Ok...I know this may sound like a dumb question but I've noticed that many say that between cardio, weights and diet, that a clean diet is the most imortant factor in building muscle and maintaining a good physique. (Correct me if I got this wrong). What I'm asking though is, isn't a calorie just a calorie? If you don't consume more than what you need, you won't gain weight so what does it matter where the calories come from? Does this make sense or am I totally out in left field?

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