I was told 11 years ago, that I would be better, having chronic fatigue, that having a gastric by-pass would make it better. It certainly does not. The hormone that is in your stomach, as with the duodenum, gets by-passed. So, you have a lot of episodes of shaking and hypo-glycemia. It DOES NOT make your chronic- fatigue better. In fact, it makes it worse!! I am proof positive. Please understand that I'm not saying a by-pass is bad, but if you have chronic fatigue it does NOT make it better. So be aware that you will have to eat. I have gained 35 pounds back. That's not good. I have to find some other way to help balance the hypo-glycemia that is a result of chronic fatigue.