David Shaywitz, MD, PhD

David Shaywitz, MD, PhD

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

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