to late for me to get into details but here are some basics:
protein(s) are used to build & repair muscle tissue, tendons, ligaments and soft connective tissue
carbs are the main energy source when the body is physically active, running, lifting, when you are truely exerting yourself
fats are the primary energy source when the body is a rest (sitting, sleeping, desk work, walking, etc.). the brain is also comprised mainly of fatty tissue(s) fatty acids and cholesterol is used to manufacture the cell membrane of all cell structures in the human body



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