Vitamins and inorganic salts are essential nutrients for human body (six nutrients needed by human body: sugar, protein, fat, water, vitamins and inorganic salts). "Dietary fiber" becomes the seventh nutrient. Among these six nutrients, sugar, protein and fat not only participate in the formation of tissue cells, but also provide energy for human life activities. Water and inorganic salts participate in the formation of tissue cells, but do not provide energy; Vitamins neither participate in the formation of tissue cells nor provide energy.

Vitamins and inorganic salts are rarely needed in the human body, but their functions are very important, and if they are lacking, they will cause corresponding diseases.

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