I read something many years ago that said the original Italian immigrants used to make their pastas and hang them from balconies in the sun to dry. The government stepped in and stopped this..and within a year or so a lot of them were becoming deficient in vitamin D...
The sun is a vitamin that we, as humans, need and are being deprived of with artificial sun blocks, which in themselves are causing cancer. Some sun each day is needed, and we can get a lot of it from foods.