How proteins are digested and metabolized in the body.
Digestion of proteins begins in the mouth by mastication; the medical term for chewing in which we are breaking it down smaller to help with digestion and absorption. Creating what is called the bolus and is swallowed down the esophagus and enters the stomach where most of the digestion of protein happens.
Enzymes called pepsinogen activated by hydrochloric acid turns into pepsin and is responsible for protein digestion which needs HCL that makes your stomach acidic to activate pepsin. The whole process is controlled by a hormone called Gastrin; (which is stimulated just by thinking, smelling or tasting food) by releasing pepsinogen and HCL. While the pancreas releases protease and peptidase continuing to break down amino acid chains into shorter sequences to be absorbed into the bloodstream into the liver through the portal vein where amino acid metabolism occurs the most.
Amino acids are absorbed by the body by a measurement called Biological Value from various foods make up of proteins and the amount of nitrogen it released since carbs and fats don’t contain it. Then the Net Protein Utilization (NPU) takes it a step further. It uses the BV and adds in the digestibility of particular food and how efficiently it can be used in the body.
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