I know that (explained like you’re five) carbs are the fuel we use for energy. And fat is somewhat the “emergency” fuel. But what is protetin? What’s the purpose of protein? Why do people who want to bulk eat a bunch if protein?
In: 5
You are correct about those being the three main macronutrients. This is all pretty simplistic, but it should give you a basic idea of how they are used.
Carbs and fats are equally used as fuel. Fats are better for long term fuel, because carbs are used up pretty quickly.
Proteins get broken down into amino acids, and these are used to make everything in your body. They get built into new proteins, and are used from everything from starting chemical processes, helping cells communicate, transporting things in the body, building new cells, etc. They can also be used as an energy source if needed.
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