The seven nutrients required by the human body are protein, carbohydrates, fats, vitamins, minerals, water, and fiber.
Proteins are the basis for the composition of matter. Carbohydrates are the main source of calories for the body. Fats provide the body with energy, protect the internal organs, and moisturize the muscles as well as the skin.
Vitamins are essential nutrients for the body. Water is an important component of the body. Fiber promotes defecation in the organism.
The seven nutrients can play three physiological roles in the body: first, protein, carbohydrates and fat provide the body with sufficient energy. Secondly, proteins and other substances are the building blocks of the human body. Third, proteins, carbohydrates, vitamins, fiber and minerals as regulatory substances, regulating the physiological functions of the body.
Seven nutrients are indispensable, so usually need to rationalize the meal, to achieve a balanced and reasonable diet.