Low vitamin D levels in the blood are associated with an increased risk of developing bladder cancer, according to a large umbrella review published in Cancer Medicine. A comprehensive analysis of multiple global studies found that individuals with vitamin D deficiency, defined in this research as blood levels less than 30 nmol/L, had a 32% increased risk of the disease compared to those with adequate levels.
Specific findings from the review indicate that this risk varies with disease severity. For instance, the link was notably stronger for muscle-invasive bladder cancer, a more aggressive form where the cancer has grown into the bladder’s muscular wall, with research showing the risk can be 1.7 times higher in individuals with low vitamin D levels.
Age also appears to play a role in this relationship. Specifically, one study showed that for adults in their 40s, maintaining adequate vitamin D levels was linked to a nearly 50% reduction in risk, though this protective trend was not observed in individuals over 50.
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While vitamin D blood levels showed a consistent association with cancer risk, the evidence regarding dietary intake and supplements remains less certain. Clinical trials focusing on supplementation have failed to demonstrate a steady preventive effect, suggesting that the body’s natural metabolism and factors like sun exposure might be more significant than oral intake alone.
The review’s authors noted that further studies are needed to determine if vitamin D could help prevent bladder cancer. “Future research should adopt standardized methods for vitamin D measurement, clarify the role of free versus total vitamin D, and account for population-specific and genetic factors,” they concluded.
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