, organ function, and mood
[44][25]. Screening for malnutrition is rapid, inexpensive and is predominately based on recent unintentional weight loss. Two options for screening are the Malnutrition Universal Screening Tool (MUST) for adults, and the Malnutrition Screening Tool (MST). These instruments are readily available online and consist of three questions each. Answers to these questions are scored, determining if the individual is at risk of malnutrition or not. Those at risk should be then assessed to make a medical diagnosis. Assessments can be subjective and require practice. The two widely utilized recommended instruments for assessment are the Mini Nutrition Assessment
® (MNA; Nestlé Nutrition Institute) and the Subjective Global Assessment (SGA). The MNA has more questions compared to the SGA (18 versus 7); however, both should take less than 15 min to complete. These are readily available online and can be utilized in rural settings.
4.2. Macronutrient Distribution
While “there is no ideal macronutrient pattern for people with diabetes”
[45][26], NHANES data show that people with prediabetes and diabetes have approximately the same macronutrient distribution as that of people with a healthy A1C; 15% of total energy is from protein, 50% of total energy is from carbohydrates; and 35% of total energy is from fat (12% is from saturated fat)
[35][17]. This distribution pattern is relatively close to the U.S. Acceptable Macronutrient Distribution Ranges (AMDR)
[46][27]. Although AMDRs are technically designed for healthy people, they provide a useful frame of reference (for the most part, most patients, with or without diabetes, will be within the AMDR). Some expert bodies have determined evidence-based macronutrient distribution ranges for people with diabetes. The Asociación Latinoamericana de Diabetes (ALAD; Latin American Diabetes Association) brought together medical associations from 17 countries to produce a consensus statement regarding the treatment of type 2 diabetes
[47][28].
4.3. Protein and Fat
When considering protein for rural patients, achieving the RDA could be the minimum goal
[34][16]. Per ADA guidelines
[14][13], lean fresh meats (the fat in red meat is high in stearic acid, an 18-carbon saturated fatty acid, which is associated with cardiovascular disease
[52][29]), and a mixture of protein sources—plants and animal proteins are recommended. Soy protein and animal proteins, including dairy, seafood and eggs, are all of high biological value. Eggs may be more readily available in rural areas; however, overconsuming eggs should be limited for those with diabetes
[53][30]. Consuming more egg whites, than whole eggs, could be encouraged, to increase good-quality protein intake, as the cholesterol is in the yolk.
4.4. Carbohydrate
The most important macronutrient in relation to diabetes is carbohydrate, with and emphasis on carbohydrate quality
[34][16]. This includes making more whole grain choices and limiting refined carbohydrates, especially from ultraprocessed foods and snacks. Nutritional intervention is a key component of diabetes management, along with medications and other lifestyle changes. One key point is that people with diabetes need reminding that glycemic medications perform specific functions to address hyperglycemia. However, poor- quality dietary carbohydrate will still raise blood sugar, independent of most medications. The primary exception are α-glucosidase inhibitors, which can reduce the amount of carbohydrate digested (not 100% effectively), although simple sugars (i.e., monosaccharides such as glucose and fructose) will still become absorbed;
[57][31], see
Figure 21.
Figure 21. Foods, especially refined carbohydrates, have the greatest effect on blood glucose. This figure is adapted from
[58][32] and summarizes the primary actions of common diabetes medications; however, not all known actions are depicted. Medications target specific actions to manage blood glucose; however, regardless of the medication used, the wrong foods will raise blood glucose. This results in postprandial glucose spikes, which contribute to a higher A1C
[51][33]. The yellow box depicts what contributes to blood glucose and the blue box shows how medications manage physiological mechanisms; however, food still greatly contributes to blood glucose. DPP-4 = dipeptidyl peptidase 4 (gliptins); GLP-1 = glucagon-like peptide-1; SGLT-2 = sodium glucose cotransporter 2.
