I would say false because losing to much weight to fast could be damaging to you whether as taking it slow and steady is better
Hormones from the stomach are sent to the brain to tell you when to stop eating
No they arent safe to some extent, Yes, famous baseball players have taken steroids one of the reasons they may have been so good, and im not sure about a side affect, they may get addicted, then over use it, and that could have a side affect