People who have had weight loss surgery, including gastric bypass and gastric sleeve, are unable to eat certain foods, drink much alcohol, or consume large portions. Refined sugar and high-fat foods can trigger what is known as "dumping syndrome," which is exactly what it sounds like. The surgically altered digestive tract is incapable of digesting the food, and as a result, the food moves rapidly through the gut, causing painful cramps, vomiting, and diarrhea.

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