Three common categories of food protein

1, complete protein

This is a kind of high quality protein. Types of essential amino acids they contain complete and sufficient quantity of appropriate proportion to each other.

This type of protein can not only maintain human health, but also can promote the growth and development. Milk, eggs, fish, meat proteins belong to the complete protein.

2, semi-complete protein

Although these proteins contained in the full range of amino acids, but some of them the number of amino acids can not meet the body's needs.

They can sustain life, but can not promote the growth and development. For example, the Wheat gliadin is the semi-complete protein, containing lysine little.

Of food contained in the gap compared with the human body needs a certain kind or certain kinds of amino acids called the limiting amino acid. Cereal protein lysine content usually less, so that their limiting amino acid is lysine.

3, incomplete protein

Such proteins can not provide all the essential amino acids needed by the body, they can not simply rely on the promotion of growth and development, we can not sustain life.

For example, the pork skin in the collagen protein is incomplete proteins.