To repeat again, only about 30% of Gastric Bypass patients dump to any degree. Back when I had surgery 50% was the quoted rate, but back then the bypasses were a bit more distal which would make dumping more likely.
I am one of the few, the proud, the dumpers! I dump on sugar and fats. Less so on fats. Not enough to dump on cheese, thank goodness.
I am glad I dump as it takes sugar off my menu when otherwise I would abuse the crap out of it. While dumping sounds horrible, it's not quite as bad as it sounds. I don't often dump these days as I have a good sense of how much sugar I can consume when. When I am fatigued, stressed, sick, or in other ways out of sorts I dump easier, so at such times I try to be extra careful, but still misjudge and it get's me. When I'm in public I don't do sugars at all, though I don't do them much anyhow.
I asked my surgeon for a little extra bypass, a little extra restriction, and dumping. 18+ years later I still dump, my restriction is still in place. I have no clue on the extra bypass.
I have dumped on fruit but rarely. My first dumping episode, at about 3 months post-op, was orange juice.
Good luck,
Tek