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The Food Pyramid is a visual image illustrating the contributions of each group of foods that make up a healthful diet.
The US Department of Agriculture (USDA) created the first Food Pyramid, which placed foods recommended for frequent consumption at the base and foods that should be eaten sparingly at the top. Other pyramids emphasizing ethnic and other food preferences have been developed following this design. The most recent update of the USDA pyramid changes this basic design by dividing it into vertical wedges of different widths to represent the different food groups. This update also represents a shift in thinking in American nutrition. Greater emphasis is placed on weight control and exercise, whole grains are recommended over processed grain products, and rather than recommending a diet low in all fats, emphasis is placed on avoiding solid fats (those that are high in trans fats and saturated fats) while allowing foods that are good sources of monosaturated fats and essential fatty acids.
The new USDA Food Pyramid is meant to be used in conjunction with the Web site (mypyramid.gov), where information about a person's age, gender, and physical activity level is used to calculate a personal recommendation for the amount of each food group to be eaten daily. The Web site also offers tips for following these recommendations, diet and exercise tracking tools, and additional information.
The basic pyramid, developed by the USDA and the US Department of Health and Human Services, is only one model, however. This pyramid has been adapted for ethnic preferences and there are now pyramids for the Mediterranean diet, the Asian diet, and the Latin American diet. Other diets, such as the vegetarian diet, can also be placed on a food pyramid.
The personal recommendations available from the USDA Web site suggest that people:
Milk and other calcium-rich products
Extra calories from added fats, sugars, and alcohol
Some variations on the USDA Food Pyramids represent alternative views of healthful eating by expert groups. For example, the Healthy Eating Pyramid was designed by nutrition experts from the Harvard School of Public Health who felt the USDA Pyramid does not fully reflect all of the research evidence on healthful food choices. This pyramid rests on a foundation of daily exercise and weight control, with emphasis on whole grain foods, plant oils, fruits, vegetables, and some nuts and legumes.
Some food pyramids reflect personal preferences, such as vegetarianism. The Oldways Preservation & Exchange Trust has designed the Traditional Healthy Vegetarian Diet pyramid to represent eating patterns found in healthy populations of the world. This diet emphasizes whole grains, fruits, vegetables, and legumes and beans form the basis for each meal, with some milk and egg products. The recommendations are appropriate for most healthy adults, but the guidance of a knowledgeable healthcare professional should be sought to make adjustments for children, women in their reproductive years, and anyone else who may have special nutritional needs.
Other pyramid variations are based on diets from regions with historically lower chronic disease rates, such as the Mediterranean, Asian, and Latin American pyramids shown here. They may be worth considering if your family has a history of heart disease, cancer, high blood pressure, or diabetes.
Major differences from the USDA pyramid include:
At first, figuring out what counts as a serving may seem a little tricky. Some servings are close to what people would typically consume at a meal; others are much smaller. For instance, a single serving of rice is only one-half cup whereas people are more likely to consume a cup. A hamburger bun is two to three servings (depending on size). This is not a problem as long as you factor this in before you plan your day’s servings. It is more important for people who are trying to keep a level blood sugar, which is achieved by distributing carbohydrates evenly throughout the day.
When calculating your servings of each food group, be sure to focus on the labels of packaged foods. They contain a great deal of valuable information. To learn more about food labels and how to read them, go to the section on Food Labels.
The USDA recommends daily amounts according to calorie requirements for each of the food groups in the pyramid.
The USDA recommends 3 to 10 standardized units—“ounce equivalents”—from this group, at least half of which should come from whole grain products such as brown rice, whole grain bread, pasta, and cereals.
Typical ounce equivalents are:
The USDA recommends 1 to 4 cups from this group. Vegetable subgroups that should also be included one or more times per week are dark-green vegetables, orange vegetables, and legumes (beans).
Typical cup equivalents of vegetables are:
The USDA recommends 1 to 2 1/2 cups from this group. Juice should be used for less than half of the total fruit intake to ensure adequate fiber is eaten.
Typical cup equivalents of fruit are:
The USDA recommends 2 to 3 cups from this group. Most milk group choices should be fat-free or low fat. Milk products having little or no calcium content (butter, cream, cream cheese) are not part of this group. Those who avoid milk should be sure to eat other calcium-rich foods, such as calcium-fortified beverages, some beans, and some leafy greens.
Typical milk servings are:
The USDA recommends 2 to 7 ounce equivalents per day from this group. The group includes meat, poultry, fish, dried beans and peas, eggs, nuts, and seeds. Meat and poultry choices should be low in fat. Fish, nuts, and seeds contain more healthful oils and fats than meat, and can frequently be chosen instead of meat or poultry.
Typical meat ounce equivalents are:
The USDA recommends 3 to 11 teaspoons per day from this group, which includes fats from fish and plant-based oils that are liquid at room temperature, such as canola, corn, olive, soybean, and sunflower oils. Foods that are naturally high in oils (nuts, olives, avocados), as well as foods that are mainly oil (mayonnaise, certain salad dressings, trans-fat-free soft margarine), may be used to meet these recommendations.
Teaspoons of oil in typical amounts of foods include:
Depending on your daily calorie requirements between 165 to 648 additional calories are allowed after satisfying the above food group requirements. These additional calories can be consumed in several ways:
The USDA recommends physical activity, such as walking, gardening, briskly pushing a baby stroller, climbing the stairs, playing soccer, or dancing. For health benefits, physical activity should be moderate or vigorous and add up to at least 30 minutes a day. Activities should only count toward your overall activity level when they increase the heart rate.
Moderate physical activities include:
Vigorous physical activities include:
MyPyramid.gov. www.mypyramid.gov (Accessed May 11, 2005.)
Dietary Guidelines for Americans 2005. www.healthierus.gov/dietaryguidelines (Accessed May 11, 2005.)
Harvard School of Public Health.www.hsph.harvard.edu/nutritionsource/pyramids.html (Accessed June 15, 2005.)
Oldways Preservation & Exchange Trust. www.oldwayspt.org. (Accessed June 15, 2005.)