[mixmastamyk]

Yes, we need several minutes of strong (near noon-time) sun across a significant portion of the body. More if you don't drink fortified milk. Winter and old age increase the need.

These days it is common for people to avoid the sun and use excessive sunscreen if they do; geeks are not known for their tans. But a few minutes sunbathing is definitely beneficial.

The govt is a tad behind on this, but it has recently upped the recommendations.