The only thing that will go towards building muscle is the protein. Your body needs something to burn as fuel that is where the carbs and/or fat come into play. You also need a way for your body to shuttle the protein into the muscles that is where insulin comes into play. This topic people have written books on, just make sure you get plenty of protein with your meals. If you are doing Keto get some good fats for your body to burn, or if not get low GI carbs.
w8lifter can give a lot more detail.



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