A new food guide for North American vegetarians
The first North American food guide was published by the US Department of Agriculture (USDA) in 1916. It was not until the 1940s, however, when wartime shortages, indications of malnutrition among citizens, and the release of the first recommended dietary allowances focused greater attention on nutrient requirements, that food guides became a familiar meal-planning tool in the United States (1). The Canadian government released its first food guide at this time, in 1942 (2). Until 1992, when the USDA's Food Guide Pyramid (3)and Canada's Food Guide to Healthy Eating (CFGHE) (2) with its rainbow design were introduced, the emphasis of food guides was largely placed on meeting nutrient needs.
The 1992 guides were the first to consider the harmful effects of overnutrition. They were also the first guides to visually emphasize the importance of plant foods in the diet. However, they did not include sufficient guidelines for planning vegetarian diets. USDA publications noted that vegetarians needed special guidance in planning healthful diets, implying that the USDA's food guide was not appropriate for vegetarians (4).
Over the past several decades, a number of meal-planning tools have been developed specifically for vegetarians (5,6). The majority of these have used the pyramid format or the rainbow design, and many have been revised versions of the USDA's Food Guide Pyramid and CFGHE. However, because vegetarian diets differ in many ways from nonvegetarian diets, the USDA Food Guide Pyramid and CFGHE are not necessarily the most useful starting point when considering guidelines for vegetarians. It is particularly difficult to manipulate these tools when attempting to provide adequate and practical guidelines for vegans (vegans are vegetarians who exclude all animal products).
In designing a new food guide for vegetarians, we aimed to achieve the following goals:
- To establish a guide that would meet the needs of people following different types of vegetarian diets;
- To help vegetarians choose diets that would meet the most recent recommendations established by the Institute of Medicine;
- To include guidelines that focus on specific nutrients of particular interest in vegetarian diets, as discussed in the American Dietetic Association (ADA) and Dietitians of Canada's joint position on vegetarian diets in this issue of the Journal of the American Dietetic Association (7,8);
- To include a wide variety of foods that are consumed by vegetarians; and
- To increase awareness about the availability of calcium from nondairy foods.
In addition, we strived to meet the challenge spelled out in the 1981 issue of the Journal of Nutrition Education by then US Food and Drug Administration (FDA) nutritionist Jean Pennington for an “instrument which converts the professional's scientific knowledge of food composition and nutrient requirements for health into a practical plan for food selection by those without training in nutrition” (9).
Challenges in designing such a guide exist regardless of dietary pattern. Individual food preferences, habits, and choices within food groups will all impact diet quality. Although no food guide is completely reliable, a food guide can maximize the chances that consumers will choose healthful diets. The inclusion of “Eight Tips for Meal Planning” (Figure 1) provides additional help to vegetarians in planning healthful diets.
Fig. 1. Tips for meal planning.
The food guide principle that has been in use in North America since 1916 is based on an approach that classifies foods into groups based on similar nutrient content. We have adhered to this principle, with some modification. In the vegetarian food guide, calcium needs are met through choices from several food groups.
In keeping with familiar and widely used approaches to food guide presentation in North America, we have designed our guide in the forms of both a pyramid and a rainbow; the latter is the graphic used in Canada. Both guides use the same food groupings, specify the same number of servings, and can be used interchangeably (Figures 2 and 3).
Fig. 2. Vegetarian food guide pyramid.
Fig. 3. Vegetarian food guide rainbow.
Foods are grouped as follows:
- Grains: At the base of the pyramid and in the widest arc of the rainbow, these foods form the foundation of the diet. Grains provide energy, complex carbohydrates, fiber, iron, and B-vitamins. Whole grains are an important source of zinc and other minerals. Vegetarians should choose whole grains often, but enriched refined grains can play a role in vegetarian diets and may be especially valuable for children.
- Vegetables and fruits: Vegetables have been grouped separately from fruits to encourage vegetarians to choose a variety of both types of food rather than to focus on one or the other for most choices. A higher number of servings of vegetables is specified because of the greater nutrient density and phytochemical content of vegetables compared with fruits.
- Legumes, nuts, and other protein-rich foods: This group includes foods that are good sources of protein, B-vitamins, and many trace minerals. It includes all legumes, including soy products such as soy milk and tofu, as well as nuts, seeds, nut and seed butters, eggs, and meat analogs. In a departure from most existing food guides, we have placed dairy foods in this group as well. This groups dairy products with other foods that offer similar amounts of protein per serving. It makes dairy an available but optional choice for vegetarians, while ensuring that protein needs will be met whether or not dairy foods are included in the diet. Categorizing dairy foods with other protein sources also meets the goal of emphasizing the availability of calcium from all of the food groups. Most of the foods in this group provide iron, which is well absorbed when a source of vitamin C is consumed with the meal (10). Dairy foods are the exception here, and those vegetarians who consume frequent servings of dairy foods should be advised to ensure that they are including adequate sources of iron in their meals.
- Fats: Vegetarians and others who do not eat fish require small amounts of plant sources of n-3 fats. In addition, research suggests that moderate intake of certain healthful plant fats may reduce risk for cardiovascular disease (11), may improve nutrient intake (12), and may even aid in weight control (12). Ideally, most of the fat in vegetarian diets should come from fat-rich whole plant foods such as nuts, seeds, and avocado. To ensure an optimal fat intake and to support a practical approach to meal planning, we have specified a minimum of two servings of fats per day. Figure 1 indicates that nuts or seeds may be used in place of these fats and also directs vegetarians toward choosing the most healthful fats.
