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Vitamin D deficiency: This “subtle” symptom is a major warning sign

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Vitamin D is created from direct sunlight on the skin when outdoors. Vitamin D helps regulate the amount of calcium and phosphate in the body. These nutrients are needed to keep bones, teeth and muscles healthy. People that lack the vitamin may experience achy bones. A more subtle sign is a change in a person’s mood.

According to Holland and Barrett, a common sign is a low mood. As the health body explained: “The so-called happy hormone (serotonin) falls with lack of sun exposure. If you feel low or irritable, it could be a sign.”

The relationship between vitamin D and mood is backed by growing evidence. One study conducted a review of more than 100 leading articles and found a relationship between vitamin D and seasonal depression.

“Seasonal affective disorder is believed to affect up to 10 percent of the population, depending upon geographical location, and is a type of depression related to changes in season,” said Alan Stewart of the University of Georgia College of Education.

He added: “People with SAD have the same symptoms every year, starting in fall and continuing through the winter months.”

Stewart said, based on the team’s investigations, vitamin D was likely to be a contributing factor in seasonal depression.

As he explained: “We believe there are several reasons for this, including that vitamin D levels fluctuate in the body seasonally, in direct relation to seasonally available sunlight.

Vitamin D is also involved in the synthesis of serotonin and dopamine within the brain, both chemicals linked to depression, according to the study researchers.

“Evidence exists that low levels of dopamine and serotonin are linked to depression, therefore it is logical that there may be a relationship between low levels of vitamin D and depressive symptoms,” said Michael Kimlin, a Cancer Council Queensland Professor of Cancer Prevention Research.

Another study revealed a link between a lack of vitamin D and depression in later life.

The study, published in The Journal of Post-Acute and Long-Term Care Medicine (JAMDA), showed for the first time in Ireland that a deficiency in vitamin D was associated with a substantial increased risk of depression (75 per cent) over a four-year follow up period.

The study investigated the links between vitamin D and depression in older Irish adults and then re-examined the participants four years later to see if vitamin D status affected the risk of developing depression.

The authors found that:

Vitamin D deficiency was associated with a 75 per cent increase in the risk of developing depression by four years

This finding remained robust after controlling for a wide range of relevant factors including depressive symptoms, chronic disease burden, physical activity and cardiovascular disease

Furthermore, excluding participants taking anti-depressant medication and vitamin D supplementation from the analyses did not alter the findings

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