If you ever wondered whether its possible to lose weight fast (or as they say in Italy dimagrire ) i would answer yes and no. I would say yes becasue if you go under a period of extreme dieting and you do a lot of exercise (taking for granted that you have the energy to do this, that i would doubt) you definetely are going to lose pounds quickly. However, if we look at your body composition after the period, is bet that what has diminished is for the lajority liquids and muscles. Lets face this: fat has 9 calories per gram. Every kilogram you want to lose are 9000 calories. 10 Kilos are 90000 calories to burn. Having a deficit of this kind in a short period of time such as a month is practically impossible. It would be something like 3000 calories a day which is impossible. Even 300 a day can be hard for some people. So id recommend to stop trying to find a quick solution and instead realize that in order to lose weight fast is required a longer period of time and a change of habits.