Serious Eats - seriouseats.com

I did the cleanse for 19 days. I felt great by about the 3rd day, amazing energy, good sleep, clearer mentally and really good workouts. I did speak with a doctor after I had done it and the general feeling is that it isn't healthy. It can affect your metabolism and cause something called fatty liver.

It's recommended that you also drink a laxative tea at night and a saline flush in the am with the lemon drink during the day. You do lose weight, but it is water weight. As soon as you eat, you go back to your normal weight. I am a healthy eater, so I didn't have any ill affects from lack of caffeine, nicotine or sugar. In the end, all it really proved to be was a test of willpower and discipline. As other posters have mentioned, a balanced diet with exercise will achieve better results in the long term.