Breaking News! Fiber Still Good for You! | Educational Video | Biolayne

Norton has long advocated dietary fiber on his channel. He presents these two new studies as further confirmation. The dose-response shows steep benefits when moving from very low intakes (<8 g/day) to moderate intakes, with a 7% mortality reduction per 5 g increase. The effects largely plateau at 20–25 g/day, which is achievable with a diet rich in vegetables, legumes, and whole grains. He speculates that women may need less fiber to see a given risk reduction because of smaller body size and estrogen’s cardioprotective effect, meaning men, who have higher baseline CVD risk, gain more protection. Despite the observational nature, Norton underscores that the signal is robust: eat your fiber.

Layne Norton highlights a study on postmenopausal women that found those in the highest tertile of fiber intake had a 15% lower mortality risk compared to the lowest tertile. Among women consuming less than 8 grams per day, every additional 5 grams reduced mortality risk by 7%. A dose-response threshold was observed, with most benefits reached around 20–25 grams per day, and diminishing returns beyond that. A second study examining nearly two million men and women found higher fiber intake lowered chronic disease risk, particularly cancer and cardiovascular disease in men. Strikingly, the protective association was stronger for men than for women, and the threshold for health improvement was lower for women. Norton speculates this may be because women are generally smaller and likely need less absolute fiber, and because estrogen provides cardioprotection, making women’s baseline cardiovascular risk lower, so the incremental benefit of fiber appears reduced. He reiterates that regardless of population, people who consume more dietary fiber live longer and are healthier overall.