1, food nutrition is the most important factor in the health of the body, because people are from a small cell development and growth of adults, food nutrition is the source of material.

2, the human digestibility of various nutrients in food, mainly proteins, lipids and calcium, iron, zinc and other inorganic salts and trace elements of the digestibility.

3, food contains a variety of nutrients in the human body bioavailability, especially protein, essential amino acids, calcium, iron, zinc and other nutrients are digested and absorbed, can be utilized in the human body to the extent.