Although a theory has been passed down that the tradition of eating eel kabayaki in Japan on the midsummer day of the ox began during the Edo period was spread by Gennai HIRAGA, this is not confirmed.
日本で土用の丑の日にウナギの蒲焼を食べる習慣は江戸時代に平賀源内によって広まったという説が伝わっているが定かではない。