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Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism and excretion.
Carefully planned nutrition must provide an energy balance and a nutrient balance. The nutrients are: 1  Proteins-essential to growth and repair of muscle and other body tissues. 2  Fats-one source of energy and important in relation to fat soluble vitamins.3  Carbohydrates-our main source of energy.arefully planned nutrition must provide an energy balance and a nutrient balance. The nutrients are: 1  Proteins-essential to growth and repair of muscle and other body tissues. 2  Fats-one source of energy and important in relation to fat soluble vitamins. 3  Carbohydrates-our main source of energy.