text: if you work out six days a week and stay on a liquid diet,is it possible to lose 20lbs in two weeks?   ok. i know you're hoping everyone tells you that yes it can work. but don't let anyone fool you, this is not possible. now i dont know how much weight you need to lose, but the more excess weight you carry the faster it is to lose. i'll tell you my opinion based on what i know and people i work with everyday. doing that, which is totally unhealthy, i think you could lose up to 5 pounds in the first week if your body has enough weight to lose(meaning if you are significantly overweight you can drop 5), and the second week you could lose about 4. but the minute you are off this liquid diet most of the weight will come back. so i think you could lose up to 10 pounds at the most but that it will just come back.  you will probably try doing it no matter what answer you get from myself or anyone else. it is unhealthy as you know and this kind of diet will make you very irritable and extremely hungry. a good alternative to try if you really need to diet and fast is to incorporate slim fast into 1 meal a day. it is a good way to control your calorie intake. and if you are going to follow through with this liquid diet maybe you could try and do it on 3 to 4 slim fast drinks daily. that way you will get some essential nutrients while still consuming far less calories than usual. some people will disagree with that advice but the truth is that you are going to try some method of crash dieting wether i tell you this or not. good luck