Well duh!
Best parts are 1) that many of the "food intolerances" sound a lot like dumping and were NOT correlated with amount of weight loss. We've known this all along, that dumping is NOT a weight loss tool, just a very unpleasant side effect of certain types of surgery on the stomach, including gastric bypass. Yet some surgeons continue to sell gastric bypass as the best surgery for people with a sweet tooth, and patients, sadly, believe their surgeons.
2) the comment at the end of the article by a bariatric surgeon not involved with the study that the results are not surprising. She's absolutely right. The side effects of gastric bypass are very well known.