Nutrition is the science that deals with digestion, absorption and metabolism of food. The effect of food in our body is explained in nutrition. In other words, nutrition is defined as food at work in the body. In a broader sense nutrition is defined as ‘the science of foods, the nutrients and other substances therein; their action, interaction and balance in relationship to health and disease’. It is the process by which the organism ingests, digests, absorbs, transport and utilizes nutrients and dispose off their end products. In addition nutrition must be concerned with the social, economic, cultural and psychological implication of food and eating.