Lack of protein, you can use plants to supplement, and you said protein powder to supplement. There are many brands of protein powder, which can be bought at the counter of general health care products. Personally, I admire the brand Amway Nutrilite, because I also have low immunity and need to supplement protein to improve my immunity. The so-called protein powder is generally powder composed of purified soybean protein, casein, whey protein, or the combination of the above protein, and its purpose is to supplement protein for people who lack protein. Protein is the most important nutrient to ensure good health. This is necessary to maintain and repair the growth of the body and cells. It not only affects the growth of muscle and other body tissues, but also participates in the production of hormones, the maintenance of immune function, the transportation of other nutrients and oxygen, the production of hemoglobin and blood coagulation. The daily protein required by ordinary mental workers is 0.8- 1.0g per kilogram of body weight, while the demand of athletes and bodybuilders engaged in high intensity is 2-3 times that of them. Because high-intensity exercise damages muscle cells to varying degrees, causing the decomposition of muscle protein, timely supplementation of protein can reduce the destruction of muscle tissue, promote the synthesis of protein, and even recover excessively, thus increasing muscle and improving strength. The traditional way of supplementing protein by eating meat often leads to excessive fat intake, which leads to the increase of body fat and even affects cardiovascular health. Children in growth and development need a lot of protein to meet the needs of physical development, while pregnant women need a lot of protein to make red blood cells and fetal development. The traditional tonic method of big fish and big meat often makes many women still have a big belly after giving birth, because they make up a lot of fat while making up protein. Patients after operation and those who have recovered from a serious illness also need a lot of protein to promote recovery and improve immunity. In addition, people with poor appetite or digestive function, dieters and vegetarians may have insufficient intake of protein, which will not only lead to children's developmental retardation and affect the body's water metabolism, but also lead to various diseases such as low immune function, poor sleep and anemia. In these cases, high-quality protein powder has become a good supplement. Main functions of protein powder 1, promoting muscle growth 2, improving immunity 3, repairing cells and building tissues 4, forming all cells and tissues in the body 5, maintaining normal function and metabolism of cells 6, forming enzyme system and maintaining normal digestive function 7. Make blood transport substances and maintain the osmotic pressure of the body. The catalysis of enzymes. Regulation hormone 10, oxygen transport 1 1, muscle contraction 12, immunity 13, scaffold 14, regulation immunity, anti-fatigue 15, and moderate consumption of neutralized body fluid protein powder. For the special population in need, apart from supplementing essential amino acids through food, protein powder can be appropriately selected as a supplement to protein, but the dosage of protein powder must be paid attention to. After protein is digested and absorbed by gastrointestinal tract, it needs to be processed by liver and converted into human substances for human use. At the same time, nitrogen-containing substances such as ammonia, urea and creatinine, which are products of protein's metabolism in the body, need to be excreted through the kidneys. If a person ingests too much protein, it will increase the burden of liver and kidney and have a negative impact on the human body. Therefore, protein is by no means the more the better. The highest intake of protein in the Dietary Guidelines for China Residents is 0.92g per kg of body weight, and if it exceeds this amount, it may be harmful to human health. In fact, protein only needs to meet the needs of human metabolism. After the excess protein is digested and absorbed, the liver will convert them into hepatic glycogen or muscle glycogen for storage; If liver glycogen or muscle glycogen is enough, it will be converted into fat and stored; Other metabolites produced by this transformation must be excreted from the kidneys. Excessive protein not only makes people obese, but also increases the metabolic burden of liver and kidney, which may affect their functions over time. It should be reminded that while supplementing protein, we should also pay attention to supplementing carbohydrates (sugars), lipids, vitamins and minerals. Because the lack of these nutrients will not only affect the utilization and metabolism of protein, but also cause some diseases, which is very harmful to health. Who should use protein powder with caution? 1. Patients with nephropathy should strictly limit the intake of protein, and protein mainly contains 9 essential amino acids. The amount of protein should be limited to 20 ~ 40g/ day. 2. Patients with liver disease should increase the intake of protein due to the obstacles in the processing and utilization of protein by the liver. However, for patients with hepatic coma and advanced cirrhosis, too much protein will increase the burden on the liver and aggravate the condition, so animal protein should be restricted. Because its metabolism in the body will produce more ammonia, which can induce or aggravate liver coma, such patients can choose some plant proteins rich in branched-chain amino acids, especially soybean proteins. Because branched-chain amino acids are mainly metabolized in muscles, they have protective effects on liver function. 3. Newborns should not eat protein powder. They should choose milk powder with protein content of 10% ~ 20%. 4. Gout patients should avoid eating protein powder with soybean protein as the main component. Because the purine in soybean will increase uric acid in the body and promote or aggravate gout. Side effects of protein powder Side effects of protein powder: Eating too much protein is not only a waste, but also harmful to human health, because the decomposition products of protein accumulate in the body, which will affect normal liver and kidney function and low immunity, and eating too much animal protein will also induce heart disease. In addition, excessive intake of protein will increase the risk of cancer.