How can Carnie Wilson’s weight gain be explained? She had weight-loss surgery and lost a lot of weight. In fact, Carnie Wilson’s weight loss after the procedure was an example of how weight-loss surgery can and does help people lose a pretty good amount of weight. But did you know that a certain number of people gain weight after weight-loss surgery? One in seven – or about 15 percent of people gain weight after gastric bypass, and Carnie is one of them.

The reason why she gained weight has to do with the fact that weight-loss surgery cannot prevent a person from eating unhealthy food. It can only limit the amount of food one eats. It also does not fix any psychological issues a person might have. For example, if you eat sweets when you get stressed about something, you will eat sugary snacks regardless of whether or not you have had weight-loss surgery.

The good news is that Wilson is trying to lose weight again. She follows Dr. Oz’s weight-loss program and has already lost 6 pounds, which is not much, of course, but better than nothing. She wants to be between 150-to-170 pounds. To get there, Dr. Oz told her that she needs to exercise every day for about 30 minutes (she has to walk 10,000 steps), and she needs to clean up her diet by dealing with her addiction to simple carbs. [source: People]