I didn't know I was lacking in vitamin D until I collapsed at work

Summary
Doctors are finding vitamin D deficiency is increasingly widespread in the UK, especially in young people. But the symptoms are difficult to spot and can be missed.
Description from BBC News.
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I didn't know I was lacking in vitamin D until I collapsed at work
Doctors are finding vitamin D deficiency is increasingly widespread in the UK, especially in young people. But the symptoms are difficult to spot and can be missed.