To help describe a varied diet, nutrition scientists and educators group foods by the nutrients they contain. A varied diet that contains foods from these groups each day provides the protein, vitamins, minerals, starch and dietary fiber needed. Foods from this group supply mainly calories and few vitamins and minerals. Eat them in moderation. It also is wise to vary food choices within the main groups.
Specific foods differ in the kinds and amounts of nutrients they provide.
For example, include red meats, poultry, fish and beans in a week's menu. Pick different breads, fruits and vegetables as well. Be sure to include dark green leafy vegetables, dry beans and peas, and whole-grain breads and cereals. These foods provide dietary fiber and nutrients that are low in many diets. The amount of food you need depends on your age, gender, physical condition and activity level.