You don't lose fat "very fast". That's silly to even think. It took you 9 months to put on. You didn't gain it fast, did you? You figure AT LEAST that long, if not longer to lose it. Simple equation. Eat less calories, and burn off more calories. Exercise and healthy diet.
It should not be an wise decision to burn fat at a fast rate. In my opinion it is much wiser and more fruitful steps to lose weight by taking a weight loss program besides the healthy diet and lifestyle modification. To get an effective and suitable program, I would like to suggest you to go through http://healthfulreviews.com and find your desirable one.