April 1, 2026

@michaelokun

Can exercise and aggressive risk factor control protect your brain as you age? A new randomized trial provides important data. In a randomized clinical trial participants are assigned by chance to different treatments to in a 'more fair way' test what works. Rong Zhang and colleagues describe in a new paper in JAMA Neurology the effects of exercise and intensive vascular risk reduction on cognitive function in older adults at risk for dementia. Key Points: - Over 24 months, aerobic exercise, intensive blood pressure and cholesterol lowering, or both did not significantly improve overall cognitive scores compared to usual care. - Cognitive scores improved slightly across all groups, suggesting possible practice or participation effects rather than a true treatment benefit. - Intensive vascular treatment successfully lowered blood pressure and cholesterol, however this did not translate into measurable cognitive gains over the study period. My take: This is an important and humbling study. We all want a clear signal that exercise or aggressive risk reduction will sharpen cognition in the short term. However, biology is complex. Brain health may require longer timelines, earlier intervention, or more comprehensive strategies. This does not mean these approaches are not valuable. It means we need to better understand how and when they work. Here are 5 points that resonated w/ me: 1- Exercise remains critical for overall brain and body health, even if short term cognitive gains are not obvious. 2- Lowering blood pressure and cholesterol is essential for preventing stroke and vascular disease and likely still matters for long term brain health. 3- Not seeing a signal at 2 years does not mean there is no benefit over 5 or 10 years. 4- Brain health may require combining exercise w/ diet, cognitive training and social engagement rather than a single approach. 5- Folks should not stop healthy habits based on one study, instead this work should guide smarter and more personalized prevention strategies moving forward. https://cutt.ly/UtAAvAih #michaelokun #fixelinstitute #parkinson