i also find that i get seriously exhausted after medium to large meals that include rice (Indian and Japanese food). I mean completely wiped out. I've always wondered what was wrong with me. I knew it wasn't just the amount of food but the fact that included rice. I found an idea on the net, implemented it and it worked. basically someone suggested having a bit of fatty food afterward (perhaps my body is so used to high amounts of fat that it kind of rebels when i surprise it by eating lots of rice and little fat). so i was nodding off at work after a medium-sized sushi meal. i had a few pieces of pepperoni sticks (Oberto) and some cheese and i almost immediately snapped out of it. haven't tried it a second time though.