1. There are two Double Ninth Festival diet customs, namely eating Double Ninth Festival cake and drinking chrysanthemum wine.

2. There is a traditional food custom of eating Double Ninth Cake during the Double Ninth Festival. The word "cake" has the same pronunciation as "gao", which also means "step by step promotion" and "longevity of ninety-nine", so "Chongyang Cake" "It is a very popular holiday food. On the Double Ninth Festival, people also drink "chrysanthemum wine". Jiujiu has the same pronunciation with "Jiujiu" and "wine", so the saying that people drink chrysanthemum wine in Jiujiu is derived.