We could call these people researchers, in honor of their tenacity in scrutinizing and re-scrutinizing their work and the work of others. And when their work impacts the health of the many, maybe we could use mass communications technology to share it.
Pie in the sky, I know.
But we know health and longevity are controlled by a dizzying number of factors that interact, so your suspicion, right or wrong, isn't justified by your observation. For example, far fewer people smoke today than did 30 years ago; medical treatments are more advanced than they were 30 years ago. And finally, phthalates were in widespread use 30 years ago too. Phthalates may have been harming us all along but those other improvements still result in an overall improvement in health and longevity.
This argument doesn't make sense to me without something more specific. Just because such high level concepts like "health" and length of life continue to increase, that doesn't invalidate any particular malady.
If we talk about US I'm unsure about that. Specially the first part of that statement, it seems that at least one of each three Americans are obese.
The best part when _again_ some people studying _put very important thing for the public interest here_ ... is done by volunteers spending their own money.