Fiber Intake and Metabolic Flexibility
Higher dietary fiber intake remains strongly associated with improved glycemic control, reduced inflammation markers, and enhanced gut microbiome diversity. Emerging research suggests fiber may support metabolic flexibility—the body’s ability to shift between fuel sources efficiently.
Fermentable fibers produce short-chain fatty acids linked to improved insulin sensitivity. Despite consistent recommendations, average fiber intake remains below suggested levels in many regions.
Incremental increases—rather than abrupt overhauls—may improve tolerance and sustainability.
References
Reynolds, Andrew, et al. “Carbohydrate Quality and Human Health: A Series of Systematic Reviews and Meta-Analyses.” The Lancet, vol. 393, no. 10170, 2019, pp. 434–445.
Makki, Karim, et al. “The Impact of Dietary Fiber on Gut Microbiota in Host Health and Disease.” Cell Host & Microbe, vol. 23, no. 6, 2018, pp. 705–715. (Frequently cited in recent metabolic flexibility reviews.)
