Cold food festival is a good time to clean up the stomach. Generally speaking, the first thing for bears in the wild after hibernation is to find some grass to eat in spring. Because grass is rich in cellulose, it is easy to have diarrhea when eaten. The bear cleaned up the waste accumulated in his stomach for a winter before eating. For example, cold rice noodles, a lot of vinegar, and a lot of bean sprouts and shredded cucumber are rich in cellulose, which is most suitable for cleaning the stomach.