I'm also interested in the drop out rate as I get more and more involved here. For me, and others perhaps, I think a lot of it boils down to planning. If you're doing low-carb correctly your hunger is under control and cravings are non-existant most of the time and are at least under control as well. But if you get stuck in a situation without your foods or make one mistake that can send you off into a cheat. And once cheated a lot make the mistake of having another cheat, another cheat, and it snowballs into going off plan and staying that way.

I was once at 303 (at least) and worked my butt off for a couple of years to lose 80 pounds doing low calorie and exercise. I always felt deprived and I always felt hungry. It was horrible.

On low carb I never feel deprived, for the most part, and the hunger just isn't there. I feel satisfied while losing weight - something I never thought would be possible.