I burp like a monster on supermarket sarnies, God knows why, but it's always a rocky ride. I might be that bread thing intolerant, in my advancing years, lol. I don't keep bread at home anymore as it's a struggle to get to sleep when you have enough gas to power a turbine.
I find it incredible how calorific most supermarket sandwiches are. Fucking cheese salad and it'll be nigh on 500 calories. WTF?!