U.S. Fiber Gap Persists Despite Health Benefits, New Study Highlights Role of Fermented Foods

Only 4 % of U. S. adults meet the recommended 25 g of fiber per day for women and 38 g for men, while the national average sits at 16 g. Research links high‑fiber diets to lower cardiovascular disease, colorectal cancer, and improved arthritis symptoms. Fiber comes in many forms: viscous fibers like psyllium form a gel that promotes satiety, lowers cholesterol, and regularizes bowel movements; fermented fibers such as inulin are processed by gut bacteria to reduce inflammation. A 2021 study of 36 healthy adults found that those on a high‑fiber diet had gut microbes that produced more fiber‑breaking enzymes, whereas a high‑fermented‑food diet increased bacterial diversity and lowered inflammatory markers. Practical guidance recommends increasing fiber gradually, staying hydrated, and mixing whole foods with supplements or added‑fiber products to find what works best for each individual.