Nutrition is the selection and preparation of foods. By staying on a healthy diet, many of the known health issues can be avoided.
Food is any substance consumed to provide support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism and assimilated by the organism's cells in an effort to produce energy, maintain life, and stimulate growth.
A healthy diet is one that helps maintain and improve general health. Such a diet provides the body with essential fluids, amino acids, fatty acids, vitamins, minerals, and calories.