I’m surprised none of the responses that I’ve seen so far mentioned that there are and probably have always been a lot of kosher certified foods one could classify as unhealthy, though this post focuses on GMOs alone.
I mean foods and drinks with high sugar content or foods high in fat and salt are obvious targets.
I think the better question comes down to how paternalistic do we want or expect the supervisory agencies to be vs how much choice and control do we wish to retain for ourselves?