What diet is best to lose 20 lbs within 30 days?

purge is your only option or just stop eating like you are doing...1000 callorie diets are dangerous because most women need 1400-2000 each day to FUNCTION...your gonna kill yourself in the end....and they are not healthy those 600 call diets you are talking about and think about it...once you lose all this weight (which is muscle) once you start eating it will come all back as fat...just leting you know