The components of food, called nutrients, must be provided to the body in the right quantities. They are necessary for an organism to live and grow. Nutrients include proteins, fats, carbohydrates, vitamins, water, and fiber.

Nutrition studies food and nutrients and how they affect our health. It is the process by which an organism receives food and water to grow, maintain its body, reproduce, and perform activities. It covers nutrient needs, food intake methods, and how the body uses it.