Can dementia be prevented? The 14 risk factors you can actually change

Almost every patient over fifty carries this fear quietly, and most assume the answer is genetics and luck. It is not. The 2024 Lancet Commission on dementia concluded that addressing fourteen modifiable risk factors could prevent or delay more than forty percent of dementia cases worldwide. After two decades of practicing medicine, I can tell you that number should change how you think about the next twenty years, because forty percent is not a rounding error. It is the difference between watching and doing.

The fourteen

Here is the full list, grouped the way I work through it with patients. Every one of these is something you and I can put a plan against.

  • The vascular four: high blood pressure, diabetes, obesity, and high LDL cholesterol. What damages the heart’s blood vessels damages the brain’s, and this group is the most actionable of all. A landmark trial found that treating blood pressure intensively significantly reduced new cases of mild cognitive impairment. Blood pressure may be the single highest-yield number on your chart.
  • Physical inactivity. Movement raises blood flow to the brain, supports the growth of new connections, and lowers inflammation. My six daily habits page covers where to start, and it is lower than you think.
  • Smoking and excessive alcohol. Quitting smoking lowers risk at any age. Heavy drinking raises it.
  • Hearing loss and vision loss. These two surprise people every time. Untreated sensory loss starves the brain of input and pulls people out of conversation and social life. Hearing aids and a current eyeglass prescription are brain medicine, and they are on this list for a reason.
  • Depression and low social contact. Both are treatable, both are common, and both are strongly linked. Isolation is a medical risk factor, not a personality trait.
  • Lower education and, closely related, the lifelong version of it: staying mentally engaged. Learning builds what researchers call cognitive reserve, and it is never too late to add to it.
  • Traumatic brain injury. Helmets, fall prevention, and taking head injuries seriously when they happen. Acute brain trauma is an area I have worked in directly, and the long game starts with the first hit you prevent.
  • Air pollution. Less individually controllable, but real, and worth knowing on high-pollution days here in the Valley.

Sleep deserves an honorable mention. It is not on the Commission’s fourteen, but deep sleep is when the brain clears the waste proteins involved in Alzheimer’s, and treating sleep apnea is associated with lower risk, which is one more reason my insomnia page exists.

They stack, and that is the good news

The effect is additive: the more of these you address, the lower your risk goes. In two long-running studies, people practicing four or five healthy behaviors together, a good diet, regular exercise, mental engagement, little or no alcohol, and no smoking, had roughly sixty percent lower risk of Alzheimer’s dementia than those practicing none or one. And here is the part that matters most to anyone with a family history: the benefit shows up even in people carrying the higher-risk genes. Your genetics load the gun; this list decides a great deal about the trigger.

The reason they stack is a concept called brain scaffolding: the aging brain recruits extra circuitry to compensate for wear, and every factor on this list either builds that scaffold or spends it. I explain the science, and which decade of life each lever matters most in, on my page about preventing brain decline and the “brain cliff”.

The honest part

I will not oversell this. Most of the evidence linking these factors to dementia is observational, and when researchers have tested combined lifestyle programs in randomized trials, the measured cognitive gains have been real but modest. The largest recent trial, U.S. POINTER in 2025, did show that a structured, coached program beat a do-it-yourself version over two years, which tells us something important: the structure is part of the medicine. None of this is a cure, and no one can promise you a protected brain. What I can tell you is that every item on that list of fourteen also protects your heart, your metabolism, your mood, and your independence, so the downside of acting is zero and the upside is your next two decades.

What we do about it here

Read that list again and notice how much of it is measurable: blood pressure, blood sugar, cholesterol, weight, and the labs underneath them. That is a physician’s work, and it is exactly what an evaluation in this office covers, alongside the parts no lab shows, your sleep, your movement, your mood, your hearing and vision, your alcohol, and how connected your life actually is. From there we build one plan against your own list, not a generic checklist, and we measure it over time. If you have watched this disease inside your own family, that fear is a good reason to come in early rather than a reason to avoid the question.

Text us at 480-485-2197 to schedule, or call. Quick response, real scheduling, no phone tree.

To Health and Wellness, Dr. Tallman

References

  • The Lancet, 2024 — Lancet Commission on dementia prevention, intervention, and care.
  • JAMA, 2025 — U.S. POINTER: structured versus self-guided multidomain lifestyle interventions for global cognitive function.
  • Neurology, 2020 — healthy lifestyle and the risk of Alzheimer dementia, two longitudinal studies.
  • Neurology, 2022 — healthy lifestyles and risk of Alzheimer disease and related dementias.
  • JAMA Internal Medicine, 2024 — dementia prevention and treatment review.
  • Stroke, 2021 — American Heart Association primary care agenda for brain health.
  • The Cochrane Database of Systematic Reviews, 2021 — multidomain interventions for prevention of dementia and cognitive decline.
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