I believe there are different levels of metabolism and some people (myself included when I was younger) could eat ANYTHING and not gain any fat. Now I wasn't tearing my self down in the gym back then, nor was I eating as often as a hardgainer trying to get big should. But merely stating that I think hardgainers have a fast metabolism and you need to eat to out run it! And I think it's very possible if they are disciplined enough.
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