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It is an unfortunate drawback, but I don't think it's an oversight.

This data comes from cohort studies on nurses and other healthcare workers, so it wouldn't generalize well at all. We can assume eating veggies and smoking cigarettes affect them similarly to other people. They might be more likely to recognize problems and seek treatment, but they're not actually getting more or less nutrition out of kale.

When it comes to sex though, doctors and nurses are likely to have very different risk factors than the population average, in ways that are hard to rigorously study. Even beyond using protection or getting tested, they probably don't have the same protection error rates, partner pools, etc., as the general public.




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