We're learning more about what vitamin D does to our bodies

We're learning more about what vitamin D does to our bodies The sunshine vitamin could affect your immune system and heart health. It has started to get really wintry here in London over the last few days. The mornings are frosty, the wind is biting, and it's already dark by the time I pick my kids up from school. The darkness in particular has got me thinking about vitamin D, a.k.a. the sunshine vitamin. At a checkup a few years ago, a doctor told me I was deficient in vitamin D. But he wouldn't write me a prescription for supplements, simply because, as he put it, in the UK is deficient. Putting the entire population on vitamin D supplements would be too expensive for the country's national health service, he told me.