Nearly Half of Dementia Cases Could Be Prevented

After watching his father die from dementia at just 59, Professor Henry Brodaty spent his life searching for answers. Now, at 78 and recently named Senior Australian of the Year, he's sharing news that could change millions of lives: nearly half of all dementia cases can be prevented.

More than 420,000 Australians currently live with dementia, making it the country's leading cause of death in 2023. But research published in the Lancet Commission reveals that 45% of these cases are avoidable through lifestyle changes anyone can make.

Brodaty, who leads the Centre for Healthy Brain Ageing at UNSW Sydney, knows prevention starts with getting your heart pumping. He recommends both aerobic exercise and strength training, pushing or pulling weights a couple days a week. A casual stroll with friends won't cut it—you need to get sweaty and out of breath.

Your brain also needs a workout. Education and lifelong learning build what Brodaty calls "cognitive reserve," which acts like a buffer against brain damage. Think of it as building resilience—the more you learn, whether through formal education, new languages, or volunteering, the better your brain can withstand aging.

Food matters more than many realize. Brodaty points to the Mediterranean diet: plenty of vegetables, legumes, extra virgin olive oil, and nuts like almonds and walnuts. Monitoring your cholesterol and limiting saturated fats helps protect your brain just like it protects your heart.

Finally, protect your head physically. Brodaty wishes people worried as much about what's under their hair as the hair itself. Wearing helmets during cycling or contact sports isn't just about preventing immediate injury—it's about protecting your future cognitive health.

The Ripple Effect

Brodaty and his team tested these principles with 8,000 people aged 55 to 77 through their Maintain Your Brain study. Participants who received online coaching in physical activity, nutrition, brain training, and mental health improved their cognition almost three times more than those who only got public information. The program delayed dementia onset by at least a year, proving that small changes create powerful protection.

The best part? These aren't expensive treatments or complicated interventions. They're choices you can start making today—moving your body, challenging your mind, eating better, and protecting your head.

After decades fighting a disease that took his father too soon, Brodaty's message is clear: we have more control over our brain health than we ever knew.