David Shaywitz, MD, PhD

David Shaywitz, MD, PhD

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

Espresso Prices Have Skyrocketed, Data Shows
SocialMay 4, 2026

Espresso Prices Have Skyrocketed, Data Shows

If you think your espresso is getting ridiculously expensive... here's some data to back you up: https://t.co/GbFrhwLLFI

By David Shaywitz, MD, PhD
Spotify CEO Shares Broad Insights on AI, Entrepreneurship, Free Speech
SocialMay 4, 2026

Spotify CEO Shares Broad Insights on AI, Entrepreneurship, Free Speech

One of the best ep of @HarryStebbings @twentyminutevc (& it's a high bar) feat @Spotify CEO @tobi who offered such great perspective on a remarkably wide range of topics, from AI to entrepreneurship to free speech; remarkably resonant. https://t.co/ZPCgIMd1G8 @zakkohane...

By David Shaywitz, MD, PhD
Deep Learning Unlocks Untapped Prevent
SocialMay 3, 2026

Deep Learning Unlocks Untapped Prevent

Latest @EricTopol https://t.co/cPXyNN0DOe (v.i.) highlights DL-enabled oppys to gather additional health insights from imaging medical establishment isn't taking advantage of. Thru dif lens, describes meaningful preventive hlth oppy for entreps. @DanielSodickson @NathanPriceSci https://t.co/UC5Sgn6WR4

By David Shaywitz, MD, PhD
AI's Measured Impact on Biopharma R&D Remains Limited
SocialMay 2, 2026

AI's Measured Impact on Biopharma R&D Remains Limited

My 2c on this highly relevant @Loftus @WSJ on ai in biopharma R&D, an article that offers generally measured assessment of ai impact so far, and will not come as surprise to regular @timmermanreport readers…-> https://t.co/KPigSAw5RC

By David Shaywitz, MD, PhD
Equipment, Training, and Mindset Drive Faster Marathons
SocialApr 30, 2026

Equipment, Training, and Mindset Drive Faster Marathons

Real ? for @stevemagness @BStulberg @DKThomp: when you look at the constantly improving rates of marathon completion, for example, and obv thinking of the sub-2hr times just achieved, how much do you attribute to: - Better equipment - Better training -...

By David Shaywitz, MD, PhD
Harvard Med Mission Revision Deemed
SocialApr 27, 2026

Harvard Med Mission Revision Deemed

Pleased to have the opportunity to share my perspective w @thecrimson on the revised @harvardmed mission statement, an update I thought was eminently reasonable. https://t.co/AQFC5AZd6p My full quote below; sentences 2 & 3 used in story. @zakkohane https://t.co/m8TQTzMqYZ

By David Shaywitz, MD, PhD
Guide Echoes Core Principles of Personal Agency
SocialApr 27, 2026

Guide Echoes Core Principles of Personal Agency

Just really love this, from @hjluks - in his guide to help people get going (https://t.co/yxAEqtfvwB). This absolutely resonates w so much of what @BStulberg emphasizes in his writing, and what i've emphasized in my discussions about agency at https://t.co/ei8N0w3ou4....

By David Shaywitz, MD, PhD
Spam Texts Masquerading as Friends Signal Platform's
SocialApr 26, 2026

Spam Texts Masquerading as Friends Signal Platform's

Latest sign of the end of x: overwhelming number of spam private text messages supposedly from people I know, but in fact, pure spam/phishing

By David Shaywitz, MD, PhD
United's Spotty Wi‑Fi Gets Starlink Upgrade Hope
SocialApr 23, 2026

United's Spotty Wi‑Fi Gets Starlink Upgrade Hope

Apparently @united upgrading WiFi to @Starlink @elonmusk - can’t happen soon enough bc service is spotty to the point of embarrassment; no idea how so many Bay Area tech folks (big users of united) put up with it.

By David Shaywitz, MD, PhD
Military Ends Mandatory Flu Shots, Reversing Centuries‑Old Policy
SocialApr 21, 2026

Military Ends Mandatory Flu Shots, Reversing Centuries‑Old Policy

1/2 The military moving backwards on vaccines (recent announcement making flu vax no longer mandatory) reverses a long history that goes back to Washington and smallpox, and has continued to the (almost) present day - see below from @EvidenceOpen ...

By David Shaywitz, MD, PhD
Our Bodies Accumulate DNA Replication Errors over a Lifetime
SocialApr 21, 2026

Our Bodies Accumulate DNA Replication Errors over a Lifetime

Your DNA replicates a lot between the time you're a fertilized egg and the 30T or so (human) cells in your adult body; fidelity is high but not perfect. In today's @WSJ I review a new book taking a deep...

