Doug Whitney, a US mechanic carrying a genetic mutation that typically triggers early-onset Alzheimer’s disease, has reached his late 70s without symptoms. Researchers link his protection to decades of intense heat exposure in ship engine rooms. The case bolsters evidence that heat therapy may safeguard the brain against the condition.
Doug Whitney inherited a rare variant of the Presenilin 2 gene from his Volga German ancestors, which causes protein misfolding in the brain and almost always leads to Alzheimer’s in the late 40s or early 50s. Despite this, the 77-year-old shows no major memory issues. “My family has been devastated by this disease,” Whitney said. “My mom had 13 brothers and sisters, and 10 died before they were 60 years old. It’s been a plague.” He remains the only known carrier to evade the disease long past its expected onset. Whitney spent two decades from age 18 working in steam-propelled navy ship engine rooms, where temperatures hit 50°C (122°F). He often endured hours in the heat, sometimes needing to be hosed down to cool off. This exposure produced unusually high levels of heat shock proteins in his cerebrospinal fluid, which help repair damaged proteins. Geoffrey Canet at the French National Centre for Scientific Research, along with Emmanuel Planel at Laval University, investigated after discussions with Randall Bateman of Washington University in St. Louis, who has studied Whitney for years. They found Whitney’s brain has little abnormal tau protein—misfolded tangles tied to cognitive decline—despite abundant amyloid plaques. Mouse studies by Canet’s team showed heat therapy preserved tau structure and boosted its clearance from the brain. Rebecca Nisbet at The Florey brain research centre in Australia called the heat exposure a possible factor but noted Whitney’s other protective genes. “I think it’s one of those things that isn’t going to hurt and may reduce your dementia risk,” she said of saunas. Finnish studies support this, showing frequent sauna users face 65 percent lower Alzheimer’s risk.
