One of the most fascinating concepts in human health is the idea of social contagion, meaning that emotions, behaviors, and health outcomes can spread through social networks, much like infectious diseases. Examples in the medical literature abound: if a person becomes obese, their friends have a significantly higher chance of becoming obese — even their friends of friends have increased odds of becoming obese. Similarly, someone who quit smoking is likely to create a ripple effect through their social networks, influencing many more people to quit smoking. Social contagion affects life and death itself — after the death of a spouse, the surviving partner's mortality risk increases, and conversely, strong social networks are protective against early death.

Much of the groundwork of our understanding of the powerful health effects of social networks laid by Nicholas Christakis, MD, PhD, MPH, a physician-turned-social scientist who is the author of multiple best selling books, including Apollo's Arrow: The Profound and Enduring Impact of Coronavirus On the Way We Live (2020) in Blueprint: The Evolutionary Origins of a Good Society (2019).

In this episode, Dr. Christakis shares his remarkable path to medicine and sociology, beginning from witnessing his mother's struggle through serious illness, to his foray into palliative medicine, and finally to his life's work on the social, economic and evolutionary determinants of human welfare. We discuss the mechanisms by which social contagion functions, why modern medicine does a disservice to patients by atomizing their medical problems, how the COVID-19 pandemic illustrates the effects of social networks on public health, the philosophical implications of living an interconnected life, and why human beings are wired to build good societies through our capacity for love, friendship and cooperation.

In this episode, you’ll hear about

3:17 - Dr. Christakis’s path to medicine through witnessing his mother’s serious illness

15:05 - How Dr. Christakis became passionate about studying the effects of social networks

24:43 - How social networks affect an individual’s health

31:28 - The negative effects that COVID-19 restrictions had on patients and their loved ones

38:58 - The central thesis of Dr. Christakis’s 2019 book Blueprint: The Evolutionary Origins of a Good Society

50:38 - Dr. Christakis’s thoughts on how to live a meaningful life

Dr. Nicholas Christakis can be found on Twitter/X at @NAChristakis.

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