Food has many different components and each component is necessary for one function or the other. The major components of our food are:1. Carbohydrates2. Fats3. Proteins4. Mineral (salts)5. Water6. Roughage7. Vitamin The carbohydrates proteins, fats, minerals salts and vitamins are called nutrients because they are required for the survival of living beings like human beings. Thus water is an important constituent of our food and makes up for two third of our body- weight, it is usually not considered a nutrient. Our diet usually contains the entire nutrient in varying amounts. For example, egg or meat give us proteins, butter and ghee give us fats, whereas fruits and vegetables give use minerals and vitamins. We shall now discus all the components of food in detail, one bye.