Protein exists in every corner of the body. In muscle, bone, skin, hair, and virtually any other body part or tissue. It makes up the enzymes that power many chemical reactions and hemoglobin, which carries oxygen in the blood. Proteins are large biomolecules, or macromolecules, that consist of one or more long chains of α-amino acid residues. The α-amino acid molecules are arranged linearly, and the carboxyl and amino groups of adjacent α-amino acid residues are linked together by peptide bonds, and finally folded to form a functional three-dimensional structure. The α-amino acid sequence of a protein is encoded by the corresponding gene.
If a person does not consume food containing protein for a long time. Then that person loses muscle mass, which in turn weakens your strength, makes it harder to maintain your balance, and slows down your metabolism. Slowing your metabolism can lead to weight gain year after year, even if you don't eat much more than usual. For example, if you eat a bowl of ice cream every night -- about 500 calories -- you'll be eating an extra 3,500 calories that week, equivalent to a pound of fat.
According to the data, the National Academy of Medicine recommends that adults consume at least 0.8 grams of protein per kilogram per day or slightly more than 7 grams of protein per 20 pounds of body weight. About 50 grams of protein per day for a 140-pound person. A 200-pound person needs about 70 grams of protein a day.
The National Academy of Medicine also sets a broad range for acceptable protein intake -- anywhere from 10 percent to 35 percent of daily calories. Beyond that, there is relatively little reliable information on the ideal amount of protein in the diet or the healthiest goals for the calories contributed by protein. Harvard University followed more than 130,000 men and women for up to 32 years and found that total protein intake as a percentage of calories was not associated with overall or specific causes of death.
In early childhood, some children cannot get the protein needed to maintain the body's functioning due to family reasons, which leads to growth failure and loss of muscle mass, decreased immunity, and then to weakness of the heart and respiratory system, which finally leads to death.
Until now, symptoms of protein deficiency have rarely been reported in healthy adults in the United States and other developed countries. Because in the United States, food is relatively sufficient. Americans already eat more than enough protein, and it could even be said that everyone eats more than they can. There is plenty of protein in the meat we eat every day.
Heart disease, diabetes, cancer, premature death, bones, weight, any of these will increase your chances of suffering from these diseases if you eat more red meat or processed red meat, but eat nuts, low-fat dairy products, etc. If it is food, it will reduce the chance.
Including unprocessed beef, pork, lamb, veal, lamb, and goat -- should be eaten on a more limited basis. If you enjoy red meat, consider eating it in small quantities or only on special occasions.
Get protein from plants when possible. Because getting protein from plants is good for our health and the health of the planet. If most of your protein comes from plants, make sure to mix sources so you don't lose the "essential" components of your protein. Here are some examples for each category: mung beans, almonds, wheat, corn, and more.
This picture gives us a relatively easy-to-understand concept, and this "scorecard" from the World Resources Institute illustrates the different greenhouse gas emissions per gram of protein for animal and plant-based protein foods.
 As little as one pound (454 grams) of lamb produces as much greenhouse gas emissions as a pound of chicken and roughly 30 times as much as a pound of lentils.
 Beef is responsible for 36% of all food-related greenhouse gas emissions in the United States alone.
 Beyond emissions, it is also important to note that food production places enormous demands on our natural resources, as agriculture is a major cause of deforestation, species extinction, freshwater depletion, and pollution.
Protein powder is a popular nutritional supplement. Protein is an essential macronutrient that helps build muscle, repair tissue, and make enzymes and hormones. Using protein powder can also aid in weight loss and help people build muscle. So for bodybuilding enthusiasts, protein powder is a very popular thing.
Eating protein helps the body grow strong muscles and repair itself after injuries. Protein is also an important part of skin, blood, and bones. Hair, fingernails, and animal hooves are made out of protein too! Farm animals need protein too.
Protein is one of the most important things for humans and animals to continue to survive on the earth. If we lack protein in our lives, then we will be malnourished. However, judging from the current situation, human beings are speeding up the consumption of the earth's resources. It is felt that the source of protein will disappear around 2100. I hope that before the day when the protein disappears, biological scientists can develop a substitute for protein. I also hope that Human beings reduce unnecessary consumption and protect the earth.