I'd like to point out that dr Cohen's diet might be a good diet to follow. Everybody seems to be into weightwatchers, drinking shakes and taking pills you might not want to take after all.
Dr Cohen found out some foods stimulate certain hormones. So he thought of this, by eating certain combinations you would feel happier and more fulfilled, so you will eat less. For the past week, I have found out that it really works. Of course I've not been able to be as strong as I hoped I would be, and sinned a few times against the doc's commandments.
After this morning, I have lost 3.1kg's in my first week, which is a great starter. The reason this diet will NOT stop working after a while is that you will eat just enough for a few days, and then slightly more than needed the other. Your body doesn't get used to a certain rythm, so your metabolism keeps on working just awesome