Fitness enthusiast Dean Wharmby, 39, from Rochdale, died in July after a five and a half year long battle with with liver cancer.
Doctors found a tumour too big to operate on in his liver in November 2014, which he blamed on diet of junk food and energy drinks.
However, according to AsianTown, coroner Lisa Hashmi said the 'direct cause' of his death was due to steroids.
To obtain the perfect bodybuilder's physique, Wharmby survived on a 10,000 calorie a day diet of burgers, pizzas and bacon sandwiches -- with seven to eight cans of energy drink.
He also took anabolic steroids to boost his energy and sculpt his muscles.
At his inquest Mrs Hashmi said Mr Wharmby's death should serve as a reminder to people of the dangerous of using steroids.
She said: 'I find on the balance of probabilities that in such a fit, health-conscious young man the most probable cause of his liver tumours was the misuse of anabolic steroids.
'To my mind, there is a direct, causal link with Dean's death.
'Dean's death and the precious loss of such a young life in such circumstances ought to send out a very clear message to all those involved in the body building and fitness industries.
'Use of anabolic steroids, which is apparently rife throughout, is not without inherent risk.
'I would urge all those using and abusing such drugs to reconsider their position and ask whether it is really worth it given the life-threatening risks.'
His partner Charlotte Rigby said that when she first met Dean eight years ago, she had suspicions he had used steroids because of his muscular build, but said when they got together in 2010, he was trying to stop taking the drugs.
Mr Wharmby had been a bodybuilder for 20 years before he became ill.
In the beginning, he admits to taking steroids for about a year to create his physique because 'everybody did it'.
Mr Wharmby found the energy from seven to eight cans of energy drink while eating every two hours.
And while some of it was typical bodybuilder fare - protein shakes, eggs and chicken - other bits were less conventional.
Mr Wharmby would grab a McDonald's for a snack, and a pizza on the way home - which he would eat while his girlfriend of five years cooked dinner.
He leaves behind one child.