You know if you ate right (no SAD diet) and did the right things, the place to target is something else. Did you check your house for radon gas? Do you live near or downwind (maybe many many miles) from an industrial smokestack of any kind or size? Do you filter water? Does your work have any of those same things mentioned plus maybe some of their own? There is also genetics, and inheritance. You know sounds like you did good things and still had trouble, but blaming the things you did right might not be the answer.