Dumping is a syndrome that may occur following gastric bypass surgery. Often it is discussed in relation to RNY but it can occur with other bypass surgeries. Not everyone dumps. When part of the intestine is bypassed, sugar and fat are digested differently. The digestive tract can handle small amounts but if you over load your digestive tract dumping may result. Dumping may include any or all of the following in no particular order: dizziness, weakness, nausea, headache, sleepiness, foaming, vomiting, sweating, hot flashes, headache. I dumped once after sipping water immediately following a few strips of bacon. Half an hour later, the world was spinning and I was hot flashing. After forty-five minutes sitting with my head between my knees it began to pass. This was about two months post op RNY. I now place my liquids out of reach until 30 minutes after eating. I never want to experience this again.