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There have been innumerable studies of this sort done both in animals and in humans (mostly in elderly people). You can find them on MEDLINE, after all. The physical capacity and the amount of lean body mass improves even without any physical loads, and even with steroid doses that would be considered pitiful by most bodybuilders.

Personally, I think that the importance of diet is exaggerated. Naturally, you must eat a lot of proteins and carbohydrates, not much fat, but the question is if the amount of protein that is usually recommended (as much as 3 g/kg body weight) is really used by the body.

Consider the amount of clean muscle you gain with Anavar or Winstrol - it is few pounds at best. Even if you gained 2 kg (4.4 lbs) of clean muscle after 6 weeks, this corresponds to 50 grams (0.12 lbs) of protein/day above your normal nutritional needs. Thus, in theory, roughly 150 grams of protein/day total should be entirely sufficient for a bodybuilder weighing 100 kg/220 lbs (=1.5 g/kg/day). Well, a bit more protein can be better, because some protein is degraded by training, but don't tell me, please that 2.5-3 g/kg/day will be somehow efficiently utilized!

Recently, there was a very interesting study that addressed this problem:
http://www.ncbi.nlm.nih.gov/pubmed/1...m&ordinalpos=1
It turns out that at least in people, who don't take steroids, protein intake has a limited impact on anabolic effect. After you get over ca. 1.5 g protein/kg/day, there is no further increase of lean body mass. What is decesive, however, is the amount of calories (or carbohydrates, respectively) you take (probably because of the anabolic action of insulin, IGF-1 etc.). But it has its own drawbacks, of course, because you will become fatter. I suppose that when you take steroids, the additional anabolic effect of high carbohydrate diet is minimal, and it will bring you more fat than muscle.

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your internet research is pretty flawed just a fyi, I think you need to keep learning you got long ways to go.