Protein food sources of protein can be divided into two categories: plant protein and animal protein.

Among plant proteins, cereals contain about 10% protein. The protein content is not high, but because it is people’s staple food, it is still the main source of dietary protein.

Beans are rich in protein, especially soybeans, which contain up to 36% to 40% protein. The amino acid composition is also relatively reasonable, and their utilization rate in the body is high. They are a very good source of protein among plant proteins.

Eggs contain 11% to 14% protein and are an important source of high-quality protein.

Milk (milk) generally contains 3.0%~3.5% protein and is the best source of protein for infants and young children.

Meat includes the muscles of poultry, livestock and fish. Fresh muscle contains 15%~22% protein.The nutritional value of muscle protein is better than that of plant protein and it is an important source of human protein.