You were never ten percent human
25 July 2026
The most repeated fact about your body was never measured. What that should teach you about every health claim you meet next
Read on Gut CheckGut Check · the newsletter
One claim, the actual papers, an honest read
An MD and biostatistician on how the gut microbiome shapes health and disease, and how to tell real evidence from hype. Free, and the sources are always linked so you can check the work.
I read the microbiome papers so you don't have to trust the headlines
13 July 2026
I spent 25 years in cancer drug development.
Read on Gut CheckThe newsletter grew out of the book. Half Human is the long version: seventeen chapters, every claim anchored to a paper, and where the evidence stops, the book stops.