- Calcium-rich foods: Adults should choose a minimum of eight servings of calcium-rich foods daily. Each serving also counts toward choices from one of the other food groups in the guide. For example, 1 cup of certain cooked leafy green vegetables counts as a serving from the calcium-rich foods group and as 2 servings from the vegetable group. Placement of the calcium food group adjacent to each of the other food groups allows this concept to be presented in a clear visual way. It also emphasizes the fact that calcium needs are met by choosing a variety of foods from across the food groups.
- Diets based on the minimum specified servings from each of the food groups provide approximately 1,400 to 1,500 calories per day, which may be an inadequate energy intake for many vegetarians. Because the numbers of servings in the food guide are minimum recommendations, consumers can meet higher energy needs by choosing more servings from any of the food groups. Regardless of energy needs, most food choices should come from these groups, with only moderate servings of sweets and alcohol at most.
Expanded choices for meeting calcium needs
Survey data suggest that vegans account for as much as 40% of the actual vegetarian population (13). Actual vegetarians are those who never eat meat, in contrast to self-described vegetarians, many of whom actually eat some type of animal flesh regularly. Therefore, any guide aimed at vegetarians must consider the needs of vegans. Studies also indicate that a substantial percentage of vegan women as well as some lacto-ovo-vegetarian women (lacto-ovo-vegetarians are those vegetarians who use dairy products and eggs) have calcium intakes that are too low, which suggests that calcium deserves special attention in vegetarian food guides (14). With few exceptions, vegetarian food guides have not provided appropriate guidelines for vegans. A number of guides have included an optional dairy group, which presents the risk that consumers will choose diets that are deficient in both calcium and protein. Other guides have included a dairy group that also includes fortified soy milk. However, not all vegans choose to consume soy milk daily. Those who do may not wish to consume the two to three recommended servings. For many families, the expense of soy milk compared with cow's milk makes it an unrealistic choice as the primary source of calcium in the diet.
This food guide illustrates acceptable choices in addition to dairy foods and fortified soy milk for meeting calcium needs. It incorporates the principles of variety and moderation and encourages consumers to consider more plant foods as sources of nutrients. This is in keeping with government recommendations. Although this food guide does not emphasize the value of one calcium source over another, there may be an advantage to including more plant sources of calcium in diets because research suggests that other compounds in plant foods, such as isoflavones in soy foods (15) and potassium (16) and vitamin K (17) in fruits and vegetables, may favorably impact bone health.
By including foods that provide approximately 10% to 15% (100 to 150 mg) per serving of the adult adequate intake for calcium, we have allowed consumers to meet calcium needs using a variety of foods in realistic serving sizes. Although the serving size of one-half cup for milk differs from many other food guides, it is consistent with common serving sizes on many food labels, such as on puddings or for use with breakfast cereals.
It should be noted that this approach of emphasizing the variety of calcium-rich foods in different food groups is not specific to the needs of vegetarians but could be adopted for those who consume nonvegetarian diets as well. The advantages of this approach are relevant for all consumers regardless of diet choices.
Special considerations for vegetarians
Unsupplemented vegan diets do not provide vitamin B-12. Dairy products and eggs supply vitamin B-12; however, depending on food choices, some lacto-ovo-vegetarians may have inadequate intakes as well. The Institute of Medicine has recommended that all people over the age of 50, regardless of type of diet, take vitamin B-12 in the form found in supplements and fortified foods for optimal absorption (18). Vitamin B-12 is well-absorbed from fortified nondairy milks and from breakfast cereals, as well as from supplements. Because vitamin B-12 absorption is inversely related to dosage, we have recommended a daily supplement of at least 5 µg or a weekly supplement of 2,000.
In addition to regular supplementation with vitamin B-12, vegans require a dietary source of vitamin D when sun exposure is insufficient. This occurs at northern latitudes and in certain other situations. Many fortified nondairy milks and breakfast cereals provide vitamin D, although the form used to fortify cereals is often not vegan. Vegetarians may also choose vitamin D supplements.
Figure 1 provides specific guidelines for meeting needs for vitamins B-12 and D. The vegetarian food guide is based on the nutrient needs of adults. It can be modified to meet the needs of people at different stages of the life cycle. The Table shows modifications in food group servings for different age groups.
Modifications to the vegetarian food guide (Figures 2 and 3) for children, adolescents, and pregnant and lactating women
|Life cycle||B-12-rich foods (servings)||Beans/nuts/seeds/egg (servings)||Calcium-rich foods (servings)|
aThe number of servings in each group is the minimum amount needed. The minimum number of servings from other groups is not different from the vegetarian food guide (Figures 2 and 3). Additional foods can be chosen from any of the groups in the vegetarian food guide to meet energy needs.
b4 to 8 years.
c9 to 13 years.
d14 to 18 years.
In summary, this vegetarian food guide has a number of advantages over previous guides designed for this population:
- It is based on current nutritional science. This guide aims to provide sufficient nutrient intake based on the most recent dietary reference intakes and addresses concerns such as balance of fats in diets.
- It provides information about how to meet calcium needs that is appropriate to a wide range of individuals, including those who follow lacto-ovo-vegetarian diets and vegan diets.
- It promotes the concepts of variety and moderation. Many other guides for both vegetarians and nonvegetarians direct consumers only to dairy foods to meet calcium needs, whereas this guide emphasizes the wide variety of foods that can meet calcium requirements.
- It focuses on foods that are commonly consumed by vegetarians.
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18. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline Washington, DC: National Academy Press; 1998.
- V. Messina is a nutrition consultant with Nutrition Matters, Inc., Port Townsend, WA. V. Melina is a nutrition consultant with Nutrispeak.com, Langley, BC, Canada. A. R. Mangels is a nutrition advisor to The Vegetarian Resource Group, Baltimore, MD.
- Address correspondence to: Virginia Messina, MPH, RD, 439 Calhoun St, Port Townsend, WA 98368. E-mail: email@example.com
Copyright © 2003 by the American Dietetic Association.