Weight gain after Roux-en-Y Gastric Bypass surgery : Is it possible?

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Weight gain after the Roux-en-Y gastric bypass surgery is not guaranteed since there’s a good chance that it will occur to some extent. In this post, you can find out how likely you are able to experience the weight gain and how to reduce your chances.

What is the average weight gain after gastric bypass surgery?

The average excess weight loss post the Roux-en-Y gastric bypass surgery is almost about 70 percent and many patients have seen the results over 80 percent. It has been seen that most patients keep at least 50 percent of their excess weight off even after ten years. But once you reach the low point, will you start heading in the opposite direction.

As many as about 80% of the patients will eventually gain a little weight after hitting their nadir. Additionally, as more time passes following the surgery, the patients are more likely to gain back some weight. The patients are able to keep at least 50 percent of their excess weight off post ten years.

Factors of Weight Gain after Roux-en-Y Gastric Bypass surgery

There are many factors that are more likely to lose less weight or gain the weight back post Roux-en-Y gastric bypass surgery. These include your weight before the Roux-en-Y gastric bypass surgery as this will not only reduce the risk of complications post surgery but also lower your BMI before the surgery. The more weight you are likely to lose the less likely you will experience any weight gain post Roux-en-Y gastric bypass surgery.


Substance abusers i.e. alcohol or drug abuse are more likely to revert back to their old habits post surgery. All these factors can lead to significant complications post Roux-en-Y gastric bypass surgery. Lack of support system in form of family and friends or the weight loss surgery support group and lack of ongoing lifestyle counselling through the hospitals or doctor based support group can also lead to complications.


Increased food urges or decreased feeling of wellbeing post the surgery are directly correlated with weight gain post Roux-en-Y Gastric Bypass surgery. Among the mentioned factors the psychological state following the surgery that is the food urges and feelings of well being are either partially or completely resolved after surgery.

How to avoid weight gain after Roux-en-Y gastric bypass surgery?


Considering a little bit of weight gain post Roux-en-Y gastric bypass surgery is likely to occur after you hit the lowest weight. Here are some ways to keep the weight regain to a minimum. You should join and participate in a good weight loss surgery support group since patients who actively participate have roughly about a 10% of lower BMI than patients who do not. Stop binge eating well before the surgery since patients with binge eating disorders tend to lose less weight post surgery. Seek treatment for BDE before surgery so as to reduce your likelihood to gain weight after Roux-en-Y gastric bypass surgery.


Address the alcohol and drug abuse issues as this will help to prevent the weight gain post Roux-en-Y gastric bypass surgery. This topic is usually considered in your psychological evaluation before the surgery approval so be prepared with honest views when working with your psychologists so that they could help to get your problems under control. Lose as much weight as possible before the surgery since the percentage of patient’s who keep of at least half their excess weight ten years post surgery is almost about 15 percent higher for those who are morbidly obese.


Continue getting the nutritional counselling and also address the food urges as well as lack of well being state if you experience it immediately post surgery. Also consider pouch connection size and talk about resizing or tightening with your surgeon. Follow the advice of the bariatric surgeon. It is obvious to follow but there are many patients who do not follow their doctor’s order for the first one to two years and slowly they start to falter. Therefore it is important to choose the best bariatric surgeon who are trained and experienced to help patients keep off the weight for long term post Roux-en-Y gastric bypass surgery.

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