<P> Dairy products are produced from the milk of mammals, usually but not exclusively cattle . They include milk, yogurt and cheese . Milk and its derivative products are a rich source of dietary calcium and also provide protein, phosphorus, vitamin A, and vitamin D. However, many dairy products are high in saturated fat and cholesterol compared to vegetables, fruits and whole grains, which is why skimmed products are available as an alternative . Historically, adults were recommended to consume three cups of dairy products per day . More recently, evidence is mounting that dairy products have greater levels of negative effects on health than previously thought and confer fewer benefits . For example, recent research has shown that dairy products are not related to stronger bones or less fractures . </P> <P> Meat is the tissue--usually muscle--of an animal consumed by humans . Since most parts of many animals are edible, there is a vast variety of meats . Meat is a major source of protein, as well as iron, zinc, and vitamin B12 . Meats, poultry, and fish include beef, chicken, pork, salmon, tuna, shrimp, and eggs . </P> <P> The meat group is one of the major compacted food groups in the food guide pyramid . Many of the same nutrients found in meat can also be found in foods like eggs, dry beans, and nuts, such foods are typically placed in the same category as meats, as meat alternatives . These include tofu, products that resemble meat or fish but are made with soy, eggs, and cheeses . For those who do not consume meat or animal products (see Vegetarianism, veganism and Taboo food and drink), meat analogs, tofu, beans, lentils, chick peas, nuts and other high - protein vegetables are also included in this group . The food guide pyramid suggests that adults eat 2--3 servings per day . One serving of meat is 4 oz (110 g), about the size of a deck of cards . </P> <P> Many nutritional experts, like Harvard nutritionist Dr. Walter Willett, believe the 1992 pyramid does not reflect the latest research on dietetics . Certain dietary choices that have been linked to heart disease, such as an 8 oz (230 g) serving of hamburger daily, were technically permitted under the pyramid . The pyramid also lacked differentiation within the protein - rich group ("Meat, Poultry, Fish, Dry Beans, Eggs, and Nuts"). </P>

Where do potatoes fit in the food pyramid