4.5. Water
Water is the other, often overlooked, macronutrient
[59][34]. A recent meta-analysis associates higher water intake with a reduced risk of type 2 diabetes
[60][35]. However, hydration is not reviewed in the ADA guidelines
[14][13]. Maintaining good hydration status in people with diabetes has many metabolic benefits
[61][36]. People with diabetes may be at higher risk of dehydration due to hyperglycemia and its associated increased urinary output. In addition, underhydration may increase hyperglycemia
[62][37] and contribute to diabetic ketoacidosis in children and adolescents
[63][38], and adults with type 1 diabetes
[64][39]. Water intake recommendations for healthy people (Adequate Intakes) are 3.7 L and 2.7 L per day for men and women, respectively
[65][40], with adjustments made for activity level and age (older people tend to drink less so are at a higher risk for dehydration
[66][41]).
4.6. Micronutrients
The ADA guidelines do not support the use of supplementary vitamins and minerals, specifically to help control blood glucose or improve CVD risk factors
[14][13]. The default target intakes for the micronutrients are the Dietary Reference Intakes; all the tables are freely available here
[73][42]. Patients with diabetes on metformin should be monitored for B
12 deficiency at least annually
[14][13]. Epidemiological studies suggest that lower potassium, magnesium, and zinc status are associated with uncontrolled diabetes
[74][43], and may be worth monitoring. Chromium may not help with blood sugar management
[14][13], although some studies do support it use
[74][43]. However, it is important to know what supplements the patient is taking. Maintaining a non-judgmental approach to micronutrient supplements and herbals will help gain patient trust and facilitate the open sharing of information. The major reason to ask a patient to stop taking a supplement is if it contraindicated for any aspect of their medical treatment (e.g., nutrient–drug interactions). Overall, as there is not strong evidence to support the use of certain micronutrients and herbs/spices specifically for glycemic control, the patient’s money may be best spent on other means to control glycemia.
4.7. Non-Nutritive Sweeteners
The original goal of non-nutritive sweeteners was to reduce calories and avoid blood sugar spikes. Regardless, it is logical to assume that the use of non-nutritive sweeteners does not break the sweet habit
[75][44]. While low-/non-caloric sweeteners do reduce the overall energy intake of a patient, they may not improve glycemic outcomes
[76,77][45][46] as they may disrupt the patient’s insulin sensitivity
[78][47]. Diet sodas that contain aspartame have been associated with higher A1C levels and higher risks of metabolic syndrome
[79][48]. This could be that individual’s pair higher-calorie and carbohydrate foods with low-calorie/zero-calorie beverages.
4.8. Alcohol
Moderate alcohol consumption is recommended for people with diabetes, and equates to approximately one drink per day. One drink is defined as a 12 oz of beer, a 5 oz glass of wine, or 1.5 oz of distilled spirits (approx. 15 g alcohol)
[14][13]. However, one additional consideration is the carbohydrate/sugar content of different alcoholic drinks; that of beers is the highest and that of distilled spirits is the lowest; low-carb beers are available. It is also important to educate people with diabetes about the signs, symptoms, and self-management of delayed hypoglycemia after drinking alcohol, especially when using insulin or insulin secretagogues.
4.9. Dietary Patterns/Quality
The ADA guidelines state that a variety of eating patterns are suitable for people with diabetes
[14][13]. Improving diet quality means increasing the consumption of plant foods and whole foods, in addition to reducing processed food intake. There is considerable flexibility for the rural physician within the ADA guidelines to modify patients’ dietary patterns. The core concept is to improve carbohydrate quality (more whole grains and less refined grains) to help improve glycemia. Rural physicians must assess what foods the patient has access to and suggest an eating pattern that works best with their situation
[21][8].
