You have probably heard that exercise is good for your brain. You have also likely seen headlines about how a healthy diet can protect cognitive function. But new research suggests the real secret is not choosing between the two. It is doing both at the same time.
Dementia currently affects over 55 million people worldwide, and there are still no curative treatments. That means prevention is everything. A 2026 meta-analysis published in April examined 14 randomized controlled trials involving over 4,000 adults aged 65 and older, all of which combined exercise with either dietary guidance or nutritional supplementation. The results showed a statistically significant improvement in cognitive function compared with groups that received no intervention, something that studies examining exercise or diet alone had struggled to consistently demonstrate.
Why does the combination work better? The science comes down to a protein called BDNF, or brain-derived neurotrophic factor, which is critical for memory and long-term neuron health. Exercise boosts BDNF production and increases blood flow to the brain. Nutritional factors such as omega-3 fatty acids and Mediterranean-style diets amplify and extend those effects. Each intervention makes the other more powerful.
There is also the muscle-brain axis, as researchers call it. When you exercise, your muscles release proteins called myokines that can cross the blood-brain barrier and directly stimulate BDNF production in the hippocampus, the brain region most central to memory. The right diet helps sustain and support that process.
The broader message here is important. There is no single silver bullet for brain health. But when accessible, everyday tools like movement and nutrition are combined consistently over time, their effects add up in meaningful ways.
Citations:
Mindbodygreen. New Research Reveals The Best Way To Protect Your Brain As You Age. April 24, 2026. https://www.mindbodygreen.com/articles/both-exercise-and-good-diet-are-key-for-brain-health-prevent-cognitive-decline
Racette SB et al. Lifestyle strategies and mechanistic implications for slowing neurodegeneration. npj Metabolic Health and Disease. 2026. DOI: 10.1038/s44324-026-00101-9