Invest in Social Connection
Regular in-person time with people who matter. Mortality risk on par with smoking when missing.
What it does
Social isolation is one of the largest non-obvious mortality risks in the literature — its effect size sits alongside smoking and severe obesity. The protocol is regular, sustained, in-person contact; frequency matters more than intensity. A weekly walk with a friend beats an annual reunion.
Social contact appears to modulate stress reactivity, inflammatory signaling, and behavioral self-regulation. Isolation produces sustained stress-pathway activation and degrades health behaviors over time.
What the evidence shows
Overall evidence strength: High certainty
Who it's for, who should skip
Anyone whose in-person contact has thinned. Multiple interactions per week across relationship types; passive social-media consumption is not the connection the research measures.
Access & cost
Self-directed — no purchase required.
Last reviewed 27 August 2026.