Lifestyle changes could cut Alzheimer's risk by 50%, neurologist says

A neurologist from Valencia's Hospital Universitario Casa de Salud has made a straightforward claim: the choices you make from childhood onward—what you eat, how much you move, whether you read, whom you talk to—could cut your risk of Alzheimer's and other dementias roughly in half. Dr. José Miguel Laímez, speaking at a 2026 neuroscience journalism seminar organized by Lundbeck Iberia, went further: stroke risk could drop by an even larger margin if people committed to sustained lifestyle changes across their entire lives.

The stakes are real. Fifty-seven million people worldwide live with dementia today, making it the seventh leading cause of death and one of the primary drivers of disability and dependence in aging populations. Strokes rank third globally as a cause of death and disability, with an estimated 93.8 million cases occurring annually. These are not rare conditions. They are reshaping how societies care for their elderly and how families plan for the future.

Laímez's argument rests on a concept called cognitive reserve—the brain's ability to withstand injury, disease, and aging because it has built a richer, more densely connected network of neurons. Some of this capacity is inherited. But much of it can be constructed, deliberately, over time. Education matters. Intellectual work matters. Physical activity matters. So do language learning, continuous engagement with new skills, and the quality of your social connections. The brain that has been challenged and stimulated throughout life is more resilient when disease arrives.

The practical toolkit he outlined is neither exotic nor expensive. A Mediterranean diet—olive oil, fish, vegetables, legumes, whole grains, moderate wine—provides the omega-3 fatty acids, folate, and magnesium the brain needs. The brain consumes about one-fifth of the body's total energy, making nutrition a foundational concern from pregnancy onward. Sleep quality matters. Avoiding tobacco and excessive alcohol matters. Controlling blood pressure and other vascular risk factors matters. And screen time, particularly for young people, warrants attention; the evidence suggests excessive device use affects brain development and function across all ages.

But if one intervention stands out in the research, it is exercise. Clinical trials show that a year of aerobic activity increases the volume of the hippocampus, the brain region critical to memory. Long-term studies confirm that people who move more experience less cognitive and functional decline, even those carrying the biological markers of Alzheimer's disease. Exercise appears to reduce the accumulation of tau, the protein most closely linked to the clinical symptoms of dementia. The effect is measurable and significant.

Laímez's recommendation is specific: frequent aerobic exercise combined with strength training at least once weekly. For older adults, balance exercises should be added to prevent falls. And the target is ten thousand steps per day—a number that has become almost shorthand for "enough movement." But his larger point is simpler: more activity yields more benefit. There is no threshold beyond which additional movement stops helping.

What makes this message compelling is not that it is new. Neurologists have been saying versions of this for years. What matters is the scale of the potential payoff—a fifty percent reduction in dementia risk—and the fact that it does not require medication, surgery, or genetic luck. It requires consistency, starting early, and continuing through old age. The brain, like any other organ, responds to how it is used. The question each person faces is whether they will use that knowledge to act.