I'd often wondered about the very high incidence of lactose intolerance among orientals and the lack of diary products in Chinese food. Clearly, that's no coincidence but what, I wondered, is the cause and what is the result? Now, it seems we know. The intolerance dictated the diet and not vice-versa.
Yes, although my friends who drink soy claim it's for advanced cultural, enlightened, transcendent, open-minded reasons...