Vitamin D Deficiency Linked to Greater Risk of Early Death

By John Anderer

Here’s a serious motivator for soaking up some extra sunlight — or at least take some extra supplements. New research is revealing compelling evidence that a vitamin D deficiency can lead to premature death. Study authors at the University of South Australia say their findings highlight the importance of following healthy vitamin D level guidelines.

Prior estimates place U.S. vitamin D deficiency levels at somewhere around 40 percent of the adult population. This latest study reports the more severe the vitamin D deficiency, the greater the risk of early death.

Vitamin D is an essential nutrient that helps keep bones and muscles strong and healthy. While prior studies have noted a possible connection between vitamin D levels and mortality outcomes, first study author and UniSA PhD candidate Josh Sutherland explains it’s been tough to establish causal effects.

“While severe vitamin D deficiency is rarer in Australia than elsewhere in the world, it can still affect those who have health vulnerabilities, the elderly, and those who do not acquire enough vitamin D from healthy sun exposure and dietary sources,” Sutherland says in a university release. “Our study provides strong evidence for the connection between low levels of vitamin D and mortality, and this is the first study of its kind to also include respiratory disease related mortality as an outcome.”

“We used a new genetic method to explore and affirm the non-linear relationships that we’ve seen in observational settings, and through this we’ve been able give strong evidence for the connection between low vitamin D status and premature death,” Sutherland continues. “Vitamin D deficiency has been connected with mortality, but as clinical trials have often failed to recruit people with low vitamin D levels – or have been prohibited from including vitamin deficient participants – it’s been challenging to establish causal relationships.”

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People with severe vitamin D deficiencies see bigger benefits

The research team used Mendelian randomization to evaluate 307,601 patient records provided by the UK Biobank, a large-scale biomedical database and research resource featuring anonymized genetic, lifestyle, and health information from half a million U.K. participants. The Biobank’s database includes blood samples, heart and brain scans, and genetic data.

Researchers considered low levels of vitamin D as having less than 25 nmol/L, and the average concentration was 45.2 nmol/L. Over a 14-year follow up period, the team discovered a pattern: risk of death significantly decreased with increased vitamin D concentrations, with the strongest effects coming among those with severe deficiencies.

Professor Elina Hyppönen, senior investigator and Director of UniSA’s Australian Centre for Precision Health, says that more research is necessary to help form new, effective public health strategies for promoting vitamin D and reducing the risk of premature death associated with low levels of vitamin D.

“The take-home message here is simple – the key is in the prevention. It is not good enough to think about vitamin D deficiency when already facing life-challenging situations, when early action could make all the difference,” Prof. Hyppönen explains. “It is very important to continue public health efforts to ensure the vulnerable and elderly maintain sufficient vitamin D levels throughout the year.”

The study is published in the journal Annals of Internal Medicine.

Image: Pixabay

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