It isn't. But change like that is exactly what you need to do. If it's good or bad to change it via a drug instead of mental discipline is another question.

But you could change your food and eat tons of it. I am a pretty slim person and i eat a lot compared to my friends. I also don't do much sport and as a developer is sit a huge part of the day. So for me it comes down to WHAT i eat and it's serving me pretty well. You don't need to fight your appetite, you can serve it and still loose weight.