The Old Obsession with Immortality
The fascination is ancient. The Epic of Gilgamesh, the oldest known literary work, follows a king's futile search for eternal life. Centuries later, José Saramago's Death with Interruptions imagined a world where no one dies and showed how quickly society's institutions would collapse. Fantasy fiction usually reaches for a magical object, the Philosopher's Stone in Harry Potter being only the latest variation on an old theme.
Outside fiction, the same obsession produced far less poetic consequences. Emperor Qin Shi Huang, who unified China in the third century BC, spent years hunting an elixir of immortality. Convinced by alchemists that substances containing cinnabar, mercury sulfide, would prolong his life, he consumed mercury-rich preparations and died at 49, probably poisoned by his own cure.
Centuries later, the same fantasy resurfaced within the Third Reich: Heinrich Himmler funded Otto Rahn's expeditions through the French Pyrenees in search of the Holy Grail, the Arthurian relic thought to grant eternal life. Rahn found only empty caves in the Cathar fortress of Montségur, but the search shows how far the promise of cheating death travels, even inside regimes that considered themselves rational.
Stranger still is the Royal Fraternity of Master Metaphysicians, a sect founded by physician James Bernard Schafer, a former Ku Klux Klan member blending Rosicrucianism, Christian Science, and faith healing. The group's central belief was that negative thoughts caused every illness, including death, so eliminating them would stop aging.
In 1939, that idea produced an experiment worthy of science fiction: the sect would raise an immortal baby, Jean Gauntt, handed over by a mother who could not afford to raise her. Jean would never hear a word about death or illness and would follow a strict vegetarian "Eternity Diet." The experiment ended after fifteen months, when her mother regained custody, and Jean, unsurprisingly, never became immortal. Schafer's belief was not scientific. Still, it happened upon something science would only confirm decades later: chronic stress and isolation really do make the body sick, a relationship now studied as psychoneuroimmunology.
These stories share an old feature of human nature: faced with death, we prefer extraordinary solutions to obvious ones. Elixirs, relics, mystical philosophies, and miracle diets have all promised what no one has ever actually delivered.
Science supplies a far less spectacular but far more convincing answer — a well-documented set of habits, including at least 150 minutes of moderate activity weekly, a balanced diet, not smoking, and strong social ties. The last point is often underrated. Yet the Harvard Study of Adult Development, underway since 1938, identifies relationship quality as one of the strongest predictors of longevity. There's nothing mystical about it. Poor relationships and chronic stress activate real inflammatory pathways — the evidence-based version of Schafer's crude guess.
Even so, anyone can name someone who smoked, drank daily, and still made it to 90. Exceptions like these raise an inevitable question: how much of a long life comes from choice, and how much from genes?
The Blue Zones
Blue Zones, global sites of longevity, have been featured in the media since the mid-2000s, but Netflix's 2023 miniseries Live to 100: Secrets of the Blue Zones brought the concept to a wider audience. In it, writer Dan Buettner visits five regions with unusually high concentrations of centenarians, looking for the habits behind their longevity: diets rich in minimally processed foods, activity woven into daily routines, strong family and community ties, a sense of purpose, and an active social life.
Buettner's interest traces back to a 1996 Danish twin study estimating genetics at only 20-25% of the variation in longevity, leaving the rest, in theory, to the environment. That small genetic slice motivated the entire Blue Zones hypothesis, though it would later be challenged in ways that change how much weight genetics deserves.
In 2004, with National Geographic and the National Institute on Aging, Buettner identified five demographically validated regions with unusually high centenarian rates: Loma Linda, Nicoya, Sardinia, Ikaria, and Okinawa — Singapore was added later.
Multidisciplinary teams then looked for shared characteristics, producing the Power 9: habits, Buettner argues, these populations share. Naturally, no one claims these habits fully explain the observed longevity. Rather, the idea acknowledges genetics while arguing that environmental and behavioral factors can improve the odds of aging well.
Those nine pillars include moving naturally through daily life rather than relying on gyms, having a sense of purpose (ikigai in Okinawa, plan de vida in Nicoya), reducing stress through prayer, naps, or friends, stopping meals at about 80% fullness, favoring plant-based foods over meat, drinking alcohol in moderation (except in Loma Linda), belonging to a community, keeping family close, and cultivating a healthy social circle.
