When I break my fast, if I have certain foods, I feel pretty crappy. My heart pounds/races and my brain is extremely foggy for an hour-ish. Much more extreme than any post-prandial slump I've ever had.
So far I've correlated these foods, I *think*, to those which are high GI. Rice, apples, and wheat so far. If I eat only my favorite break-fast (avocado and bacon and maybe fried eggs), then wait a while, I can then eat these "trouble foods" in moderation without too much trouble.
So I have begun to theorize...is this an insulin spike? IE, the food intake spikes insulin but the food hasn't actually gotten to the blood yet, so it crashes my blood sugar? Or could it be that my stomach is just working really hard and demanding all the blood? Or do I possibly have a mineral/vitamin deficiency of some sort?
Obviously this is a case of "well, don't do that then!". ;) But I am curious whether this can tell me something about my general health.