Should I eat dietary fiber?

Our read is that dietary fiber is well-supported for its role in promoting gut health, reducing disease risks, and improving metabolic functions. Experts suggest it acts as a gatekeeper to glucose and carbohydrates, supports a healthy gut microbiome, and is associated with reduced risks of cancer, cardiovascular disease, and mortality.

However, some experts caution that fiber may be detrimental for certain individuals, potentially causing issues like constipation or dysbiosis.

Andrew Huberman suggests consuming sufficient prebiotic fiber through fruits, vegetables, or supplements, and in some cases, taking probiotic capsules.

• 01Peter Attia claims dietary fiber acts as a gatekeeper to glucose and carbohydrates.
• 02Bryan Johnson claims fiber-derived SCFAs, particularly butyrate, can target pro-cancer genes in colorectal cancer cells, potentially triggering cell death.
• 03Bryan Johnson claims dietary fiber is fermented by gut bacteria into short-chain fatty acids (SCFAs), which maintain gut barrier integrity.
• 04Bryan Johnson claims daily consumption of 10g of dietary fiber reduces colon cancer risk by 10%, with legume fibers correlating to a 32% decrease.
• 05Rhonda Patrick claims insoluble fiber promotes gut motility, which is essential for timely nutrient absorption and waste elimination.
• 06Bryan Johnson claims dietary fiber intake is associated with a reduced risk of colon cancer.
• 07Paul Saladino claims identifying and addressing dietary factors that irritate the gut or cause bacterial imbalance, such as starches, soluble fiber, beans, grains, legumes, corn syrup, and food additives, is key to resolving Candida overgrowth.
• 08Andrew Huberman claims consuming sufficient prebiotic fiber through fruits, vegetables, or supplements, and in some cases, taking probiotic capsules, can support a healthy gut microbiome.
• 09Andrew Huberman claims many people in the industrialized world may have a depleted gut microbiome that lacks the necessary microbes to effectively degrade dietary fiber.
• 10Rhonda Patrick claims soluble fiber benefits the gut microbiome, promotes short-chain fatty acid production, lowers LDL cholesterol, and improves glucose metabolism and insulin sensitivity.
• 11Andrew Huberman and Rhonda Patrick claim dietary fiber intake, or fruit and vegetable intake, consistently shows reduced risk of cancer, cardiovascular disease, and mortality.
• 12Rhonda Patrick claims soluble fiber provides a viscous barrier that modulates nutrient absorption and is metabolized by gut bacteria into beneficial metabolites that nourish the gut wall.
• 13Rhonda Patrick claims insoluble fiber decreases gut transit time, reducing the risk of diverticulitis and potentially colon cancer.
• 14Andrew Huberman claims individuals with a diverse gut microbiota that is well-equipped to degrade dietary fiber are more likely to respond positively to high-fiber diets.

Paul Saladino suggests dietary fiber may be detrimental due to constipation, dysbiosis, hormonal changes, and reduced mineral/vitamin bioavailability. Andrew Huberman notes that many people in the industrialized world may have a depleted gut microbiome that lacks the necessary microbes to effectively degrade dietary fiber.

Our read would change if new evidence emerged that broadly contradicted the benefits of dietary fiber or highlighted significant, widespread detriments not currently acknowledged by experts.