Can Fiber Damage Your Liver? @nicknorwitzMDPhD
Can Fiber Damage Your Liver?  @nicknorwitzMDPhD
Uploaded December 2025 | Updated September 2026, 1 week ago
Link: https://open.substack.com/pub/staycuriousmetabolism/p/fiber-is-good-for-you-is-lazy-s[…]kz2&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true

We’re told fiber is always good—but that’s not the full story. A landmark randomized controlled trial from Stanford tested different fiber types and found that one common fiber, when taken at high doses, significantly increased ALT, a marker of liver injury, in a subset of people. The effect was large enough that researchers stopped the study early for safety concerns.

At lower doses, the same fiber may improve insulin sensitivity and reduce fatty liver, highlighting a key takeaway in nutrition science: dose and individual response matter. This isn’t about fear—it’s about context over dogma.

#Fiber #LiverHealth #NutritionScience #MetabolicHealth #InsulinResistance #FattyLiver #Stanford #RCT #HealthScience #PrecisionNutrition #MedicalEducation #StayCurious
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Nick Norwitz MD PhD |

Can Fiber Damage Your Liver?

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