Short Wave Should you be fibermaxxing? Here's what the science says
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May 13, 2026 
Berkeley Limketkai, a gastroenterologist who specializes in digestive health, breaks down the science of dietary fiber. He discusses why Americans eat too little, how different fiber types act in the gut, safe ways to raise intake, and pitfalls of added-fiber fads. Expect practical guidance on increasing fiber gradually and tailoring amounts to individual tolerance.
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Most Americans Are Fiber Deficient
- Over 90% of people in the U.S. don't get enough fiber and average intake is only 10–15 grams per day.
- Berkeley Limketkai ties low fiber to the Western diet's reliance on refined carbs, ultra-processed foods, and low vegetable consumption.
Fiber Helps Poop And Feeds Gut Bacteria
- Fiber works mechanically on bowel habits and functionally by shaping the gut microbiome and fueling anti-inflammatory molecules.
- Limketkai emphasizes both stool-forming effects and microbiome-derived benefits as separate mechanisms.
Not All Fiber Is The Same
- Not all fibers act the same; different fibers promote different bacteria and can produce different metabolites.
- Some fiber types may even be harmful or pro-inflammatory in certain disease states.