Steroids do a lot. Regulating your immune system, blood clotting, behavior and much more.
There is a disease that does what you describe, muscle growth without an effect on the other parts of the body. It’s called myostatin related muscle hypertrophy.
The reason why your muscles grow from steroids is actually the same reason as in the disease. Your muscles will grow without a signal telling them to stop (myostatin). Steroids tell your body to produce less myostatin.
This is also why it’s difficult to do it without the side effects, you aren’t sending a signal to the muscles to grow, that would be easy, instead you have to take away a signal telling them not to grow.
Latest Answers