How do French Women (and French Men) Diet?

After having living in France for a few years, I’ve noticed that a number of French women use pills to lose weight. So much for the cabbage soup method.
Some women eat green beans. Some women are trying fasting (but I think this is relatively new).
Men who diet in France ( and they do!) give up eating bread, or they eat much less bread. During the week, they eat fish and drink no wine, but they will always have a good meal with friends on the weekend.