By Lisa Rapaport (Reuters Health) – A common weight loss surgery is associated with long-term gastrointestinal problems and food intolerance, a recent study suggests. Researchers examined data on 249 extremely obese patients who had what’s known as laparoscopic Roux-en-Y gastric bypass, which reduces the stomach to a small pouch about the size of an egg. “It was already known from previous studies that the Roux-en-Y gastric bypass might aggravate gastrointestinal symptoms after surgery,” said lead study author Dr. Thomas Boerlage of MC Slotervaart in Amsterdam.