Just found this for you hun on the BUPA website
Is the gastric bypass operation reversible?
The gastric bypass operation should be considered to be a permanent weight loss measure. In exceptional circumstances it's possible to fully or partly reverse it.
Explanation
Gastric bypass surgery is considered to be a permanent weight-loss measure. However, in exceptional circumstances it's reversible, for example, in an emergency or if you experience severe side-effects or complications from the operation. Side-effects can include severe nausea or vomiting.
A full reversal requires another operation on the same, or greater scale, with the same, or greater, risks than your original operation. Because of this, you will usually only be considered for the reversal operation if you experience long-term side-effects or complications.
An alternative to a full reversal which is sometimes is performed is an operation to reduce the amount of your bowel that was originally bypassed. This won't mean that you will be able to eat more, but it will allow you to absorb more of your food.
Overall, further surgery to reverse the operation is performed in less than 2 in 100 gastric bypass patients.
A full reversal of your gastric bypass operation will usually mean that you regain any weight you have lost.
If you are worried about having your gastric bypass operation reversed, or if you are not sure which operation is most suitable for you, contact your surgeon for advice.
Further information
* British Obesity Surgery Patients Association (BOSPA)
0845 602 0446
BOSPA - The British Obesity Surgery Patient Association
Sources
* Surgical interventions in obesity management. Association for the Study of Obesity.
Association for the study of obesity. ---, accessed 31 March 2008