The USDA dietary standards specify the targets for each food group in equivalents in cups (for fruits, vegetables and dairy products) and in equivalents in ounces (for cereals and protein foods). The three main classes of food molecules studied in biology are carbohydrates, fats and proteins. They are also known as macromolecules, and we. Choose whole grains instead of refined grains for greater nutrition and satisfaction with breads, cereals, and cooked grains such as pasta, rice, and oatmeal.
To identify whole grains, read the list of ingredients. The word “whole” must precede the grain. We included starchy vegetables such as potatoes in this group because they are similar to cooked cereals in their macronutrient and calorie content. Foods also contain non-nutritive elements that can be harmful, such as natural toxins common in plant foods and additives, such as some colorants and preservatives, or beneficial, such as antioxidants.