I've been doing it for a couple of weeks now and while I obviously can't speak to long term results, I can say I find it easy to follow and it comes without any of the worry or self-nagging that comes with most other diets. I would guess my calorie intake is somewhere around 60% of what it was before, and like the GP I just drink tea/coffee on off days. I don't find myself becoming insanely hungry, either.