2. Carbohydrates: These are chemical compounds containing Carbon, hydrogen and Oxygen. They are formed by combinations of various sugars and occur in nature as sugars, starch and cellulose depending on the simplicity or complexity of the chemical structure.
Essential Functions: Production of heat and energy, Bulk in diet.
Deficiency Symptoms: Loss of weight.
Rich Sources: Sugars, Syrups &jams, Cereals such as Rice, Potatoes and other tubers, Sago.

3. Fats: These are also energy giving foods but these are concentrated sources. One gram of fat gives 9 calories approximately. These fats, in addition, give taste to the food and make the diet palatable.
Essential functions: Production of Heat and Energy.
Deficiency Symptoms: Loss of weight, Retarded growth.
Rich Sources: Groundnut Oil, Oils like Safflower (Kardai), Cottonseed, Sesame (Gingelly), Nuts, Butter, Ghee, Cream, Margarine, cheese, Meat fats.