Actually, it's nothing to be surprised about. The world is full of wonders. This is the colorful world. It's like some people are naturally good at playing basketball, some people are naturally good at writing articles and so on.
You are gifted. There are so many people on earth, so there must be something unusual. Mini's stomach and intestines are also estimated to have excellent digestive ability, so that she can eat so much without getting worse. Perhaps it is a genetic mutation in one aspect, so it is different from ordinary people. Also, it is estimated that she often exercises, and we all know that exercise helps digestion. She may be specially trained and have a unique way to make herself eat so much. She has formed the habit of eating a lot since she was a child, so her stomach can adapt.