Nutrition

Nutrition is the biochemical and physiological process by which an organism uses food and water to support its life. The intake of these substances provides organisms with nutrients which can be metabolized to create energy and chemical structures; too much or too little of an essential nutrient can cause malnutrition.

Nutritional science, the study of nutrition as a hard science, typically emphasizes human nutrition.

Source: https://en.wikipedia.org/wiki/Nutrition