An exercise scientist told us how many pounds you should lose each week if you want to keep it off

Flickr/Nathan Rupert Dieters beware: Not all weight-loss plans are created equal, and for some, timing is key. You might be enticed, for example, by a diet that claims it can help you shed 20 or 50 pounds in a couple of weeks. But shedding pounds too fast can be a red flag for a diet that might encourage unsafe behaviors. On the other hand, losing weight too slowly might be discouraging and make you want to give up. So how much weight should you lose each week if you want to keep it off? We aske...