Why is soy protein the star among plant proteins?


What are the differences between animal and plant protein nutrition?

The reason why proteins contain different amino acids has a lot to do with the source of the protein. Protein mainly comes from animal foods and plant foods. The amino acids contained in animal proteins and plant proteins are different, which means that their nutritional values ​​are also different.

Animal protein mainly comes from meat, eggs and milk of poultry, livestock and fish. Its protein composition is mainly casein (78~85%), which can be better absorbed and utilized by adults. More importantly, animal protein has a complete range of essential amino acids in a reasonable proportion, so it is easier to digest, absorb and utilize than ordinary plant protein, and its nutritional value is relatively high. Generally speaking, the amino acid scores of meat (such as fish, beef) proteins and proteins in milk are between 0.9 and 1.0.

Plant-based protein mainly comes from rice, noodles and beans, but the protein nutritional values of rice, noodles and beans are different. Proteins derived from rice and noodles lack lysine (an essential amino acid), so their amino acid score is low, only 0.3 to 0.5. This type of protein will also be poorly absorbed and utilized by the body. Of course, this deficiency can be improved through scientific methods. For example, adding lysine-rich legumes appropriately to rice noodles can significantly improve the amino acid score of protein.

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