This mainly does not include: protein digestibility. Because according to the index definition for evaluating the nutritional status of protein, it mainly includes three aspects, namely, serum protein, serum amino acid ratio (SAAR), upper arm muscle circumference and upper arm muscle area. The protein digestibility here is a common misunderstanding that is easily misunderstood.

Characteristics of protein:

Protein is the material basis of life, an organic macromolecule, a basic organic substance that constitutes cells, and the main undertaker of life activities. There is no life without protein. Amino acids are the basic components of protein. It is a substance closely related to life and various forms of life activities.

Protein participates in every cell and all important parts of the body. Protein accounts for 0/6% ~ 20% of human body weight, that is, there is about 9.6~ 12kg of protein in a 60kg adult body. There are many kinds of protein in human body, with different properties and functions, but they are all composed of 20 kinds of amino acids in different proportions, which are constantly metabolized and updated in the body.

Refer to the above content: Baidu Encyclopedia-protein