How does digestion work? Respectively, what part of food gets turned into ‘energy’ and what part is used as a building block?

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E.g. when eating a steak, there are proteins in it that one needs to build muscle. My question is, does all of that protein go towards building muscle, or does a part get turned into ‘energy’ or something else?

I’m asking as when I read the nutritional information of some protein powder, they had quite a massive amount of calories. There I realised that I actually have no clue how all these things relate to each other ><

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The fat, carbs, and proteins you eat slowly get broken down into smaller pieces starting in your mouth all the way to your intestines where most of the absorption of these nutrients happens. The amino acids you get from breaking down proteins can be used to generate energy, make hormones, build muscle fibers, and a bunch of other things.

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