Alzheimer’s disease cases are expected to nearly triple by 2050, reaching more than 130 million people worldwide.
The forecast surge in Alzheimer’s cases means the need for effective prevention strategies has never been more urgent.
Fortunately, up to one-third of Alzheimer’s cases might be prevented by avoiding some key risk factors, according to the Lancet Commission, a scientific collaboration.
In its 2024 report, the commission identified 14 such risk factors:
- Air pollution
- Depression
- Diabetes
- Hearing loss
- High cholesterol levels
- Hypertension
- Low physical activity levels
- Obesity
- Social isolation
- Smoking
- Too little education
- Too much alcohol consumption
- Traumatic brain injury
- Vision loss
Donald Weaver, a senior scientist at the Krembil Research Institute in Toronto — which develops treatments for chronic debilitating conditions — realizes the Lancet Commission’s list is a lot for everyday folks to keep track of.
He wrote in a recent article for The Conversation, a nonprofit news organization devoted to the public good:
“[I]t’s not easy for members of the general public to monitor and manage 14 separate health targets — especially when prevention efforts need to start decades before symptoms appear.”
To address this complexity, Weaver proposes a new acronym.
Introducing ‘SHIELD’
Weaver proposes using the word “SHIELD” as a shorthand that consolidates the most significant dementia risk factors into five memorable pillars:
- Sleep: Maintaining healthy sleep habits is crucial, as insufficient sleep (less than five hours per night) increases dementia risk by causing amyloid-beta protein buildup in the brain. These proteins are a hallmark of Alzheimer’s disease specifically.
- Head injury prevention: Often overlooked, traumatic brain injuries significantly increase Alzheimer’s risk and can occur in various settings beyond professional sports.
- Exercise: Regular physical activity might be the most powerful lifestyle intervention, as it directly impacts multiple risk factors such as obesity, high blood pressure, and depression while supporting brain cell growth.
- Learning: Lifelong education and cognitive engagement build “cognitive reserve”—the brain’s ability to function well despite damage. Those with higher education levels show significantly lower dementia risk.
- Diet: Following brain-healthy eating patterns like the Mediterranean diet, which emphasizes whole foods while limiting processed items, supports overall brain health and reduces inflammation.
Weaver’s SHIELD framework mirrors other public health initiatives, such as the “FAST” mnemonic that is used to help people recognize they are having a stroke.
By simplifying complex science into actionable steps, SHIELD can help people make lifestyle choices that may boost their odds of avoiding cognitive decline. As Weaver writes, “Alzheimer’s disease should not be seen as inevitable.”
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