Many people lose about 1lb per day and it is great to jump start a diet b/c for me it reset my taste buds and made me WANT to eat more vegetables! If that isn't great for diet & health, I don't know what is! hee. ...so you may gain a few back after but most or all the weight you can keep off if you keep a very good diet afterwards, i.e. mostly fruits/veggies. Good luck and good health to you.