Data show that exercise works - resistance-training exercise and cardio. (Hormone therapy affects metabolism so, you have to do things that offset that effect.)

I lost 40 lbs (& 3 belt sizes) while I was on ADT due to a rigorous weightlifting and cardio program. The only cost I incurred was that I had to buy a lot of new clothes. I also made some dietary changes, but it was actually to become more heart-healthy.