As far as I can tell all fitness blogs say you have to eat lots of protein to build muscle (with exercise). But why protein specifically? If excess calories from any macro can be converted to fat by the body, why do we need protein to build muscle? Couldn’t the body just use excess from any macro combined with weight lifting exercises to build muscle ?
In: Biology
It’s about raw materials. Your body needs the building blocks, but it’s easier to get them from some things than others, and some of them can’t be produced locally at all, they have to be imported. It’s also about volume, you need to make sure you have enough available to satisfy the demand.
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