Once thought of as a disease of old age, Alzheimer’s is increasingly showing up earlier; early-onset Alzheimer’s, diagnosed between 40-64, has more than doubled worldwide since 1990.
Yet it’s still not considered a normal part of aging – age alone isn’t enough to cause it. Lifestyle plays a role too. Among Native Hawaiians, researchers estimate nearly 30% of Alzheimer’s cases are linked to factors within our control. This includes high LDL cholesterol, diabetes, high blood pressure, and obesity.
Choosing a healthy diet, exercising regularly, sleeping well, managing stress, and cutting back on smoking and alcohol are all powerful, evidence-backed ways to lower one’s Alzheimer’s risk.
The Mediterranean Diet has shown strong support for reducing this risk, not because of the specific foods it prescribes, but because of certain nutrients those foods share. Researchers point to three: polyphenols, omega-3 fatty acids, and B-vitamins (folate, B6, B12).
Polyphenols are found in māmaki, lūʻau leaf, purple sweet potato, bok choy, choy sum, and kalamunggay. Omega-3s and B12 come from ʻahi, ʻōpelu, akule, sardines, and salmon. Folate and B6 show up in papaya, mango, lilikoʻi, avocado, bananas, and citrus fruits. Together, these nutrients calm brain inflammation and protect brain cells from damage.
Curcumin in ʻōlena (turmeric) goes a step further, helping prevent the brain plaques that precede Alzheimer’s. This particular benefit, however, is mainly seen with concentrated curcumin supplements rather than everyday turmeric use. Still, ʻōlena in its regular form offers meaningful antioxidant value on its own.
Sleep does more than rest the mind. During deep sleep, brain cells shrink slightly, widening the spaces between them so cerebrospinal fluid can flush out toxic buildup behind Alzheimer’s plaques. Prioritizing 7-9 hours of consistent, quality sleep gives the brain the time it needs to complete this nightly wash cycle.
Exercise reshapes the brain, not just the body. A study found that walking 40 minutes, three times a week, actually grew the hippocampus (the brain’s memory center) by about 2%. You don’t need to run marathons; a brisk, heart-rate-raising walk a few times a week is enough to trigger this effect.
Chronic stress has been linked to a more than doubled risk of Alzheimer’s, largely through elevated cortisol shrinking the hippocampus over time. Interestingly, time in nature offers a fast, measurable antidote: just 20-30 minutes in a green space can significantly lower cortisol levels.
Smoking cessation pays off on a real timeline. Dementia risk declines steadily after quitting and levels off around the seven- year mark, eventually matching that of people who never smoked.
It’s never too late to start that clock; every year of being smoke-free moves you closer to that reset.
Alcohol reduction connects back to the same B-vitamins covered earlier: chronic alcohol use interferes with the body’s ability to absorb thiamine (vitamin B1), and deficiency can damage the hippocampus and frontal lobes directly. Recent research also shows no drinking level is truly “safe” for the brain. Even light, regular drinking nudges risk upward.
The body and brain are connected. Care for one, and you are caring for both.
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