Summer sunlight alone may not be enough to resolve vitamin D deficiency

A study from Newcastle University found that vitamin D deficiency may not improve much even in summer for older adults and darker-skinned minority adults in northern England.

Researchers said sunlight alone may be insufficient to restore vitamin D levels in these groups, despite longer days and more UVB exposure.

The finding matters because vitamin D is essential for bone health and calcium metabolism, suggesting some people may need diet or supplements as well as sun exposure.