Vitamin D is well known for keeping bones strong, but new research suggests it also plays a role in brain health. A recent study from Rutgers University explored how this vitamin affects memory and reaction time in older adults, particularly women between the ages of 50 and 70.
Most people get vitamin D from sunlight, but it’s also available in supplements for those who don’t spend much time outdoors. While its benefits for bone health are well established, scientists are increasingly interested in how vitamin D might support cognitive function, especially in aging populations.
The Study
Researchers focused on women who were overweight or obese to see how different doses of vitamin D affected their thinking skills. The participants were split into three groups, each taking a different daily dose of vitamin D for one year:
- 600 IU (the recommended daily amount)
- 2,000 IU
- 4,000 IU
All participants were also encouraged to lose weight, as previous studies have linked weight loss to improved brain function.
The Findings
The results showed that women who took 2,000 IU of vitamin D daily had better memory and an improved ability to learn new things. However, there was a surprising downside: their reaction time slowed slightly.
For women taking 4,000 IU daily, the delay in reaction time was even more noticeable. This could be concerning, as slower reflexes increase the risk of falls and injuries, which are major health risks for older adults.
Past studies have also suggested that taking more than 2,000 IU of vitamin D per day might raise the likelihood of falling, making it important to find the right balance between brain benefits and physical safety.
What This Means for Brain Health
This study highlights the need for more research, particularly to determine whether slower reaction times actually lead to more falls. It also raises questions about whether men and women might need different vitamin D levels to support both cognitive function and physical stability.
Beyond vitamin D, there are other proven ways to protect brain health as we age. A Mediterranean-style diet, rich in vegetables, healthy fats, and lean proteins, has been linked to better memory and a lower risk of dementia. Vitamin B, high-fiber foods, and antioxidants also play important roles in keeping the brain sharp.
The Rutgers study, led by Sue Shapses and published in The Journals of Gerontology: Series A, offers valuable insight into how vitamin D supports cognitive function. However, it also serves as a reminder that more isn’t always better—finding the right amount is key to reaping the benefits while avoiding unwanted side effects.
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