I'm the same way; if I am busy I put off eating for hours longer than I should. Unfortunately I find that if I don't eat anything for a long time, I get progressively dumber. I read something that said there's a strong correlation between blood sugar and brain activity, but have no idea if it was scientifically sound. In any case, it seems true for me.

Sidenote: my best pick-me-up when I haven't eaten for too long are Triscuits, with a few glasses of water.