The fact that a few players are caught and banned for taking 'diet pills' which are an effective masking agent for other drugs, is enough to make a reasoned judgment that players are cycling PED's. A fucking 25 year old athlete with the best nutrition and dieticians, training and money available needs fat burners to stay trim, bollocks.
Yes. You can have all the dietitians, training and money available but you're relying on how far your genetics can take you.
Like I said above, I'm a huge MMA fan and I've seen all these defensive arguments before. People saying there's no way the fighters were on drugs. When the UFC implemented the strictest testing in sports...it turns out a hell of a lot of them were on drugs. Either they were caught or you saw their bodies and performance change dramatically.