Most people are aware of the Mediterranean diet and a low-fat diet; however, one dietary pattern that is receiving more attention is the very-low-carbohydrate diet. This is typically referred to as the ketogenic diet, and it is defined as maintaining a state of nutritional ketogenesis (a blood ketone level between 0.5 and 4.0 mM), by limiting the daily intake of carbohydrates to 20–50 g/d and that of protein to 1.5 g/kg of body weight, with the remainder of energy coming from fats
[83][49]. While this diet is appropriate for some patients with diabetes (uncontrolled diabetes or requiring medication reduction), it requires time and resources to remain compliant, including monitoring blood and/or urinary ketones.
5. Cultural Preferences
Cultural preferences are a vital component when providing dietary advice. Cultural preferences are not directly addressed in the ADA guidelines
[14][13]; however, they come into play when creating an individualized diet. For example, African American diets often have starchy vegetables (white and sweet potatoes) as a staple food
[84][50]. Starchy vegetables should be limited as they contribute to higher postprandial blood glucose
[14][13]. In this case, a good starting point may be to reduce the serving size. Substitutes include pinto, kidney, or navy beans. Patients could also be encouraged to embrace the diversity of traditional vegetables in their diets, such as green leafy vegetables such as collard, mustard, or spinach greens
[84][50], if available. Understanding the value of traditional foods in an individual’s life is a core component of culturally competent nutritional recommendations, which can play a huge role in patient compliance and overall improved health. Recommending foods outside of the patients’ cultural preferences has been shown to lead to cultural disconnection, which in turn can lead to decreased adherence to recommended diet plans, and the possible loss of social support
[85][51].
6. Summary
Nutritional guidelines for prediabetes and diabetes from expert societies are excellent resources; however, their utility may diminish in medical/food deserts. This represents a large gap in rural patient management as well as the gap in the literature related to dietary habits, dietary behaviors, and cultural preferences of people with diabetes in rural America.
Table 1 summarizes the barriers to fully implementing nutritional guidelines, including DSMES, DPP, and intensive lifestyle interventions that have been shown to be effective. In rural areas, these programs are either not available or are cost-prohibitive to create locally. However, because of the complexity of the nutritional therapy required, certain groups are at a higher risk for complications in rural areas due to food and/or healthcare insecurity; these are those with eating disorders and other conditions (diabetes-related gastroparesis and chronic kidney disease). To encourage rural physicians and other rural healthcare professionals to utilize dietary management in diabetes, some form of Medicare/Medicaid reimbursement for nutritional therapy could be developed (as an alternative to MNT, which is legally defined). In addition, less expensive software licenses for dietary assessment solutions may alleviate the cost barrier. There is a great opportunity to create specific DSMES and DPP toolkits for rural physicians, which could be easier to implement (e.g., online modules and patient workbooks). Telemedicine remains an option for rural areas; however, it may need to be modified from its current form to fit the rural environment. A crucial aspect of successful dietary intervention is meeting the patient where they are. Cultural preferences must be included, as well as knowledge of the local foods available. For rural physicians initiating dietary therapy, this may be more important than any other factors.
The following bullet points and figure (
Figure 42) summarize the information provided here to help supplement the ADA guidelines:
Figure 42. Supplemental information to help implement dietary guidelines for people with diabetes in rural areas. In this figure, the supplementary information is summarized in a schematic form. At patient encounters, one or more nutrition-related findings could be present and the considerations for follow up are included. The globe is placed where cultural preferences would be a vital consideration for successful outcomes.
-
The process must be supportive and positive, and include cultural preferences.
-
Screen for malnutrition;
-
For weight loss, the 3500 kcal rule is a good starting point but has limitations.
-
Focus on improving diet quality, especially carbohydrate quality, to reduce micronutrient insufficiencies;
-
Limit sugar-sweetened beverages;
-
Focus on modifying snacks to help reduce energy intake, refined carbohydrates, and added sugars;
-
Increase plant foods and whole foods in the diet;
-
Decrease processed meat consumption, and reduce processed food where possible to reduce sodium;
-
Maintain good hydration;
-
Assess B12 status at least annually for those on metformin.