Although soybeans are rich in protein, the idea that eating more soybeans can supplement protein is incorrect.
This is because, while soybeans contain a lot of protein, they have fewer types of amino acids and contain 7-10 types of protein digestion inhibitors. These inhibitors hinder the digestion and absorption of soybeans and can also produce a large amount of gas, causing bloating. More detrimentally, the protein digestion inhibitors in soybeans not only make the protein in soy products themselves difficult to digest, but also affect the digestion of other foods. Therefore, soy products should not be consumed in large quantities.
Protein is a nutrient essential for the human body to grow tissues and organs and repair damage. Milk, eggs, lean meat, and poultry are the best sources of protein, as these foods contain the essential amino acids that the human body cannot synthesize. A portion of protein can also be obtained from fruits, vegetables, grains, and legumes, but the protein in these foods is incomplete in terms of amino acid types and must be consumed in combination with foods that contain a full spectrum of amino acids.