Evolution of lactose tolerance
There are many, many web sites out there that will tell you not to drink Milk, for various reasons. If I think about it, yea, it is kinda weird to drink cow-juice... but any more weird than to eat any animal-product? I honestly think the vegans probably are eating closer to what humans historically evolved to eat, and are probably healthier for it, but I'm not vigilant enough (read: I'm lazy, I admit it) to watch my food intake in such a way.
Being of European decent, my mom & grandmom are both lactose-intolerant. My mom only became Lactose-intolerant after I was born. I'm not sure about myself, I haven't always had the happiest tummy, and I've mostly cut out drinking glasses of milk, but my stomach seems to handle milk-products (cheese, sour cream, ice-cream) just fine so far. I wonder if I'll stay that way.