Considering I can't leave the house until I've had a bowl of Kellogg's and a milky brew, I should probably be aware that 60 percent of humans can't properly digest milk.
In fact, no other species but humans can. Why did nobody ever mention this?!
Apparently, fewer than 40 percent of humans on earth can digest lactose post-childhood and only 5 percent of Asians and 25 percent of African adults can properly digest milk.
According to USA Today, your body does not want you to be ingesting milk as an adult and tries to give you a heads up by giving you diarrhea.
“Instead, people who are lactose intolerant can't digest the main sugar lactose found in milk. In normal humans, the enzyme that does so lactase stops being produced when the person is between two and five years old.
“The undigested sugars end up in the colon, where they begin to ferment, producing gas that can cause cramping, bloating, nausea, flatulence and diarrhea,” they said.
Being able to digest milk is so strange that scientists say we shouldn't really call lactose intolerance a disease, because that presumes it's abnormal. Instead, they call it lactase persistence because we just shouldn't be drinking it.