One in Four People Carry the Same Alzheimer's Gene as Chris Hemsworth
Finn's Take· TL;DR- One in four people carry APOE4 gene variant, but it doesn't guarantee Alzheimer's—42% with Alzheimer's lack the gene entirely.
- APOE4 disrupts myelin formation in the brain; Chris Hemsworth carries two copies, putting him in rare 2-3% of population.
- Lifestyle changes—exercise, meditation, sauna, sleep, blood pressure management—can meaningfully reduce Alzheimer's risk regardless of genetic predisposition.
The Hidden Risk Factor in Your DNA
When Chris Hemsworth discovered he carries two copies of the APOE4 gene variant during filming of National Geographic's "Limitless," the Thor actor learned he was 8 to 10 times more likely to develop Alzheimer's disease . But here's what might surprise you: about one in four people have one copy of their APOE gene "spelled" as this e4 variant , making this genetic risk factor far more common than most realize.
The APOE4 gene doesn't guarantee you'll develop Alzheimer's disease. Most people with genetic variants of APOE4 will never develop Alzheimer's disease , and about 42% of people with Alzheimer's disease do not have the APOE4 variant . This complex relationship between genes and disease risk means that while genetics matter, they're just one piece of a larger puzzle.
What Science Reveals About APOE4
The APOE gene was first linked to late-onset Alzheimer's in 1993 , but only recently have researchers begun understanding how it affects the brain. Recent studies show APOE4 affects myelin, a fatty substance that insulates nerve cells. In people with APOE4, cholesterol accumulates in the cells that make myelin rather than in the myelin itself , potentially disrupting brain function.
While Hemsworth belongs to only 2% to 3% of the population with two copies of APOE4 , the broader implications affect millions. Over 70 genes are linked to Alzheimer's risk , and a group of genes and a combination of lifestyle factors typically influence the development of Alzheimer's – not one single gene .
Practical Steps That Actually Work
Hemsworth's response to his genetic discovery offers a roadmap for anyone concerned about brain health. Upon discovering his genetic risk, Hemsworth focuses on mental relaxation techniques, longevity-centered exercise, sleeping well, and spending time with family . He's shifted from intense muscle-building workouts to endurance exercise and does a lot of meditation and breathwork .
Research supports these lifestyle interventions. Sauna use reduces the risk of Alzheimer's by 65%, with four 20-minute sessions per week at 180°F or hotter working best . The CDC recommends preventing high blood pressure, managing blood sugar levels, being physically active, quitting smoking, avoiding excessive alcohol, preventing hearing loss, and getting enough sleep .
The Power of Knowledge and Action
Hemsworth's openness about his genetic status has sparked important conversations about testing and prevention. The NHS doesn't routinely offer tests for APOE genes given the uncertainty over whether someone with APOE4 will develop Alzheimer's , but some people find that learning about their risk encourages them to take steps to protect their brain health, while others may feel overwhelmed by the information .
Perhaps most encouraging is the emerging evidence that lifestyle changes can make a real difference. Longevity expert Peter Attia noted that with an "aggressive" lifestyle adjustment, Hemsworth can reduce his risk and become just as susceptible as everyone . The actor himself remains optimistic: "I feel thankful that I have in my arsenal the sort of tools to best prepare myself" .
Whether you carry the APOE4 variant or not, the science is clear: what's good for your heart is good for your brain, and it's never too early or too late to start protecting your cognitive future.