Nutrition, Health & National Development. Classes of foods. Nutrients, anti-nutritional factors, functions, requirements, health implications of deficiencies and excesses, inter-relationship in metabolism. Methods of assessing nutrient requirements and food-based dietary guidelines, portion sizes and serving size. Nutrition in the life cycle: requirements and relation to developmental and health risks. Foetal origin of diseases – Baker hypothesis critical timing in the life cycle and Windows of Opportunity (under-2 years). Dietary guidelines; selection and formulation of adequate diet. Food habit and factors affecting it