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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.
Fat is a nutrient that is necessary for health. As fat performs a number of essential functions in the body a fat-free diet is not recommended. 1  Fat is a major source of energy and also aids your body in absorbing fat soluble vitamins. 2  Fat is important for proper growth and development and for keeping you healthy. Fat adds flavor and taste to foods and gives you satiety value. 2  Fats are an important source of calories and nutrients especially for infants and toddlers. 3  Fats are known as triglycerides, both in food and in the body and they are the storage and transport form of fats.