David Shaywitz, MD, PhD

David Shaywitz, MD, PhD

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Physician/strategist; writes on tech x health, behavior change, and policy.

Beware the Obsession with Optimization in Health Tech
SocialApr 6, 2026

Beware the Obsession with Optimization in Health Tech

So many (including me) have been critical of relentless, and generally misguided, focus on optimization it’s easy too forget how dominant this mindset is. This LI post from @WHOOP is good example (emphasis added). @BStulberg @ZekeEmanuel @EricTopol @zakkohane https://t.co/HvgpVi9Tow

By David Shaywitz, MD, PhD
Lifestyle Beats Medicine; AI Guides Health Behaviors
SocialApr 6, 2026

Lifestyle Beats Medicine; AI Guides Health Behaviors

Hear me now, believe me later: the unreasonable effectiveness of lifestyle in sustaining health (latest @timmermanreport) -> https://t.co/0cibAwyaZi I also describe role for AI here (beyond silly image creation) - providing considered behavior guidance->agency engine. @zakkohane https://t.co/42mZLMj2DD

By David Shaywitz, MD, PhD
AI Should Empower Personal Agency, Not Just Track Data
SocialApr 5, 2026

AI Should Empower Personal Agency, Not Just Track Data

Fitness platforms track everything & hope, w AI, to use these (often ?able) data to enhance performance. But this isn't the same as building deeper capability. The real oppy: AI that gets to know you well enough to become an engine...

By David Shaywitz, MD, PhD
Lifestyle Choices Prove Surprisingly Powerful
SocialApr 5, 2026

Lifestyle Choices Prove Surprisingly Powerful

Just out: new @timmermanreport column: The Unreasonable Effectiveness of Lifestyle. https://t.co/0cibAwyaZi @zakkohane @shottan @BStulberg @hjluks

By David Shaywitz, MD, PhD
Flourishing Health: A Capacious View From Keynote
SocialApr 4, 2026

Flourishing Health: A Capacious View From Keynote

Great summary by Personify Health of my recent keynote talk offering capacious view of flourishing health at Thrive Summit (nb actually lecturer not prof @HarvardDBMI) https://t.co/jihbkhInXH @BStulberg @angeladuckw @shottan @EmilyBreslow @fittinsider https://t.co/WLiU9pBeCT

By David Shaywitz, MD, PhD
New HHS Hire Sparks Insightful Healthcare Policy Discussion
SocialApr 2, 2026

New HHS Hire Sparks Insightful Healthcare Policy Discussion

What a refreshingly...normal ...convo abt healthcare policy in general, & implications of new HHS hire, @1klomp, in particular, on lasted ep of the always excellent @tradeoffspod hosted by @dmgorenstein, & feat @ddiamond, reporter who (obv) Knows His Shit. https://t.co/EbUtUJMOoK

By David Shaywitz, MD, PhD
Science‑Driven Prevention Beats Treatment, Validates Lifestyle Interventions
SocialMar 31, 2026

Science‑Driven Prevention Beats Treatment, Validates Lifestyle Interventions

Moving upstream in health-from treatment to prevention-& following the science & the data, leads to a portfolio of lifestyle interventions, surprising some who equate lifestyle w woo. (via @EvidenceOpen). cc @zakkohane @PeterAttiaMD @willahmed @EmilyBreslow @shottan @hjluks https://t.co/LQNC3tNQdU

By David Shaywitz, MD, PhD
Power Dynamics Expose Uncomfortable, Universally Validated Human Truths
SocialMar 30, 2026

Power Dynamics Expose Uncomfortable, Universally Validated Human Truths

@JeffreyPfeffer Yet another eg of an aspect of human behavior you've been highlighting for years. Your social science research on power reveals uncomfortable truths that most don't like to discuss - yet are constantly validated all the same...

By David Shaywitz, MD, PhD
Balanced Sleep Science Meets Psychology in Future of Everything
SocialMar 29, 2026

Balanced Sleep Science Meets Psychology in Future of Everything

At a time when health gurus feel obliged to offer impossibly precise advice, this ep of @Rbaltman's "Future of Everything," featuring Jamie Zeitzer, focuses on sleep & offers (like the podcast more generally) just the right blend of science and...

By David Shaywitz, MD, PhD
US Health Care Costs Begin to Flatten, Tech Helps
SocialMar 28, 2026

US Health Care Costs Begin to Flatten, Tech Helps

Will generate discussion: new @BrookingsInst report from David Cutler & @LevKlarnet (h/t @peter_orszag) suggesting early evidence that we're starting to bend US HC $ curve https://t.co/KUH3muQRFz @ScottGottliebMD @amitabhchandra2 One potential factor: tech... @DanielSodickson https://t.co/Ux1PT7QsgU

By David Shaywitz, MD, PhD
Power's Pull: Why Leaving the Spotlight Tempts Us
SocialMar 27, 2026

Power's Pull: Why Leaving the Spotlight Tempts Us

The challenge of remaining away from the spotlight - and the corrresponding temptation to reenter the arena - is discussed with characteristic insight and candor by @JeffreyPfeffer in at least one of his books about power - all are essential...

