In a video that has emerged on Twitter, Joshua says eating Pounded Yam, Eba and Egusi is the secret of success.
The Nigerian born British boxer last weekend defended his IBF world heavyweight belt thanks to a trademark knockout of American challenger Dominic Breazeale.
Unbeaten heavyweight champion Joshua, 26, floored Breazeale twice in the seventh round before the referee waved off the bout as the British star improved to 17-0 with a 17th knockout in London on Saturday.
It is his first title defence since dethroning Charles Martin in April.
In a video that has emerged on Twitter, Joshua while responding to some questions about his mother land, Nigeria says eating Pounded Yam, Eba and Egusi is the secret of success.
Joshua was born in Watford to a Nigerian mother and father. He grew up for much of his early years in Nigeria before returning to UK.
Speaking to BBC Sport, Joshua says he stays very much in touch with the Nigeria culture and hopes to fight there one day.
“I have Nigerian parents and I’m still very in touch of the culture as well,” he the 26-year-old.