(In the latter case, eating small meals regularly tends to help a lot; a lot of people diet by eating less frequently instead of smaller portions).

I'm supposed to do this anyway: it helps with irritable bowel syndrome, which is supposedly what I have since I don't have celiac apparently. If I go for more than 3-4 hours without eating (unless I just had a massive meal, in which case it takes that long to digest), then I get crabby, I get stomachaches, and eventually I'll start getting dizzy and weak. I had a 5-hour straight shift of teaching lessons at the pool one semester and it was a nightmare...by the end I would be ready to pass out climbing out of the pool.