<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> <P> In April 1991, the U.S. Department of Agriculture (USDA) halted publication of its Eating Right Pyramid, due to objections raised by meat and dairy lobbying groups concerning the guide's display of their products . Despite the USDA's explanations that the guide required further research and testing, it was not until one year later--after its content was supported by additional research--that the Eating Right Pyramid was officially released . This time, even the guide's graphic design was altered to appease industry concerns . This incident was only one of many in which the food industry attempted to alter federal dietary recommendations in their own economic self - interest . </P>

What did the original food guide pyramid fail to illustrate