By David Shaywitz, MD, PhD
Eli Lake Unpacks a Riveting The FP Story
SocialMar 27, 2026

Eli Lake Unpacks a Riveting The FP Story

Icing on cake: @EliLake discusses this fascinating @TheFP story with author @FPJaySolomon on special ep of the always excellent @BreakingHistPod https://t.co/GKGr1a3juI

By David Shaywitz, MD, PhD
Companies Blame AI for Layoffs Despite Limited Capability
SocialMar 26, 2026

Companies Blame AI for Layoffs Despite Limited Capability

Interesting and apt @wsj highlighting “AI washing” - attributing corporate layoffs to AI vs usual reasons. In most cases fear of AI >> capabilities of AI (at least right now) to actually do most jobs. ⁦@zakkohane⁩ https://t.co/6Ur4GCG7RX ⁦@JamesBessen⁩ https://t.co/7vXBnQOUt9

By David Shaywitz, MD, PhD
Exercise Delivers Broad, Profound Health Benefits, Study Shows
SocialMar 25, 2026

Exercise Delivers Broad, Profound Health Benefits, Study Shows

Conclusion from the outstanding, just-published (https://t.co/7jt7us8EmG) @Cell_Metabolism article about the many health benefits of exercise (h/t @DanielJDrucker)... @zakkohane @bobkocher @willahmed @Schwarzenegger @onepeloton https://t.co/KJW9cwLe7y

By David Shaywitz, MD, PhD
Lifestyle Interventions Are Unreasonably Effective, Says Thrive Summit
SocialMar 23, 2026

Lifestyle Interventions Are Unreasonably Effective, Says Thrive Summit

In my recent Thrive Summit talk, I described the "unreasonable effectiveness of lifestyle interventions" (w suitable nod to Eugene Wigner). @zakkohane @hjluks

By David Shaywitz, MD, PhD
New Book,
SocialMar 21, 2026

New Book,

So much sense in @BStulberg's new bk, his pcast (https://t.co/ey4VY9wMjp), and his blog (https://t.co/sI0tw6G2Py); the latest entry, w @stevemagness, lines up remarkably well with key message I tried to impart this week in my keynote at @PersonifyHealth Thrive Summit, vide...

By David Shaywitz, MD, PhD
Grateful for Insightful, Sanity-Providing Commentary Crew Thursday Show
SocialMar 20, 2026

Grateful for Insightful, Sanity-Providing Commentary Crew Thursday Show

Always appreciate the insight, perspective and much-needed sanity from the crew @Commentary - @jpodhoretz @AbeGreenwald @SethAMandel @elianayjohnson Christine Rosen (& occasionally @EliLake). Thurs show particularly good -> https://t.co/Q7TfaWmS0N. Keep on keeping on!

By David Shaywitz, MD, PhD
Success = Persistence, Failure = Obstinacy—Pursue Conviction
SocialMar 19, 2026

Success = Persistence, Failure = Obstinacy—Pursue Conviction

I suspect the only truly honest answer is: retrospectively. With the catch that you need to pursue whatever you're doing with conviction. Like Folkman explained, "If your idea succeeds, everybody says you’re persistent. If it doesn’t, you’re obstinate."...

By David Shaywitz, MD, PhD
Top Nonfiction Picks: Magic of Code and A Giant Leap
SocialMar 14, 2026

Top Nonfiction Picks: Magic of Code and A Giant Leap

Good non-fiction choices include: Magic of Code (essays) - @arbesman A Giant Leap - @Bob_Wachter

By David Shaywitz, MD, PhD
AI Is Reshaping How We Write Code
SocialMar 13, 2026

AI Is Reshaping How We Write Code

Outstanding and astute @nytimes mag article on transformation of coding by AI -> https://t.co/RYgmHb9hIM cc @zakkohane

By David Shaywitz, MD, PhD
Institutional AI Masks Bias Behind Seeming Objectivity
SocialMar 12, 2026

Institutional AI Masks Bias Behind Seeming Objectivity

Dilemma=what @zakkohane explicitly highlights https://t.co/NdSHzoeKAU -institutional AI's will provide seemingly objective guidance in a fashion directly shaped by often tacit institutional values. Recs may seem to carry force of omniscient intel but is informed by instit bias.

By David Shaywitz, MD, PhD
Individual AI Fuels Chaos; Organizational AI Drives Productivity
SocialMar 12, 2026

Individual AI Fuels Chaos; Organizational AI Drives Productivity

V intrstng/disturbing post contrasting individual AI (described as ~enhancing chaos & bringing heat >>>> light) vs organizational AI (force for productivity & good, in this scheme). Couldn't stop thinking abt @zakkohane on AI & values when I saw this fig....

By David Shaywitz, MD, PhD