Vitamin D: More Than Just the Sunshine Vitamin
Recent results published in the journal Sleep Medicine add to the growing pile of evidence that vitamin D could give your brain a much-needed boost and possibly help prevent dementia. This particular study is the first to specifically examine how vitamin D supplementation relates to cognitive function in people showing two main warning signs of early dementia: mild cognitive impairment (MCI) and sleep disturbances.
Just to recap—MCI involves changes in memory, language, or attention that go beyond what’s expected from normal aging, but without affecting a person’s ability to live independently. Still, it can be worrying (and a little annoying when you can’t remember where you left your car keys)
The Study: How Much Vitamin D Makes a Difference?
Researchers tested the cognitive abilities of 54 adults aged 50 and above, all of whom had either diagnosed or suspected MCI—and signs of sleep problems to boot. Specifically, participants completed the Montreal Cognitive Assessment (MoCA) to measure their cognitive functions, and took two different sleep quality assessments: the Pittsburgh Sleep Quality Index (PSQI) and the Epworth Sleepiness Scale (ESS). Importantly, they were also given vitamin D supplements.
The scientists compared participants’ daily vitamin D intake with their performance on both cognitive and sleep quality tests. The findings? Those taking a daily dosage of over 5,000 IU (International Units) of vitamin D scored about 13% higher on the MoCA cognitive test, compared to folks who weren’t taking any vitamin D supplement. And for the skeptics among us: this result still held up even after accounting for factors like age, gender, body mass index (BMI), the specific type of vitamin D taken, and education level.
People who took lower daily doses of vitamin D also scored a bit higher than those not supplementing every day, but the most significant improvements were seen in the group that received higher supplementation.
Intervening Early: The Window of Opportunity
According to the research team, stepping in early might make all the difference when warning signs of dementia appear.
“It may be a critical time to intervene, at the stage when cognitive declines appear and it’s still possible to preserve brain health,” explained Victoria Pak, sleep specialist at Emory University in Atlanta, Georgia, and co-author of the study.
But before you go full superhero on your supplement drawer, a quick note: in the United States and many other countries, 4,000 IU of vitamin D per day is considered the safe upper limit for adults, according to organizations like the European Food Safety Authority (EFSA). The amount given to study participants was slightly higher than recommended daily max, specifically to test effects, and exceeding this could risk excessive calcium in the blood (a.k.a. hypercalcemia—definitely not as fun as it sounds).
What’s Next? Promising, But Not a Miracle Cure
This observational study, conducted on a small group, doesn’t actually prove that vitamin D supplementation improves cognitive performance. However, among the many studies out there, it brings additional evidence that vitamin D might help prevent dementia. And let’s not forget: vitamin D already boasts a track record for supporting bone health, immune function, and muscle performance.
The authors believe these early findings lay the groundwork for future research in larger, more diverse groups, stating:
“Identifying accessible and modifiable factors, such as vitamin D supplementation, at the earliest stages of cognitive decline could become increasingly important, especially given the continuous rise in cases of Alzheimer’s disease,” said Victoria Pak.
So, lining up those pill bottles or just enjoying a bit more sunshine might not be such a bad idea for your brain after all—but as always, talk to your doctor before starting any new supplement routine.
https://www.futura-sciences.com/en/this-common-vitamin-could-boost-brain-scores-by-13-are-you-getting-enough_38882/