How to lose weight fast?

I want to know how to lose weight fast if someone willing to share their idea here. Some people saying that it is not good to lose weight too fast, as it might be harm to healthy. I do not know if this real or not but I do wish to lose weight as fast as possible. Of course, I am not meant of lose 10 kilos within a month but 3 – 5 kilos a month would be great. Wonder is this possible.