What does it mean to eat a banana a day?

It means that one day, life will be sweeter than sugarcane. Things are going very smoothly. The source of this sentence can be traced back to a custom in Guangdong. In the college entrance examination, parents will wear a red cheongsam, hold a cane in their hands and hang two bananas, which means "once you have bananas, you will have a good time." This is an auspicious expression. I hope the children will have a smooth exam and a relaxed and happy life.