It can be, but it's not the only thing that affects it. Also if you shower regularly you can still smell your own BO, and some deodorants are worse than worthless too, I tried one a while ago that I really liked the scent of, but by the end of the day I would reek so bad that I would need to shower a second time to wash it off.

I eat a lot better now too, that might have something to do with it. My partner is the one that regularly comments on how I smell, so my observation was sort of impartial.