The six nutrients refer to carbohydrates (sugars), oils and fats, protein, vitamins, water and inorganic salts (minerals). The first three nutrients generate energy after metabolism in the body, so they are also called productivity nutrients. The main function is the composition of the body and provides energy.

Macronutrients, except cellulose and water, mainly provide energy for human body, measured by joules or calories; Each gram of carbohydrate or protein provides 4 kilocalories, and each gram of fat provides 9 kilocalories.

Extended data:

Nutrients are mainly divided into macro nutrients with large demand and micro nutrients with small demand. The macronutrients include carbohydrate, fat, cellulose, protein and water. Micronutrients include minerals and vitamins. Among them, vitamins can be subdivided into fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins include: vitamins A, D, E and K; Water-soluble vitamins include vitamins B 1, B2, B6, B 12, nicotinic acid, folic acid and vitamin C.

Macronutrients, except cellulose and water, mainly provide energy for human body, measured by jouls or calories. Each gram of carbohydrate or protein provides 4 kilocalories, and each gram of fat provides 9 kilocalories. Other nutrients, including cellulose, water, minerals and vitamins, do not provide energy, but play an important role in the physiological activities of the body.

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