15 Prebiotic Foods Scientists Say Feed Your Gut Bacteria (Most People Eat Zero)
Your gut microbiome contains roughly a thousand different microbial species — and what you eat today determines which of those species thrive. In this episode, Clara Hartley — registered nurse and botanical researcher — walks through fifteen of the most evidence-supported prebiotic foods, ranked by mechanism and practicality.
From the highest inulin concentration in the food supply (Jerusalem artichoke) to the retrograded resistant starch you can generate in your own refrigerator overnight, this is a practical, mechanism-first guide to feeding your gut bacteria intentionally.
Topics covered include inulin, FOS, beta-glucan, resistant starch types 1, 2 and 3, polyphenol modulation of microbial communities, the role of Akkermansia muciniphila in gut barrier function, and the short-chain fatty acid production cascade that links dietary fibre to systemic inflammation markers.
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SCIENTIFIC SOURCES & FURTHER READING:
Roberfroid, M. et al. (2010). Prebiotic effects: metabolic and health benefits. British Journal of Nutrition, 104(S2), S1–S63.
Deleu, S. et al. (2021). Short chain fatty acids and its producing organisms: An overlooked therapy for IBD? EBioMedicine, 66, 103293.
Baxter, N.T. et al. (2019). Dynamics of Human Gut Microbiota and Short-Chain Fatty Acids in Response to Dietary Interventions with Three Fermentable Fibers. mBio, 10(1).
Dahl, W.J. & Stewart, M.L. (2015). Position of the Academy of Nutrition and Dietetics: Health implications of dietary fibre. Journal of the Academy of Nutrition and Dietetics, 115(11), 1861–1870.
Dao, M.C. et al. (2016). Akkermansia muciniphila and improved metabolic health during a dietary intervention in obesity. Gut, 65(3), 426–436.
Gibson, G.R. et al. (2017). Expert consensus document: the International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on the definition and scope of prebiotics. Nature Reviews Gastroenterology & Hepatology, 14(8), 491–502.
Sonnenburg, E.D. & Sonnenburg, J.L. (2014). Starving our microbial self: the deleterious consequences of a diet deficient in microbiota-accessible carbohydrates. Cell Metabolism, 20(5), 779–786.
Mitsou, E.K. et al. (2017). Adherence to the Mediterranean diet is associated with the gut microbiota pattern and gastrointestinal characteristics in an adult population. British Journal of Nutrition, 117(12), 1645–1655.
8a. Tosh, S.M. (2013). Review of human studies investigating the post-prandial blood-glucose lowering ability of oat and barley food products. European Journal of Clinical Nutrition, 67(4), 310–317. (Beta-glucan dose and metabolic response reference.)
Tan, J. et al. (2014). The role of short-chain fatty acids in health and disease. Advances in Immunology, 121, 91–119.
McDonald, D. et al. (2018). American Gut: an Open Platform for Citizen Science Microbiome Research. mSystems, 3(3). (Source for 30 plants/week diversity data.)
Dhingra, D. et al. (2012). Dietary fibre in foods: a review. Journal of Food Science and Technology, 49(3), 255–266.
Topping, D.L. & Clifton, P.M. (2001). Short-chain fatty acids and human colonic function: roles of resistant starch and nondegradable dietary fiber. Physiological Reviews, 81(3), 1031–1064.
Moerman, D.E. (1998). Native American Ethnobotany. Timber Press. (Dandelion, ramp foraging traditions.)
Birt, D.F. et al. (2013). Resistant Starch: Promise for Improving Human Health. Advances in Nutrition, 4(6), 587–601.
Sender, R., Fuchs, S. & Milo, R. (2016). Revised Estimates for the Number of Human and Bacteria Cells in the Body. Cell, 164(3), 337–340.
Educational content only. Studies referenced are preclinical or limited in human scope. Nothing in this video constitutes medical advice. Consult your healthcare provider before using any herbal preparation therapeutically, especially if you take prescription medication.
Some video footage used in this content is sourced from Vecteezy.
I do not claim ownership over third-party materials.