I get it (RH=delayed dumping) with all the same symptoms from:
1. Meals with way too much fat/richness.
2. Cheese/meat boards (too much fat in it and the cheese is an issue)
3. Too many carbs/sugar (real ice cream, desserts, too much sugar free dessert, chips, crackers, pretzels, popcorn, rice, bread, fruit, root veggies: potatoes, sweet potatoes)
4. Hidden sugars in restaurant food
5. Too much alcohol
It's not enough to be a deal-breaker for me. Just gives me extra incentive to eat "on plan" healthy food that is very lean and low. I'm actually very very happy eating this way and don't miss the old ways. I think it's actually developed and gotten worse the further out I am.