Warning: this entry reveals my shamefully ripe old age.
After buying calcium-rich milk, I talked with a co-worker about bones, calcium and vitamin D.
He was flabbergasted when I told him that one of the sources of vitamin D is sunbathing, and that when I was child, people extolled the healthy virtues of sunbathing.
Apparently, doctors stopped recommending sunbathing once the food available to all became richer, richer also in vitamin D. So it was not necessary to sunbathe anymore for the vitamin and expose oneself to skin cancer risk in the process.
Or…he faked being flabbergasted (more probable).