In gastric bypass patients and less frequently in patients having had the Vertical Gastric Sleeve (VSG), dumping occurs when sugary or fatty foods are eaten too much or too quickly. When overwhelmed by these foods, the pouch (stomach) dumps the food into the small intestine before it’s properly broken down. That creates pain, discomfort and sometimes unpleasant and difficult side effects. Dumping syndrome can result in nauseousness, cramping, diarrhea, sweating, vomiting, or an increase in heart rate and even loss of consciousness. These symptoms usually lessen after one or two hours.