Is there a good diet for rapid weight loss?

None, really: Not even the most recently released med for weight loss is a "magic bullet". The real secret to weight loss is healthful meals (lean protein, goods fats, low glycemic index carbs, colorful fruits & veggies, whole grains), portion control (use salad/dessert plate instead of dinner plate; no refills), & exercise to burn off calories. Support groups like weight watchers can help motivation.