Confession: I have a tendency to think there is ‘One Right Answer’ to life’s big questions, and surprisingly enough (!), I often feel like I have that answer. However, I also know that it is utterly preposterous to think I actually have the answers to everything. On the contrary, I only know a tiny smidgen of all that’s to be known and understood in the universe, and things in life are rarely black-and-white. So, my ‘know-it-all’ self and my ‘I-don’t-know-jack-crap’ self are in constant battle. Sometimes it’s a bit exhausting to be arguing with one’s self all the time, but then again, it keeps me from getting bored!
So, that’s confession time out of the way. Now on to the more interesting stuff.
Recently I came across an amazing article about the evolution of adult milk drinking. Yeah, doesn’t sound that amazing probably, but trust me, it is. In a nutshell, for most of human history (or perhaps I should say pre-history) adults of our species could not really digest dairy, but somewhere around modern-day Hungary, perhaps about 11,000 years ago, there was a genetic mutation that kept that childhood milk-digesting ability working into adulthood, and that mutation was so advantageous for those who inherited it, that it spread like wildfire!
Still, about two-thirds of people currently living on the planet don’t handle milk so well… as in, drinking milk causes diarrhea and unpleasantness like that. However, the other one-third (roughly) can digest milk and it provides a valuable source of energy and nutrition. In some places, particularly in northern Europe, the percentage of adults who can digest dairy is up to around 99%! So, that’s a very brief run-down of the idea, but I highly suggest you check out this great article that explains it much better than I just did: Archaeology:The Milk Revolution (from nature.com).