Why do you always have a single eyelid and double eyelids?

Exercise. Reducing fat, the reason why the eyelids are single is because there is more fat in the eyelids, which is a link of Mongolian genetic mutation. The increase of eyelid fat ensures that sleeping in extremely cold conditions will not cause eye frostbite. If it is a single pair, it means that there is a double eyelid gene. If the other one is single, it only means that there is not enough fat. When I was the fattest in junior high school, I was fatter than me. Obviously, I lost some weight after I was single, and my eyes became this B-shape. It was about that time that I began to pay attention to this problem. Finally, I lost weight for three months, and I lost some weight, and it became like this. So it is good to lose weight. Let's go