By David Shaywitz, MD, PhD
Comprehensive New Book Explores Somatic Mutation
SocialApr 20, 2026

Comprehensive New Book Explores Somatic Mutation

Just out - my latest @WSJBooks review - a new book offering comprehensive consideration of somatic mutation -> https://t.co/ptkWfPKemN @zakkohane

By David Shaywitz, MD, PhD
New Book Traces DeepMind’s Rise in AI History
SocialApr 20, 2026

New Book Traces DeepMind’s Rise in AI History

This is a fantastically interesting ep of Ground Truth as @EricTopol interviews @scmallaby about Mallaby's new book The Infinity Machine - intellectual history of AI focused on @demishassabis & @GoogleDeepMind. https://t.co/uudKbqUKF6 cc @zakkohane @CadeMetz

By David Shaywitz, MD, PhD
Primary Care's Heart: Connection, Stories, and Human Agency
SocialApr 15, 2026

Primary Care's Heart: Connection, Stories, and Human Agency

Lovely final ep of @LisaRosenbaum17's perceptive @NEJM NOS pcast series on primary care: https://t.co/vYhK3QN5ce Ep has it all for me: agency, SDT, call of stories, limitations of metrics, value of connection & longitudinal relationships; cx of medicine; warmth; love. @zakkohane

By David Shaywitz, MD, PhD
Early GLP‑1 Rodent Studies Showed Weight Loss Before Diabetes Focus
SocialApr 15, 2026

Early GLP‑1 Rodent Studies Showed Weight Loss Before Diabetes Focus

I don't think this is correct from @nytimes op-ed on GLP-1s - wt loss known from early rodent studies involving injection into CSF as I recall. DM2 more tractable as initial pharma indication, esp at that time - many still...

By David Shaywitz, MD, PhD
Podcasts Lose Appeal as Ads Overwhelm Content
SocialApr 13, 2026

Podcasts Lose Appeal as Ads Overwhelm Content

Starting to find podcasts way less enjoyable than I used to now that they are increasingly stuffed full of ads - at times feels like more ads than content.

By David Shaywitz, MD, PhD
Busy Biotech Day Highlights Promising Advances and Insightful Commentary
SocialApr 13, 2026

Busy Biotech Day Highlights Promising Advances and Insightful Commentary

As usual, excellent summary by @ldtimmerman @timmermanreport of busy and promising biotech news day - as always delivered w insight and heart (especially thoughtful comments re: revmed drug in context of poignant recent @BenSasse interview)

By David Shaywitz, MD, PhD
Denial Delays Fuel Physician Burnout and Payor Tension
SocialApr 13, 2026

Denial Delays Fuel Physician Burnout and Payor Tension

Having seen so many MD requests for either prescriptions or procedures reflexively denied initially, and requiring considerable additional effort from MDs office to get coverage, it's easy to appreciate both MD burnout and hostility towards payors.

By David Shaywitz, MD, PhD
Alpha‑gal Allergy: Tick Bites Turn Meat Into Danger
SocialApr 13, 2026

Alpha‑gal Allergy: Tick Bites Turn Meat Into Danger

Fascinating episode of the always fun @TheSporkful pcast, usually focused on an interesting aspect of food, today - it's medical epi, a really engaging, scary, interesting story about alpha gal https://t.co/zZFGjJ1gdl featuring red meat & Lone Star ticks. @ValStoneMD @mvhospital_

By David Shaywitz, MD, PhD
Aging Unavoidable, But Your Agency Shapes Its Impact
SocialApr 11, 2026

Aging Unavoidable, But Your Agency Shapes Its Impact

Essential 🧵 from @hjluks - aging may not be optional but the way you approach & respond to it is-profound opportunities as he describes to significantly mitigate many of the effects. Central here is **agency**-recognizing all you can do, &...

By David Shaywitz, MD, PhD
WHOOP AI Coach Shares Worthy Amb
SocialApr 10, 2026

WHOOP AI Coach Shares Worthy Amb

Encouraged to see this perspective (articulated as an ambition-and I’d argue a very worthy one) from @WHOOP’s AI coach in response to question… @EmilyBreslow @willahmed https://t.co/YTdRL7pIgh

By David Shaywitz, MD, PhD
Prioritize Any Exercise Over Ideal Balance
SocialApr 8, 2026

Prioritize Any Exercise Over Ideal Balance

Love this from Eric Verdin @BuckInstitute highlighting evidence base for health value of exercise. Would strongly emphasize value of some exercise vs obsessing w "ideal balance" (cc @BStulberg , @ZekeEmanuel) Also remember sleep, nutrition; also connection/purpose, agency https://t.co/N6QYgecYjR

By David Shaywitz, MD, PhD
DC Residents Skeptical of AI, Prioritize Patient Safety
SocialApr 8, 2026

DC Residents Skeptical of AI, Prioritize Patient Safety

Was speaking yesterday abt AI w talented & engaged residents+fellows who are training in DC-wow-at least in this group, not a lot of love for AI... Far more concerned abt harm-to pts, to practice, to envt-striking. Role of age, politics,...

By David Shaywitz, MD, PhD
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