🧠 A Younger-Looking Brain May Help Protect Thinking Skills from Early Alzheimer’s Changes

A study of older adults found that people whose brains appeared “younger” on MRI showed less cognitive vulnerability to early Alzheimer’s-related changes in the blood and brain. 🏃‍♀️🧩

Published In: Neurology
Date: May 2026
Authors: Sewell, et al.
Link to Study: https://www.neurology.org/doi/10.1212/WNL.0000000000214833

Summary

This study looked at whether “reserve”—the brain’s ability to stay resilient despite Alzheimer’s-related changes—could help protect thinking skills in cognitively healthy older adults. Researchers studied 621 adults ages 65–80 who were physically inactive and had no diagnosed cognitive impairment. They found that people with “younger-looking” brains on MRI were less affected by higher Alzheimer’s-related pathology, especially in memory, processing speed, working memory, and attention/executive function. The study suggests that maintaining overall brain health may help buffer the effects of early Alzheimer’s changes, although long-term studies are needed to confirm this.

Key Takeaways

✅ Brain age mattered. People whose brains appeared younger than their actual age showed weaker links between Alzheimer’s-related biomarkers and poorer thinking skills.

✅ Protection was seen across several thinking abilities. The strongest effects were found for episodic memory, processing speed, working memory, and executive function/attention.

✅ Education alone was not enough to explain resilience. Years of education did not significantly change the relationship between Alzheimer’s pathology and cognition.

✅ Socioeconomic status may play a role. Higher objective socioeconomic status showed some evidence of buffering memory vulnerability, but the result was not strong enough after statistical correction.

✅ Lifestyle may be important. The authors note that brain age may be influenced by modifiable lifestyle factors such as physical activity and exercise, making brain health a possible target for prevention.

Why It Matters for You

This study supports the idea that keeping your brain biologically “younger” may help protect thinking skills, even when early Alzheimer’s-related changes are present. Habits that support brain health—especially regular physical activity, cognitive engagement, social connection, sleep, and heart-healthy nutrition—may help build resilience over time.

Citation

Sewell, K. R., Solis-Urra, P., Huang, H., Karikari, T. K., Grove, G., Kramer, A. F., McAuley, E., Burns, J. M., Hillman, C. H., Vidoni, E. D., Morris, J. K., Marsland, A. L., Kang, C., Sutton, B. P., Wan, L., Kamboh, M. I., Gianaros, P. J., Drake, J. A., Stern, Y., Oberlin, L. E., & Erickson, K. I. (2026). Cognitive and brain reserve as modifiers of early Alzheimer disease–related cognitive vulnerability. Neurology, 106, e214833. https://doi.org/10.1212/WNL.0000000000214833