Some consider food to be divided into three main groups. The first group includes cereals, such as corn, wheat, rice, oats, rye, barley, and millet, as well as tubers, such as potatoes and yams. These carbohydrates supply quick energy. The second group includes legumes, such as beans, soybeans, lentils, chick-peas, and broad beans, and some foods of animal origin, such as meat, fish, eggs, and milk and its derivatives. These are a source of protein, iron, zinc, and several vitamins. The third group includes fruits and vegetables. These provide essential vitamins and minerals. They also supply fiber and provide energy, and they represent the only natural source of vitamin C.

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THE FIRST GROUP: cereals and tubers

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THE SECOND GROUP: legumes, meat, fish, eggs, and milk and its derivatives

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THE THIRD GROUP: fruits and vegetables