> is like 80% of the work for being healthy

I would suspect you're a man under 60.

I don't think your statement applies to the elderly (e.g. my mum needing D and Calcium for osteoporosis).

And I've seen many active healthy female friends under 60 actually need suppliments (I'm ignoring the stereotypical yoga worried well): plus pregnancy or health issues have an impact too.

But maybe I'm a victim of sampling bias since the men I know seem much less likely to see a doctor.

I don’t want to get into an argument about health on the internet, it’s really a no win situation.

Although feeling bad, going to a doctor, getting labs, taking a calcium supplement is completely legitimate and a very different story from watching a YouTuber say ‘everyone is vitamin D deficient’ then going out a buying a bottle of supplements.