It's difficult to be specific, the concept of "health" is broad, but you could try a search, as I think this has been covered many times.
I doubt any specific studies have looked at pressurisation cycles, but you could have a peep at the journals via google scholar, or a medical database such as medline. Medical opinion alone, is probably will not give you the credibility on which to base your career choices.
From memory, I seem to remember pilots on the whole live longer than Joe Average, & tend to suffer more malignant melanoma's, but an insurance actuary would probably give more detail about mortality and morbidity.
Cheers ginge
