OBI's CEO and Scientific Director Featured in The Weather Network on Vitamin D and Dementia Risk
19 mai 2026
Ontario Brain Institute (OBI) CEO and Scientific Director Dr. Tom Mikkelsen was recently featured in The Weather Network, offering expert commentary on a new study exploring the link between vitamin D levels in midlife and long-term brain health.
Published April 1, 2026 in Neurology® Open Access, an official journal of the American Academy of Neurology, the study followed nearly 800 adults over 16 years and found that those with higher vitamin D levels in their 30s and 40s had lower levels of tau protein in their brains later in life, a key biomarker linked to Alzheimer's disease and other forms of dementia. Lead author Dr. Martin David Mulligan of the University of Galway noted that midlife is a particularly important window for intervention, where risk factor modification can have the greatest impact on long-term outcomes.
In the feature, Dr. Mikkelsen offered a clear explanation of how tau protein damages the brain: abnormal protein clumps form within neurons, interfering with their function and ultimately causing cell death. The accumulation of enough of these losses results in measurable cognitive decline.
While the findings are promising, the study demonstrates an association rather than direct causation, and further research is needed before firm conclusions can be drawn. Vitamin D levels can be assessed through a routine blood test and improved through sun exposure, dietary changes, or supplements under a doctor's guidance.
OBI supports dementia research through initiatives including the Canadian Dementia Registry and brain health datasets through Brain-CODE, Ontario's neuroinformatics platform that enables researchers to connect and analyze brain health data at scale. This work helps build the evidence base for prevention strategies like those explored in this research, and reflects OBI's commitment to translating science into accessible knowledge for Canadians.
Read the full Weather Network feature: Could sunshine reduce your dementia risk? Here's what a new study says
Image courtesy of The Weather Network