Originally Posted by manofsteel
Well I know this is different but George's St Pierre, one of the best MMA fighters of all time and an all around lean and muscular guy, said that he has gained muscle and lost fat while maintaining weight over the past five months from intermittent fasting. He said that he had his muscle and body fat analyzed in January and a few weeks ago showing this improvement. He said his training didn't change. He also said that he does a lot of his training fasted and eats afterward. Not exactly the same as he seems to just have an eating window each day, but still interesting, especially with his fasted training.
So professional athlete, chances that he is natty is between nun and zero.