Lemon contains a certain amount of citric acid. When people drink it, it can dissolve greasy ingredients in food and remove fat to some extent. However, its main function is to decompose people's appetite for food. In other words, people can eat less after drinking crystal sugar lemonade, thus playing a role in losing weight. I have experienced it personally. I lost about 5 pounds a month after drinking water girl lemon cream. It turned white.