Your Genes Load The Dice. A 22-Year Study Suggests Volunteering Can Change The Roll.

By Paul E. Bendheim, MD — Founder of BrainSavers; board-certified neurologist and Clinical Professor of Neurology, University of Arizona College of Medicine – Phoenix; author of The Brain Training Revolution: A Proven Workout for Healthy Brain Aging

Han SH, Faul JD. "Prosocial helping behaviors attenuate accelerated cognitive decline driven by APOE ε4." Alzheimer's & Dementia, volume 22, issue 9, e71877, 2026. Open access.

People sometimes tell me that they've had a genetic test and learned they carry the gene that raises their risk of Alzheimer's disease. Then they ask the question underneath it: is there any point in trying? A study published this month gives one of the more encouraging answers I've seen, and the thing it points to isn't a drug or a supplement. It's giving a few hours a week to other people.

The Gene In Question

The gene is called APOE, and it comes in a few common versions. One of them, APOE ε4 (you'll see it written "e4"), is the strongest known genetic risk factor for late-onset Alzheimer's. About one in four people in this study carried at least one copy.

Carrying it isn't a diagnosis. Plenty of carriers never develop dementia. On average, though, their memory and thinking decline faster with age, and that faster slope is what this study set out to change.

What The Researchers Did

Sae Hwang Han at the University of Texas at Austin and Jessica Faul at the University of Michigan used the Health and Retirement Study, a national survey that has followed American adults over 50 for decades. They had 22 years of data, from 1998 to 2020, on 17,972 people who had given a DNA sample, so each person's APOE status was known.

Every two years, participants took a short memory and thinking test by phone. They also answered two simple questions. Had they done any volunteer work in the past year for a religious, educational, health-related, or other charitable organization? And had they spent time helping friends, neighbors, or relatives who didn't live with them, without being paid?

The design is what makes this study worth a close look. The researchers compared each person with themselves over time, asking what happened to their memory after they started volunteering or stopped. That approach filters out a lot of the differences between people, such as education, personality, and upbringing, that usually muddy studies like this one.

What They Found

The gene did its usual damage. Carriers declined faster than non-carriers, and people with two copies declined fastest of all.

Volunteering slowed that decline. When carriers took up volunteering, their memory and thinking scores fell more slowly than you'd expect from their genes. The benefit held for white, Black, and Hispanic participants alike.

Stopping reversed it. When carriers gave up volunteering, their decline sped up again.

A modest amount was enough. The benefit showed up at under 200 hours a year, which works out to roughly four hours a week or less. People who jumped to 200 hours or more didn't show a clear benefit. The authors suggest that too much of a good thing can turn into a strain.

For Hispanic older adults, everyday helping counted too. Informal help to family, friends, and neighbors didn't make a measurable difference in the full sample. Among Hispanic participants, and especially those born before 1950, it slowed decline much as formal volunteering did. The authors connect this to cultures where a lot of helping happens inside the family and the neighborhood rather than through organizations.

To make the numbers concrete, the researchers modeled a 60-year-old with two copies of the gene. If that person starts volunteering and keeps at it, they reach the threshold for cognitive impairment about two years later than if they never volunteer. That's a projection from the study's statistics, not a result observed in any one person, but two years is a meaningful stretch of a life.

What This Study Does Not Say

This is an observational study. Nobody was assigned to volunteer, so it can't prove that volunteering caused the slower decline. The authors took several steps to rule out the obvious objection that people whose memory is slipping simply stop volunteering, and their results held up. But they're still clear that a randomized trial is the stronger test.

The questions were broad. They asked whether someone volunteered and roughly how many hours, not what they did or whether they enjoyed it. The memory test was a short phone screening, not a clinical diagnosis of dementia. And the results come from American adults only.

Why Helping Might Help

The authors point out that APOE ε4 does its harm partly through inflammation, blood vessel health, and the body's stress response, and that helping others seems to push those same systems in a healthier direction. Volunteering also packs several things we already know are good for the brain into one activity: getting out of the house, being with other people, learning new routines, and having a reason to show up.

That last one matters more than it sounds. In my experience, people who feel needed tend to stay engaged, and engagement is one of the ways we build cognitive reserve, the extra capacity that lets a brain keep working well even as age and disease take their toll.

The Really Good News

For most of my career, the message people heard about Alzheimer's genes was fatalistic: you have it or you don't, and there's nothing to be done. This study adds to the evidence that genes load the dice without deciding the roll. What you do with your time still matters, even for people who start with the highest genetic risk.

Socialization is one of the six pillars of BrainSavers, alongside physical exercise, mental exercise, nutrition, sleep and stress management. We've written before about how friendship keeps the brain young and about SuperAgers, whose sharp memories aren't explained by their genes. This study adds something specific: the kind of social connection that involves helping someone else, in amounts most retirees can manage.

A Note For BrainSavers Instructors

This study makes a good conversation starter for the socialization pillar. Ask the class who volunteers now, who used to, and what made them stop. The finding that giving it up was linked to faster decline tends to land. Keep it hopeful: the benefit came from modest amounts, so nobody needs to take on a second job.

For BrainSavers Participants

You don't need to know your genes to act on this. Volunteering and helping others are good for the brain whatever your APOE status, and this study suggests they may matter most for the people who carry the higher-risk gene.

Three Things You Can Do This Week

• Try one shift. Pick an organization you care about, such as your place of worship, a library, a food pantry, or a school, and offer a few hours.

• Count the help you already give. Driving a neighbor to an appointment or helping a relative with errands is helping too. Keep it up.

• Keep it manageable. In this study, a few hours a week was enough. Choose something you'll still enjoy doing a year from now.

You are not simply a passenger on the journey of your own brain aging, even when your genes have a say on the route.

This article is for general educational purposes and is not medical advice. Talk with your own healthcare provider before making changes to your health, exercise, or medication routine.