hi sleepy -
dumping happens to people who've had gastric bypass. because we don't have a pyloric valve, everything we eat sort of squeezes through the outlet of the pouch into the duodenum [think TOOTHPASTE]. sorry for the visual.
now, if we eat a lot of sweets or fats [or both!], this load of bad-for-us food kicks off an immediate physiological response that involves insulin and a number of other digestive hormones. people's symptoms differ, but can include sudden, explosive diarrhea, fever, feeling like you were just hit incredibly hard by the flu, dizziness, nausea, and a few others. and it doesn't pass quickly.
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