Behavioral Grooves Podcast The Real Secret to Living Longer | Ken Stern
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Mar 16, 2026 Ken Stern, journalist and author on longevity, argues social connection and purpose shape healthy aging more than diet alone. He talks about loneliness’ health toll, cultural models that keep older adults engaged, rethinking retirement, and practical ways to build everyday ties.
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Loneliness Harms Health Like Heavy Smoking
- Loneliness has a physiological impact comparable to heavy smoking and shortens healthy life expectancy.
- Ken Stern cites research equating loneliness to smoking 15 cigarettes a day and links it to higher cortisol, inflammation, and cognitive decline.
Americans Live Longer In Poorer Health Than Peers
- The U.S. underperforms peer countries on both life expectancy and healthy life expectancy.
- Ken Stern notes U.S. life expectancy ~79, about seven years below Japan, and Americans live more years in poor health.
Social Capital Declined Since Television And Accelerated With Phones
- Social connection metrics have declined sharply since 1980 and accelerated with smartphones.
- Stern cites Putnam's timeline: TV adoption then phones led to less time with friends, fewer people with six+ friends, and more people with none.
