How should I handle this?

I know a guy who smells like garlic. And I mean he ALWAYS smells like garlic. I would imagine that it’s pretty close to

impossible that he eats garlic at every meal, and I’m pretty sure the smell isn’t emanating from his mouth, anyway. I literally have to either back up a little when I talk to him or try not to breath too much. It might be some kind of chemical imbalance or perhaps very poor hygiene or a combination of both. He’s a very nice guy and I wonder whether he’s even aware of the problem. Is this something I can bring up tactfully so that he might possibly find a solution? I once worked in an office where there was a fellow who had terrible body odor. My boss didn’t have the heart to say anything, so he asked me (read: MADE me) do it. PS: The guy didn’t speak to me for a very long time. Should I say something or just shut up and mind my own business?