Nutrients are substances derived from food during the process of digestion. There are three main groups of nutrients contained in food which are needed by the body in differing amounts. They are carbohydrates, proteins, and fat. These major nutrients are needed by the body for growth, repair, maintenance and energy. In addition, the body requires fibre, vitamins and minerals which are present in varying quantities in different types of food. Good nutrition requires a balance of the right nutrients, that is, getting the proper amount, or proportion, of each one.
Our diet should provide adequate amount of all nutrients to maintain good health and physical efficiency. Daily food intake should be such that of the total consumption, about 15 to 20% is protein, 40 to 50% is complex Carbohydrates and 20 to 30% is fat.