None of this looks especially controversial. Plant-based diets, physical activity, strong relationships, and lower stress already rank among the factors most consistently associated with healthy aging. Buettner’s contribution is not the habits themselves but the claim that environments can be engineered to make these choices nearly automatic. Buettner's team coined the term "Life Radius" for the roughly 8-kilometer area around home where people spend about 90% of their time. The reasoning is simple: reshaping that environment is more effective than relying on willpower alone.
Interventions ranged from keeping fruit visible to redesigning workplaces with standing desks and safer walking routes. First tested in 2008 in Albert Lea, Minnesota, the model built walking trails, expanded plant-based menus, and had schools drop candy as a reward. Buettner's team projected a 2.9-year gain in life expectancy, though without clinical trials the results cannot be attributed to the intervention alone. The project later expanded to other cities, with improvements reported by the program's organizers.
None of that answers whether independent evidence ties these principles to actual longevity. One review of the “exposome,” the sum of lifetime environmental exposures, found that healthy aging emerges from the cumulative interaction of diet, activity, pollution, and social ties, shared across Blue Zones and other long-lived populations like Italy's Cilento, with the gut microbiome a possible, though unclear, mediator.
A second review pooled 16 studies linking Blue Zone diets to telomere length, a biomarker of biological aging, and found a consistent pattern. Plant-heavy diets, high legume intake, and little ultra-processed food were associated with lower rates of cardiovascular disease, diabetes, and some cancers. But the authors stress that association is not causation. People eating this way also exercise more and smoke less, and most of the evidence is self-reported. Okinawa offers a cautionary example. Younger generations have abandoned the traditional diet for ultra-processed foods, and obesity has risen accordingly, without proving diet alone explains the longevity of earlier generations.
Cracks in the Story
The Blue Zone concept remains far from settled. In a Science commentary, Ross Brownson of Washington University in St. Louis notes that nearly all nine pillars restate standard public health guidance, except that moderate wine's cardioprotective reputation has lost support, and low alcohol intake may raise certain risks, especially for women. He also notes the conspicuous absence of smoking; Buettner has said he would likely include it today.
A sharper critique comes from Saul Newman of University College London. In a 2019 preprint, later expanded, Newman argues that the extraordinary number of centenarians largely reflects failures, and sometimes fraud, in civil recordkeeping rather than biology. Supercentenarian numbers collapsed wherever regions introduced reliable birth certificates, and part of that distortion has a simple explanation.
Keeping a deceased relative "alive" on paper keeps the pension coming. He also found suspicious clustering of birth dates consistent with clerical error and proposed that some centenarians may never have existed or may have died years before anyone reported them. Still unpublished, the work earned Newman the first Ig Nobel Prize in Demography in 2024, pushing the critique well outside academic circles. Buettner rejects the conclusions, arguing that Newman examined regions far broader than the actual Blue Zones and never conducted fieldwork there.
The debate now questions whether the Blue Zones are even a real demographic phenomenon. Aside from the alcohol recommendation, most pillars remain consistent with current evidence; whether they explain the longevity attributed to these places is still open. That is precisely the premise of a recent paper.
How Much of Lifespan Is Inherited?
In "Heritability of Intrinsic Human Life Span Is About 50% When Confounding Factors Are Addressed", the authors argue environment still shapes lifespan, just in a different proportion than assumed. Earlier estimates put longevity's heritability at around 20% to 25%, the same range that sent Buettner looking in the Blue Zones; large genealogical databases later pushed that even lower, to 6% to 16%.
Many of those estimates came from cohorts born in the 18th and 19th centuries, when deaths from accidents, violence, and infection were far higher than today's, obscuring the genetically driven causes. Since these extrinsic causes are now roughly ten times lower, and twin studies rarely record detailed causes of death, older estimates likely understated genetics' real contribution.
The researchers built mathematical models calibrated against Danish and Swedish twin registries and American centenarian siblings. Once corrected, estimated heritability roughly doubled, to about 55%. Even under more homogeneous conditions, roughly half of lifespan variation remains unexplained by genetics, likely reflecting lifestyle, socioeconomic conditions, and healthcare access, and epigenetics. Heritability, it is worth remembering, is not a fixed property of a trait; it depends on the population, environment, and historical moment studied.
Does this mean a sedentary lifestyle and poor diet no longer matter, or that the Blue Zones model is no longer worth taking seriously? Not at all. Environmental factors may carry less weight than earlier estimates suggested, but they still shape a meaningful share of how long, and how well, people live. What the study challenges is not the value of the Power 9; walking, eating well, and good relationships remain good bets for anyone, but the assumption that environment alone explains the extraordinary longevity attributed to places like Okinawa or Ikaria.
