I've lost ~20lbs since I first started drinking Soylent. My longest stretch of a 100% Soylent diet was for 2 weeks when I first got it last August. I lost ~8lbs during that time. I was mixing one pouch with enough water to make 4 pints. I would have 1 pint for breakfast, lunch and dinner. So I was getting ~1500 calories a day. From Thanksgiving into the New Year, I hardly drank any Soylent. And the scale was certainly ready to remind of that. I managed to undo much of my weight loss as a result. At the beginning of this year I added exercise to my routine. Since that first 2 week stretch last year, I've gone as much as a week at a time. But typically, I will do 2-3 days of 100% Soylent, then have a solid dinner one night. Some times stuff gets in the way and I'll not have Soylent for a day or two. It varies week to week. I'm a bit of an emotional eater so when things get hectic or stressful, I crave crappy food. So there are days when I've just said "F it... I'm getting pizza." So Soylent is not going to be some magic diet drink that will give you willpower you didn't already have. :)