Around half the world’s population is deficient in vitamin D.
Tiredness and weak muscles can be a sign of vitamin D deficiency, research finds.
As a result, people with low levels of vitamin D are at double the risk of mobility issues with age, scientists have found.
Other signs of vitamin D deficiency include poor sleep, symptoms of depression and headaches.
The vitamin is thought to play a role in regulating serotonin, a neurotransmitter important for mood.
Around half the world’s population is deficient in vitamin D.
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