But luckily the ring star has can burn through that many calories in about a day and a half of training.
He grinned from ear to ear as friends and family celebrated his big day with a massive chocolate cake featuring sparklers, ten Ferrero Rocher, two packs of Maltesers, 12 Kinder Bueno bars and nine Oreos.
After totting up the numbers, SunSport esitmates the cake comes in at 7,534 calories — around 1,000 calories a SLICE.
Last year, before his bout with Joseph Parker, SunSport revealed how he gets through a 5,000-calorie a day diet including chicken wings, Chinese food and pizza.
And after his comprehensive KO victory over Alexander Povetkin, the heavyweight can afford to munch down on a slice or two of cake.
Anthony Joshua shows off his incredible physique ahead of his bout with Alexander Povetkin
And with a proposed bout against Deontay Wilder on hold while the American faces Tyson Fury, Joshua looks set for a rematch with fellow Brit Dillian Whyte instead.
AJ is renowned for his Adonis body and ripped six pack and shoulders, especially when faced with making weight for a big bout.
Wilder has regularly called AJ out over his next bout, with the American keen to get in a bout next year, but promoter Eddie Hearn is keen to keep a tight rein on his career.
Even former world champ Evander Holyfield is desperate to see the clash happen.
The American, 55, said: "It would be a great fight. When it’s all said and done you’re talking about what’s fair.
"Deontay was the heavyweight champion first, but with Joshua, he’s got all these people.
"I went to Saturday’s fight and there were 100,000 people coming to see him.
"It’s my first time seeing that ever in my life, to see a man, a boxer, draw that many people.
"I still think as a balance, both of them champions, somebody’s going to win and somebody’s going to lose.
"But when both people are that good, that’s when the promoter comes in, brings up the big money and gives everybody even money.
"If you think you’re the champ, you feel that you’re going to win. The whole big thing is what the fight would mean to the individual."
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