A 36-year-old Belarusian national dubbed the world’s 'most monstrous bodybuilder‘ has reportedly died after suffering a heart attack.

Illia ‘Golem’ Yefimchyk ate seven times a day and consumed 16,500 calories, including 108 pieces of sushi and 2.5 kilograms of steak.

Known as the ‘340lbs beast’ and also The Mutant, he stood 6ft 1 inch tall and boasted a 61-inch chest and 25-inch biceps.

He reportedly suffered a heart attack at home on September 6, while his wife Anna performed chest compressions as she waited for the ambulance.

The bodybuilder was flown to hospital by helicopter.

‘I prayed all this time, hoping that Illia would recover,’ Anna told Belarusian local media.

‘I spent every day by his side, hoping, and his heart started beating again for two days, but the doctor gave me the terrible news that his brain had died.’

She said after his death: ‘I thank everyone for their condolences. It’s very heartwarming to realise that I am not left alone in this world, and so many people have offered me help and support.’

Russian newspaper Kommersant reported: ‘On September 6, the athlete suffered a heart attack and fell into a coma.’

His death was confirmed on September 11.

Yefimchyk impressively achieved lifts of 600-pound bench press, 700-pound deadlifts, and 700-pound squats.

While not competing professionally, he became iconic on social media with more than 300,000 Instagram followers with fans seeing him as pushing the boundaries of human capability.