Sometimes, even the self can't really tell. At one point, I'd reached 235-240 pounds and didn't even know until a health screening at work revealed it to me. And when I started talking to people about it, they weren't surprised. I got around to working on it. Today, I tend to maintain a range of 190-200 pounds. Wish I could get to 180, but I'm still pretty lazy, and that would pretty much be the lowest I could go at my height without malnourishment.