Suppressing testosterone nullifies nearly all of the adaptations to strength training. The group whose testosterone was suppressed did not gain any strength, had only half of the lean mass gain and actually gained fat on the weight training regime.
Heavy weight training usually increases testosterone, but these subjects received medication to suppress it. Extremely low fat diets and low body fat levels also lower testosterone levels.
Norepinephrine stimulates a fat cell to mobilize its fatty acids into the blood stream (lipolysis) to be utilized by the muscles as fuel.
Rats were injected with leptin, which induced a reduction in fat pad size without an increase in norepinephrine, perhaps through a different mechanism.
Leptin is a central part of the pathway that signals the brain on the status of body fat levels. Leptin injected into rodents induces fat loss, but does not work the same way in humans due to a more complex signalling pathway.
Resistance training, and other anaerobic exercise, stimulate growth hormone release in proportion to the amount of lactate generated. High repetition sets tend to generate more lactate and growth hormone release.
There also appears to be an improvement in the biological activity of growth hormone post exercise. This is an important aspect that cannot be achieved by just injecting growth hormone.
High consumption of processed meats increases your risk of colon cancer. By processed meats, I believe they are talking about cured meats with sodium nitrite.
Interestingly, fiber intake has not been shown to protect against colon cancer…though it is obviosly important for overall colon health. Regular aspirin appears to be the most effective preventative treatment available.