I've been doing it for some time now (for maintenance) and it works! I find that it's better to do the diet days when at work, because I don't think about food when I'm working. It saved me a lot of money too. I do it Mondays and Wednesdays. I Just have a black coffee in the morning, a banana at 10, an apple and actimel at 1, then just a cup a soup for dinner (plus One or two cups of tea in between). Have to admit though, I've been doing it for some time now, that I become more lenient with myself!

Mind you, I don't advise you do this on its own. When I'm not on the diet days, I run (even just on the treadmill).

Hard to start with, but you'll get used to it eventually. Good luck!