I once ate a deep dish meatlovers pizza that was 6000. I wasn't even full later. Fat is the missing ingredient. The GOMAD diet will put on pounds unless you are lactose intolerant or allergic to milk protein. Eat exactly what you would otherwise, but also drink a gallon of whole milk over the course of the day. If that seems extreme, double or triple the olive oil on your salad. Drench your pasta in ghee or coconut oil. If your smoothie doesn't have some sort of fat or oil it isn't a weight gain smoothie.