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Will Bulsiewicz

A board-certified gastroenterologist and gut health author, best known for his book on fiber and the microbiome.

Circuit updated June 17, 2026

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Gastroenterologist Will Bulsiewicz says gluten intolerance is mostly a misdiagnosis, and the real culprit is a carbohydrate called fructans

The Diary of a CEO·Health

Gastroenterologist Will Bulsiewicz says gluten intolerance is mostly a misdiagnosis, and the real culprit is a carbohydrate called fructans

The gut doctor behind a bestselling microbiome book has a study that upends a decade of gluten-free grocery shopping.