Protein is the material basis of life. It can be said that there is no life without protein. When the human body loses 20% of the total protein, it will directly lead to death. When the following four phenomena occur in the human body, after the face-to-face doctor eliminates the causes of other diseases, you should consider whether the body is already lack of protein. If you follow the doctor's advice, you should supplement it in time. Do you have any of these phenomena? 1. Nail disease The main manifestation of nail disease is that nails become soft, layered and easy to break. 2. Hair becomes brittle and thin In order to conserve energy and store protein, the body will reduce the content of protein in hair, so that hair will fall off or become thinner. 3. Edema When protein intake is insufficient for a long time, the lower body will begin to edema first. You can test it this way: press the body with your hand. If the dent hasn't subsided for a long time, there may be edema. 4. Decreased immunity and frequent illness Adequate protein is very important for maintaining immunity. Lack of protein will lead to low immunity and often get sick. How much protein does the human body need? With special calculation method Now let's introduce a simple method to calculate protein requirements: height (centimeters) minus 105 (adults under the age of 60) or minus 100 (people over the age of 60). Here is your ideal weight (kilograms). The average healthy adult male or female needs about 0.8-1g protein per kilogram of body weight. Generally speaking, the minimum for women is not less than 55g / day and for men is not less than 65g / day. People who need additional protein supplement can eat 1.2-1.5 grams of protein per kilogram of body weight if there are no special contraindications. Pay attention to the maximum of 2 grams per kilogram. You can judge whether you need additional protein supplement according to your own situation. Protein intake is not the more the better It should be noted that protein supplement is by no means the more the better. If you blindly take too much, it will burden your health and even cause diseases. For example, the proportion of people with renal insufficiency is still relatively high. Some people just don't find it in time because they don't have a physical examination. If the renal function is abnormal, excessive protein will burden the kidney and aggravate the disease. In addition, excessive protein will also increase the loss of urinary calcium. People with long-term high protein intake will increase the risk of osteoporosis. It should also be reminded that high-quality protein is preferred for protein supplement. In terms of quantity, the intake of high-quality protein should reach 1 / 2 to 2 / 3 of the total protein required for a day. The food sources of high-quality protein include eggs, milk, soybeans (soybeans), fish and lean meat (white meat and red meat). How should different people eat protein? For healthy people and protein deficient people, the amount of protein consumed through diet is different. For healthy people: In addition to eating the staple food in an appropriate amount every day, it also includes 1-2 bags of milk (a bag of 250ml), 1 egg (people with high cholesterol can have one every other day), 2 liang of lean meat (red meat + white meat, the ratio of red meat to white meat is 1:1), and 2 liang of bean products. You can't eat as much food as you need every day. For people with protein deficiency: One bag of milk, one egg, three liang of lean meat and three liang of tofu every day, and gradually supplement protein. (outlook new era)