Did you have a second cup of coffee this morning? Your brain may thank you.

April 1, 2026

Swedish Neuroscience Team

[3 min read]

In this article:

Do you have a second or even third cup of coffee in the morning? In addition to helping you wake up, it just might be protecting your brain.
A recent study showed that caffeine might may neuroprotective factors that can help stave off dementia.
But you can't just double up your morning cuppa; other lifestyle choices play a significant role in protecting brain health over the long-term. Learn more from a Swedish expert.

Many of us start the day with a cup of coffee. New research suggests that this daily habit may do more than boost energy. It may also help support brain health.

A large study published in JAMA, the Journal of the American Medical Association, in February, followed more than 131,000 participants for up to 43 years, making it one of the largest and longest studies of its kind. Researchers found that those who drank 2-3 cups of caffeinated coffee daily had an 18% lower risk of developing dementia compared to those who drank little or none. Decaffeinated coffee did not show the same benefit, suggesting that caffeine may be the key ingredient.

Nancy Isenberg, M.D., MPH, medical director of the-Center for Healthy Aging-at Providence Swedish, says the findings are promising but not a prescription.

“This study in JAMA (Journal of the American Medical Association) suggests moderate caffeinated coffee intake may be linked to lower dementia risk, but it’s important to remember that brain health is built on a broader foundation—physical activity, healthy diet, restorative sleep, cognitive engagement, and control of cardiovascular risk factors.”

The greatest benefit was seen with moderate intake. Drinking more than 2-3 cups did not provide additional protection, and improvements in cognitive test scores were modest.

“For people who already enjoy coffee, this is reassuring. Moderate coffee consumption appears safe for most healthy adults and may offer some brain health benefits,” Dr. Isenberg says.

How does coffee help the brain?

Caffeine appears to work in several ways. It blocks certain receptors involved in neuroinflammation and the build-up of amyloids and tau proteins linked to Alzheimer’s disease. It may also improve insulin sensitivity and support blood flow to the brain. Interestingly, the protective effect was seen regardless of genetic risk factors, including APOE4 status. APOE4 is a susceptibility gene associated with an increased risk of late onset Alzheimer’s disease.

While coffee may help, other lifestyle habits have even stronger evidence.

“Exercise has one of the most powerful effects we know of, lowering dementia risk by 20-40%,” Dr. Isenberg says.

Research also shows strong benefits from:

Regular physical activity (about 150 minutes per week)
Mediterranean or MIND-style diets
Managing blood pressure, cholesterol and diabetes
Staying socially and cognitively engaged
Prioritizing good sleep

“Coffee should complement, not replace, healthy lifestyle habits,” she adds.

Is 2-3 cups safe?

For most adults, 200-300 mg of caffeine daily (about 2-3 cups) is considered safe. But caffeine is not for everyone. Dr. Isenberg advises caution for people who have anxiety or insomnia, certain heart rhythm conditions or uncontrolled high blood pressure.

“Caffeine affects people differently,” she says. “It if disrupts your sleep or increases anxiety, it may do more harm than good.”

The bottom line: moderate coffee consumption may be associated with a lower risk of dementia, but it is not a magic solution.

“Caffeine may be a small piece of the brain health puzzle,” Dr. Isenberg says. “In dementia prevention, the strongest evidence still points to lifestyle measures that support vascular and metabolic health—regular exercise, a healthy diet, quality sleep, and ongoing social and cognitive engagement.”

Learn more and find a physician or advanced practice clinician (APC)

Swedish’s Center for Healthy Aging offers comprehensive, compassionate care focused on enhancing your quality of life throughout all its stages. Our multidisciplinary team works together to create holistic, evidence-based care plans that include programs and services designed to support brain health as you age.

Whether you require an in-person visit or want to consult a doctor virtually, you have options. Contact Swedish Primary Care to schedule an appointment with a primary care provider. You can also connect virtually with your provider to review your symptoms, provide instruction and follow up as needed. And, with Swedish ExpressCare Virtual, you can receive treatment in minutes for common conditions such as colds, flu, urinary tract infections and more. You can use our provider directory to find a specialist or primary care physician near you.

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