Got milk? More than likely, you can't digest it. Mark Thomas of University College London's dept of Genetics, Evolution and Environment released his findings in a paper (read more here)
that says adult humans have a hard time with milk. More specifically, many of us can't digest the main sugar in milk, lactose. (Only 4% of us are actually allergic to milk.) As a result, the enzyme that's supposed to break down it down—lactase—stops being produced when the person is between two and five years old. The undigested sugars end up in the colon and begin to ferment, producing gas that can cause cramping, bloating, nausea, flatulence and diarrhea. What's also interesting is that the likelihood to digest lactose differs by ethnicity. Those that can break down lactose are as follows: nearly 0% of Native Americans, 5% of Asians, 25% of African and Caribbean peoples, 50% of Mediterranean peoples and 90% of northern Europeans. So, if you have trouble putting down a glass of milk, you're actually normal. The really bad news to all of this is that we'll have to figure out what to do with our cookies.