When men begin to build their bodies, it's often never enough. They want to see their figure growing stronger, muscles bulging out of every corner. The results they witness are never enough. They want more. Bigger. Stronger. Nothing regular nutrition can give them, making them turn to the black market to find other supplements they can use to gain.
They don't care about the side effects, pouring as much of the protein and mass gainer shakes into their mouths as they can handle. They don't see the amount of fat they are packing onto their bodies, only muscles pumping out of their shirt as they bulge bigger and bigger. They don't notice their huge belly hanging on their fronts covering their growing belt line or the second chin wrapping around their neck.
All that matters is that their body continues to expand, growing bigger than it has ever been. Every morning they get up, seeing their rounder figure taking up more of the reflection and feeling a sense of pride in their success washing over them. They don't notice their loose chest or their lack of definition, only a massive beast of a man. Even then still, no amount of growth would ever be enough.