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When you eat protein-containing foods such as meats, fish, eggs, cheese, nuts, and plant foods, as we mentioned, proteases and other enzymes split up the big block of Legos into their separate amino acids, which can then be absorbed in the small intestine and released to the liver and bloodstream.
The body can do a number of things with these amino acids, depending on your physical needs:
The cells can take them up and use them as raw ingredients for proteins.
The liver can make glucose out of them for energy purposes, in a process called gluconeogenesis.
They can also be stored, after conversion by the liver to glucose or lipids, as glycogen (i.e., muscle fuel) or fat.