This is the same for me. Went to france, ate what I wanted, white baguettes in abundance, rich food, wine every night and all good, living my best life. Came home, tried to eat brown bread and rice = gas and bloating all week. It could be because you've added in more fibre than usual? Or it could he what my colon doctor says in that not everyone's digestion suits a high fibre diet and for some people, they respond better to low residue food that passes through quickly. My gut has definitely changed over the years, can't do dairy anymore, I've become one of 'those' people who ask for weird coffees and pore over menus. After getting caught short once in a restaurant where the sauce my prawns were cooked in included cream, i dont take risks when eating out anymore, well except in France 🤣