I have been doing this diet for 6 weeks and in that time have lost 6 pounds. It already doesn't feel like a diet but a way of life, I actually look forward to my fast days to give me body a break from digesting food. I am finding my appetite on non-fasting days is gradually decreasing as I am more aware of whether I am hungry or not. Six weeks into most other diets I have tried I am usually bored and grumpy and ready to give it all in, despite having lost more weight. I would be craving pizza and wine and things, with this way of eating I'm having the things I like if I fancy them and as a results not craving them constantly.
Diets that temporarily change your habits don't work, the weight comes back and usually then some more. Fasting can't be kept up indefinitely so its not a healthy option. Besides I would get too hungry from not eating and then binge eat. So that would make the problem worse anyway.
I really have nothing to gain by trying a fad diet such as the Fast Diet. I simply subscribe to the age-old belief that I simply will try to burn more calories than I consume. If I am able to do so, I will lose weight. If not, I will gain weight.
I was always told by my personal trainer that fasting diets are unhealthy; losing weight should be gradual. I also learned that after the fast diet is over, it is harder to keep the weight off. In some cases, people put on some extra pounds. So I rather would not try this new way of dieting.