It will fill in again to an extent. If you tend to lose weight in the face first, like I do, it can seem scary. But then when you get to your goal...which might be slightly heavier than you may have been shooting for in the past...you go onto maintenance and eat a little more and the face fills in first...for me anyway. But you also have to make friends with it a little bit and use your sense of humor because we can't go back. I'm gonna shoot for healthy, happy and pleasantly plump. That rocks!