20 Surprising Signs You Have a Vitamin Deficiency


Unfortunately for people with a vitamin D deficiency, the nutrient plays a role in mental health as well as physical health. If you have a vitamin D deficiency, “something you may notice is a change in your overall mood—feeling down and tired, or even experiencing signs of depression,” notes nutritionist Robert Thomas, co-founder of men’s health website Sextopedia.

The link between your mood and your vitamin D levels exists thanks to serotonin, the so-called happiness hormone. As one 2015 study published in The FASEB Journal notes, vitamin D helps maintain adequate serotonin levels in the brain.


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