The Role Of Proteins

Under the action of gastric juice digestive enzymes, the protein is preliminarily hydrolyzed to complete the entire digestion and absorption process in the small intestine. The absorption of amino acids is carried out by the active operating system through the cells of the small intestinal mucosa, transporting neutral, acidic and basic amino acids, respectively. The protein that is digested and absorbed in the intestine comes not only from food, but also from the exfoliation of intestinal mucosal cells and the secretion of digestive juices, etc., and about 70g of protein enters the digestive system every day, most of which is digested and reabsorbed. Unabsorbed proteins are excreted in the stool.
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The kidneys excrete the protein they eat, and when the protein is broken down, a large amount of nitrogen is produced, which increases the burden on the kidneys. Excessive intake of protein, especially animal protein, is equally harmful to the human body. First of all, excessive animal protein intake will inevitably consume more animal fat and cholesterol. Second, too much protein itself can have harmful effects. Under normal circumstances, too much protein must be deaminated and decomposed, nitrogen is excreted from the urine, which increases the metabolic burden, and this process requires a lot of water, thereby increasing the load on the kidneys, if the kidney function is not good, the harm is greater. Excessive intake of animal protein also causes excessive intake of sulfur-containing amino acids, which can accelerate the loss of calcium in bones and easily produce osteoporosis.