Britain's 100m Olympic Gold medalist Allan Wells has denied using performance-enhancing drugs during his career.
Allegations were made by a former teammate in a BBC Panorama investigation.
But the sprinter, who won his gold in the 1980 Moscow games, said it was won with "honesty and sincerity and commitment".
Panorama broadcast an interview with Drew McMaster, who has admitted using steroids in the past.
He said Wells was given the drugs by British team doctor Jimmy Ledingham, who has since died.
In his first TV interview about the allegations, Wells told Sky News: "The commitment that I had was above and beyond anyone else's that I was training with.
"I was taking food supplements, I was taking vitamins, I was taking high-calorie energy sources, and at times I did think I overdid it."
But he repeatedly denied he had taken anything illegal which contributed to his powerful physique.
"I did put on weight, but certainly not as discussed the other night. That was disgusting. I've never been 14 stone.
"It's all about the food supplements and the hard training."
Two of the teammates who helped Wells win a gold in the Commonwealth Games 100m relay have admitted using drugs.
Wells now accepts he does not deserve to keep it.
"I've still got the medal. I'm not unhappy to give it back," he said.
But he is determined to hold on to his Olympic gold.
"I would definitely be unhappy to give it back under any circumstances," he added.
"You know that was won with honesty and sincerity and commitment."
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