em, constipation, or at least some intolerance to the porridge / oats?
I have found one of the few foods I can’t eat (*) (other than liver and other offal, haggis is OK) are bananas – make my stomach cramp up something horrible about an hour after eating them. Quinoa in anything other than very small amounts can do the same.
* others being marmalade, baked beans and most kinds of tea.
[Edit: it does drift over time, time was I couldn’t abide tomato juice, black pudding and likes of beef olives either. I suspect it was just rubbish ingredients at the time, a decent black pudding is unbeatable now ]