Hoodia is an all natural weight loss supplement. NOT A DIET PILL! I don't take pills. Hoodia stopped my appetite cold. No cravings, no desire to cheat on my diet. It works as well as or better than I ever imagined. As far as inverting of course it's probably a better idea to eat when you're not full but I don't know that you have to wait any number of hours like swimming or whatever. I do it when I need it, y'know like if I feel a spasm coming on or a little tweak in my muscles and probably if I figure I'm going to invert then I'll adjust meal time around that.