Lactose Intolerance

I finished "Animal, Vegetable, Miracle" a few days ago and was sad to see it go. The book opened my eyes to a variety of things that will change my life, which is an exciting prospect.

One last thought from the book that I found interesting and wanted to pass along was about lactose intolerance. Random, right? Here's the main point: Humans are supposed to be lactose intolerant. For thousands of years we used milk in the early years as an infant, then developed an intolerance to milk as we started eating adult food. However, as humans domesticated milk-producing animals, those adolescent and adult humans that could consume lactose without an allergic reaction would be more likely to survive into adulthood. As those people procreated and spread their lactose tolerant genes, more and more humans became able to consume milk beyond their childhood. Interesting, right?