"We can see that genes associated with low Vitamin D levels involve an increased mortality rate of 30 percent and, more specifically, a 40 percent higher risk of cancer-related deaths," said Shoaib Afzal, medical doctor at Herlev Hospital, Copenhagen University Hospital in Denmark.

"An important factor in our study is that we have established a causal relationship," Afzal added.

When the sun shines on our skin, the skin produces Vitamin D.

Evidence suggests that sunshine has a positive effect on our health, but sunburns must be avoided as they increase the risk of skin cancer.

A diet rich in Vitamin D or the intake of Vitamin D supplements can also cover our need to some extent.

The study involved 96,000 people from large-scale population studies in Denmark. Vitamin D levels were measured using blood samples from the studies, and specific genetic defects were examined.

All participants were followed for mortality from 1976 until 2014.

"Our study shows that low Vitamin D levels do result in higher mortality rates," Borge Nordestgaard from University of Copenhagen said.

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