Hypoglycemic Asians

So many of the Asian people I've known have had hypoglycemia. What this boils down to is the fact that they get grumpy and bitchy when they get hungry. Fishy--himself of Chinese descent, and certainly grumpy and bitchy when he's hungry--recently pointed out that Asians eat a lot of rice--one of the foods they always tell you to avoid because of it's hypoglycemic index (meaning it gives you an energy rush, and then you crash hard afterward). He asked the very interesting question: are Asians hypoglycemic because they eat so much rice, or do they eat so much rice because they're hypoglycemic. I asked the followup question: Maybe they're not hypoglycemic at all. Maybe they're just crashing after eating a lot of high-glycemic foods like rice. Thoughts?