What is going to happen when , in a number of years, we find out (with the help of new technology) that our bodies has been affected by cosmic radiation?
The airlines will point to the old regulations that they have complied with and wash their hands of you. The health systems of the world will spend as little as possible to help you, relying on the fact that the longer they procrastinate, the fewer and cheaper it will be to treat you. It is a tough old world out there. Personally, if I'm planned at a high level at a fairly high latitude, I get them to run the fuel plan again at a lower level, say 350 and take that fuel instead. Your health is in your hands.