Your Personality And Alzheimer's: What the New Science Tells Us

Here is something most people never think about: the way you handle stress — and how good you are at keeping promises to yourself — may actually affect your chances of getting Alzheimer's disease. A new research review published in Frontiers in Neurology looked at decades of studies on personality and brain health. The findings are eye-opening. And the good news? They point to things you can actually change.

What The Research Found on Personality and Alzheimer's

Scientists have long studied five basic personality traits that describe how people tend to think and act. You may have heard of them — they're sometimes called the "Big Five":

• Neuroticism: How often you feel worried, anxious, or upset.

• Conscientiousness: How good you are at sticking to healthy habits and following through.

• Openness: How much you enjoy new ideas and learning new things.

• Extraversion: How social and outgoing you are.

• Agreeableness: How cooperative and easy-going you tend to be.

The researchers looked at 76 studies published over more than ten years. Two of these five traits stood out far above the rest when it came to brain health and Alzheimer's risk.

The Two Traits That Matter Most

Worry Less, Risk Less. People who tend to worry a lot, feel anxious often, or generally see the negative side of things scored high on neuroticism. In one large study that followed people for 22 years, those with high neuroticism had a 30% higher risk of developing Alzheimer's disease. That is not a small number.

Stay Consistent, Stay Protected. On the other side, people who were good at keeping promises to themselves — staying consistent with exercise, eating well, getting enough sleep, not smoking — scored high on conscientiousness. People who scored low on this trait had a 74% higher risk of Alzheimer's compared to those who scored high. Being consistent with healthy habits is one of the most powerful things you can do for your brain.

Stay Curious. Being curious and open to new things also helped. People with higher openness had a 14% lower risk of Alzheimer's. Learning new things, trying new activities, and staying mentally engaged all protect the brain.

The Really Good News

Here is what makes this research truly exciting: these traits are not fixed. The researchers noted clearly that personality traits can change through deliberate effort — and those changes can last. You are not stuck with the habits of mind you have had for years. Your brain is not locked in.

The study on personality and Alzheimer's also found that personality affects the brain directly. It shapes the everyday choices we make — whether we exercise, eat well, stay socially connected, and keep our stress under control. In other words, your personality influences your habits, and your habits influence your brain health.

A Note For BrainSavers Instructors

This research is a gift for your classroom. You are already helping participants build the habits of conscientiousness — showing up, practicing, following through. That is not small. According to this study, it may be one of the most protective things they do all week.

Consider sharing the two key numbers with your class: a 30% higher risk associated with chronic worry and a 74% higher risk associated with low follow-through on healthy habits. These are real, meaningful numbers that make the case for why your class matters.

You might also open a brief conversation about worry and stress. Not to alarm anyone — but to normalize the idea that managing how we respond to stress is a health behavior, just like exercise. For participants who identify as worriers, remind them that awareness is the first step, and that the very act of being in your class is them taking action.

For BrainSavers Participants

If you are someone who worries a lot or tends to see the glass as half empty, please hear this: you are not alone, and you are not doomed. What matters is what you do next. Showing up to your BrainSavers class is exactly the kind of consistent, health-protecting behavior this research says can make a real difference.

And if you are already someone who follows through on healthy habits — good for you. Keep going. This research says your consistency is paying off in ways you may never fully see, but your brain certainly feels.

Three Things You Can Do This Week

✔  Notice your worry patterns. When you catch yourself spiraling into anxiety or negative thinking, pause and take three slow breaths. Small moments of calm add up.

✔  Keep one promise to yourself. Choose one healthy habit this week — a walk, a good night's sleep, a vegetable at dinner — and follow through. Conscientiousness is built one kept promise at a time.

✔  Try something new. Read about an unfamiliar topic. Take a different route on your walk. Learn one new word. Staying curious is a form of brain protection.

Your personality is not your destiny. But it is a starting point — and now you know exactly where to start.