If you ask the average gymgoer what single physical factor most affects muscle growth and fat loss, they would probably answer “testosterone levels.”

And they’re right.

Testosterone is certainly a primary hormonal driver of muscle growth. Research has shown that anabolic steroids, which drastically raise testosterone levels, given to even young, healthy men can induce muscle growth and fat loss without any exercise whatsoever.

Thus, it would be fair to assume that the higher our testosterone levels are, the more muscle we build and the leaner we get, right?

Well, this is where things get interesting.

Let’s dive in.

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