I second what UpDownAround said about MyFitnessPal. I think the goal of different diets is to make eating less and possibly at the same time exersizing more to be attractive to others. Unless you are a person that has steel-like discapline, you may only lose a couple pounds a week. This is IMHO a healthy way to lose weight. As an exception to regular dieting, I like Weight Watchers because everyone there shares their successes and temporary failures. In this way, they provide emotional support, which I can see that many need in order to motivate themselves to follow the plan.

FWIW