Todd Moody wrote: >Good point. We can't answer this without answering the question >"How old is old enough?" I don't expect there will a simple >answer to this question anytime soon. Neither do I. However, for what it's worth, a friend of mine contacted several nutritional anthropologists (only a handful exist in the U.S.), and the consensus was: A minimum of 5000 years is generally needed for (not necessarily complete) adaptation to a change in diet. Cheers, -- Aaron Wieland