It really is different for everyone. I found that milk protein was actually the lynchpin of my diet troubles. But both our medical practice and food culture don

It really is different for everyone. I found that milk protein was actually the lynchpin of my diet troubles. But both our medical practice and food culture don't speak in terms of food sensitivity outside of "you swell up and die immediately". There are lots and lots of bad things that can happen that don't involve swelling up and dying.