Many food sources in protein include plant food and animal food. Plant foods mainly include cereals, beans and nuts. Cereals: Cereals generally contain about 10% protein. China residents mainly use plant food, and cereals are the staple food, which is one of the main sources of dietary protein. The protein content of wheat, oat, corn and rice is 8%, 15%~22%, 10% and 6%~8% respectively. Beans: Beans are rich in protein, especially soybeans. The content of protein is as high as 36%~40%, and the amino acid composition is reasonable. They are very good sources of protein.

Nuts: Nuts contain 12%~36% protein, which is rich in minerals and vitamins, but nuts are a high-energy food. Eating proper amount of nuts every week is good for heart health. Animal foods include eggs, milk, meat and so on. Eggs: Generally, the protein content of eggs is 1 1%~ 14%, and the amino acid composition is relatively balanced. Eggs are usually used as reference proteins and are the main source of high-quality protein. Milk: protein content is generally 3.0%~3.5%, and its amino acid composition is relatively balanced, so it is one of the sources of high-quality protein. Meat: Meat includes livestock.

It is worth noting that protein cannot accumulate in the body. After excessive intake of protein, excessive amino acids will synthesize glucose and fat. Although the rate of fat synthesis in protein is very slow, too much protein will eventually increase fat and weight. This is one of the reasons why some people who eat high-protein food for a long time can't lose weight. At the same time, long-term intake of excessive protein will be harmful to health and cause diseases, such as halitosis, depression, kidney injury, hyperglycemia and other symptoms. Maintain a healthy diet, proper exercise, adequate sleep and a good mental state, so as to achieve a healthy body.

Common high-protein foods include: milk of livestock, such as milk, goat milk, horse milk and so on. ; Livestock meat, such as cattle, sheep, pigs and dog meat; Poultry meat, such as chicken, duck, goose, quail, ostrich, etc. ; Eggs, such as eggs, duck eggs, quail eggs, fish, shrimp, crabs, etc. ; There are also soybeans, including soybeans, green beans and black beans. Among them, soybeans have the highest nutritional value and are the source of high-quality protein in infant food; In addition, the content of protein in sesame, melon seeds, walnuts, almonds, pine nuts and other dried fruits is high. Because the contents and types of amino acids in various foods are different, the contents of other nutrients (fat, sugar, minerals, vitamins, etc.) are also different. ) It's different, too. The above foods can be selected when thin people are doing a fattening diet, or high-protein foods can be selected according to local specialties and local conditions.