But there's one evolutionary advantage we missed out on that most animals have. The ability for our bodies to naturally create its own supply of vitamin C. We get our fix mainly from citrus fruits, oranges, strawberries, lemons. But we also find vitamin C in lots of other categories of food as well. Now after only a few weeks of depriving yourself of vitamin C, you're going to start to lose your red blood cells. And then your teeth are going to start falling out. Then your hair is going to start to fall out. Then you're going to bleed from your skin, go insane, and you're going to die.