I do not know why, but 6 pounds has become a popular number of pounds to lose and the faster and easier the better.
Of course, the desire to lose fat fast is very understandable, especially if you have a big event you wish to become slim for. It would've been better if you had all the time you wanted to lose 6 pounds, but if you're in a hurry, let me suggest a couple of ways in which this can be done.
Lose 6 lbs in 3 days to a week
This is not something which is all that easy to accomplish but it is very possible and has been done many times before. In order to do this I suggest that you use a detox based diet which will just flush out of you a lot of undigested weight. This kind of weight loss does not have to stop at 6 pounds. You can well lose more if you wish. But if you have only 3 days to a week to do this, than this is the kind of diet you should use.
If you do choose to use a detox type diet, I suggest you give the Master Cleanse program a try.
Lose 6 Pounds in 10 Days To 2 Weeks
If you have a little more time to lose 6 lbs, I suggest that you use another weight loss method: the calorie shifting method. This is a method which can lead you to lose up to 9 pounds in 11 days. I know this for a fact since I spoke with dozens of people who have used this program and who got this kind of result. Calorie Shifting, which is better known as the Fat Loss 4 Idiots diet, is easier to do than the Master Cleanse diet, but it provides slightly slower results.
You should choose the diet plan you wish for according to the time frame you have to lose 6 pounds. I wish you the best of luck.