The PCRM argues, using recent scientific studies, that the emphasis of the Basic Four Food Groups and the Food Guide Pyramid on animal products, with their high amounts of fat, cholesterol, and protein, is a significant factor in degenerative diseases, such as heart disease, stroke, several types of cancer, and osteoporosis. Hence, the PCRM is actively promoting the New Four Food Groups and striving to make it the basis for school breakfasts and lunches, as well as diets for the general public. The whole grain group - includes bread, pasta, breakfast cereal, rice dishes, corn, and other grains. Especially valuable are unprocessed whole-grain products, as compared to grains which have been ground up into flour or stripped of their bran. The vegetable group - includes broccoli, carrots, lettuce, cabbage, potatoes, and cauliflower.
Vegetables are particularly rich in vitamins and minerals.
Beta carotene, found primarily in yellow and green vegetables such as carrots, broccoli, and spinach, has been found to reduce the risk of cancer and other diseases. Green leafy vegetables are also very good sources of fiber, complex carbohydrates, and calcium. The fruit group - includes apples, bananas, peaches, pears, and oranges, as well as exotic fruits, such as kiwis and carambola. Because they are very rich in complex carbohydrates, vitamins, and fiber, fruits provide valuable resistance to heart disease, cancer, and other degenerative diseases. The legume group - includes foods that come in a pod, such as beans, peas, lentils, soy, tofu, and tempeh.