The Signal · A weekly briefing from Dr. Marcus Hale, MD

Medicine has a noise problem. This is the signal.

Every Saturday morning, one short essay on what the evidence actually says about living longer and feeling better. No fads, no fear, no fifteen supplements.

Read by 12,000 curious people. Free, every Saturday. Unsubscribe anytime.

Dr. Marcus Hale, physician and author

AS HEARD IN   The Longevity Review  ·  MORNING ROUNDS  ·  Praxis Podcast  ·  THE EXAMINED LIFE  ·  Grand Rounds Weekly

"Most of what you have been told to worry about does not matter. The five things that do are unglamorous, measurable, and mostly free."

MARCUS HALE, MD · FROM THE FIRST ISSUE OF THE SIGNAL

What the briefing covers

No. 01 · Metabolic health
Blood sugar, body composition, and the boring habits that outperform every named diet. What your labs actually mean and which numbers are worth chasing.
No. 02 · Sleep and recovery
The one intervention with no substitute. How sleep architecture works, why trackers mislead you, and what to change before you buy anything.
No. 03 · Evidence literacy
How to read a headline about a study without being fooled by it. Relative risk, healthy user bias, and the questions I ask before I change my advice.
Continuous glucose monitor beside a plate of vegetables

Featured essay

Your glucose monitor is teaching you the wrong lesson.

Continuous glucose monitors turned a clinical tool into a consumer obsession. Here is what the spikes actually mean, when they matter, and why the healthiest response to most of them is to go for a walk and stop looking at your phone.

Read the essay in the archive →

New here? Start with these.

01

Your glucose monitor is teaching you the wrong lesson

Metabolic health · 9 minute read · The most shared issue of The Signal to date.

02

Sleep debt is real. Sleep tracking mostly is not.

Sleep · 7 minute read · Why your ring's "readiness score" deserves less of your attention than your bedtime.

03

The supplement aisle, sorted by evidence

Evidence literacy · 11 minute read · Three things worth buying, and the forty-seven that are expensive urine.

Keynotes and grand rounds

The same signal, delivered from a stage.

Marcus has delivered over 140 keynotes across 12 countries, translating messy evidence into clear decisions for hospitals, conferences, and companies that care about their people.

Saturday mornings, in your inbox.

One essay. Five minutes. The signal, without the noise.