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Summary
On episode 462 of 40+ Fitness, Coach Allan sits down with Dr. Rob Barrett and Dr. Lou Francescutti to talk about their book Hardwired, How Our Instincts to Be Healthy Are Making Us Sick. Barrett is a social scientist and Francescutti is an emergency room physician, and together they look at why ancient evolutionary drives are steering modern people toward poor health.
Their core argument is that humans are “running on outdated software”: instincts that once kept us alive during scarcity, like a dopamine reward for finding food, now work against us in a world of constant abundance and choice. That mismatch, they say, is a major driver of the obesity epidemic and a lot of other modern health problems.
They also dig into places most people don’t expect, like preventable error in hospitals, why willpower runs out like fuel in a tank, the power of community on heart health, and how phones and social media hijack the same reward systems as food.
Links
- https://www.drrobertbarrett.com
- https://www.drlu.ca
Key Takeaways
- We’re “running on outdated software.” Instincts built for scarcity (a dopamine hit for finding food, water, or a mate) now backfire when food and stimulation are available around the clock, which the authors say is a root driver of the obesity epidemic.
- Hospitals carry more risk than most people realize. Citing a Johns Hopkins study, Francescutti says preventable hospital error is a leading cause of death, and the authors calculate that visiting a U.S. hospital in a given year was statistically more dangerous than serving during the deadliest year of the Iraq surge.
- Simple self-advocacy in a hospital reduces risk. Ask providers to wash their hands in front of you before they touch you, ask how long they’ve been on shift, and bring someone with you to advocate on your behalf.
- “Tactical indulgences” protect willpower instead of burning through it. Citing the classic cookie-and-radish experiment, Barrett explains willpower is a limited resource, and small planned indulgences let people sustain discipline longer than trying to white-knuckle through restriction.
- The Roseto effect shows community protects the heart. An Italian immigrant town in Pennsylvania had strikingly low heart disease despite hard drinking and poor diets, something researchers eventually traced to strong community bonds; the effect faded within two generations as that social structure eroded.
- Loneliness is measurably dangerous, and volunteering measurably helps. Francescutti notes it’s serious enough that the UK created a Minister of Loneliness, and cites research that people who volunteer report being roughly 40% happier.
- Allostatic load, the cumulative wear and tear of chronic stress, compounds across a lifetime. Francescutti adds that stress during pregnancy can change the fetus’s gene expression (epigenesis), and adverse childhood events are linked to higher adult rates of cancer, diabetes, asthma, and obesity.
- Phones and social media trigger the same reward chemistry as food. Checking your phone releases dopamine and oxytocin, but heavy social media use is also linked to higher depression, constant social comparison, and a 35% rise in adolescent suicide rates.
- Rob and Lou’s strategies to get and stay well: Dr. Lou starts with basics like stable housing, education, and strong family, then adds recognizing how much control we actually have and understanding that we’re running on “outdated software” that needs conscious management. Dr. Rob builds on that with understanding your body and its hardwiring, feeding the brain’s reward system in more positive ways, and prioritizing real, face-to-face social connection.
“Loneliness is worse for your heart health than smoking.”
Dr. Lou Francescutti
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