Nutrition is the Study of the influence of food intake on health and wellbeing. Nutrition can be defined as the Science which deals with those processes by which body utilizes food for energy, growth & maintenance of health. The importance of nutrition in the primary prevention of disease (public health nutrition) is recognized by governments in both developing and developed countries. Public health nutrition involves studying the relationships between dietary intake and disease using the tools of nutritional epidemiology and applying the knowledge gained to help prevent disease in the population. Dietetics is the application of nutritional knowledge particularly tailored to individual needs. Dietary habits & choices play a significant role is the quality of life, health & longevity.