If you want to know the real reason why the bodybuilding program you are on hasn't worked for you read this well researched article...

Want More Muscle? Then You may need to eat more fat. results from several studies indicate that a diet high in fat,particualrly saturated fat, increases free testosterone levels.

Early investigations ( 1-3) demonstrated that switching from a high fat diet ( 40 - 41%) to a low fat one ( 19% - 25%) causes free and total testosterone levels to fall in healthy men. The men went from their regualr diet to one that contained less fat and a higher polyunsaturated/saturated fat ratio.

Vegans who consumed less fat, also exhibited lower concentrations of testosterone than omnivores.(4).