The #1 Most Dangerous Fiber in the World
In a Nutshell
Refined fiber, like inulin or chicory root extract, is the most dangerous fiber because it's stripped of polyphenols from whole foods, acting as junk food that lets harmful gut bacteria overgrow, causes SIBO, leaky gut, and even liver cancer (as shown in a 2018 Cell study on mice). Whole-food fiber bound to polyphenols selectively feeds beneficial microbes, producing anti-inflammatory short-chain fatty acids, per research in Journal of Nutritional Biochemistry and Frontiers in Nutrition. Avoid refined fiber supplements and bars; eat colorful whole plants, fermented foods, or try a carnivore reset instead of chasing high fiber intake.
These notes were generated by AI and may contain inaccuracies.
The number one most dangerous fiber in the world is refined fiber. Refined fiber parallels refined sugars and refined carbohydrates: sugar cane starts with vitamins and minerals, which are stripped away to create refined sugar that's bad for humans. Similarly, fiber is for microbes, and refined fiber acts as junk food for them.
Certain fiber in whole form feeds microbes and makes them thrive, while refined fiber harms them. There's a fiber craze where people try to get as much fiber as possible, creating problems for many. Fascinating research shows feeding mice refined fiber leads some to develop liver cancer; the study was published in Cell, one of the most prestigious scientific journals.
When eating a bean, onion, or berry, fiber is physically bound to polyphenols. Every plant on Earth has polyphenols woven together with fiber in the cell wall. They travel together through the digestive system to the gut, where the body breaks them apart. Microbes have evolved over millions of years to receive this unit, not isolated fiber.
Polyphenols are trapped in the fiber and decide which bacteria thrive and which get shut down. > "This is definitely what the fiber supplement industry does not want you to know."
Polyphenols act as air traffic controllers or a guidance system for fiber in the colon, like an airport where bacteria are flights seeking runway access and fuel. Whole fiber with polyphenols directs which microbes get fuel and how much, preventing excess.
Sign in to read the full notes
Get access to AI-generated notes, topic timestamps, and more.