I had heard it before that, adults generally speaking have issues digesting milk, and outside of that there are lactose intolerant people. Then i recently stumbled across this article, i thought it was interesting. "In what they claim is the first direct evidence of the evolution of lactase-persistence (the ability to digest milk and other dairy foods), German and British researchers came up empty in their search for the gene variant that allows over 90 percent of northern Europeans to gulp down