Hey Bob. Yeah, I agree. Exercise studies look at "responders" and "non-responders." How good our bodies are at maintaining a particular weight, whether they overrespond to certain foods, I think is variable.

I think one thing that might be left out between now and then, looking at whether previous generations were more active, ate more than us etc. is sort of how busy we were, and how that affected access to food. During the work week, I'm a lot more active--but with getting to and from work and work itself, that's a good ten hours or so where usually I just don't bother to eat. I work nights, usually do all my eating before work. On the weekend, I'll usually eat more. Mostly for entertainment purposes, but I also think I personally experience a bit less of an appetite when I keep busy.