Rethinking Yogurt’s Probiotic Value: A Comparative Review of Traditional Fermentation and Industrial Processing

Shady Amin ¹*, Khaled El-Tarabily ²

This review clarifies how industrial processing diminishes yogurt’s probiotic quality and underscores the importance of authentic fermentation for true health benefits.

Abstract

Yogurt has long been cherished as a natural probiotic food, yet modern industrial production methods have raised concerns about its genuine probiotic potential. This narrative review explores the evolving nature of yogurt as a health-promoting food by examining differences between traditional fermentation and commercial manufacturing. Scientific literature was analyzed to assess probiotic viability, bacterial strain diversity, processing impacts, and storage stability. Studies focusing on Lactobacillus bulgaricus and Streptococcus thermophilus—the core fermenting bacteria—revealed that traditional yogurt consistently retains higher counts of live, active cultures capable of surviving gastrointestinal transit. Conversely, industrially processed yogurts often undergo pasteurization and include additives such as sugars and preservatives, which substantially diminish probiotic activity. Such practices undermine yogurt’s intrinsic health benefits, including microbiota balance, enhanced digestion, immune modulation, and nutrient absorption. The findings reveal a persistent disconnect between consumer perceptions of “probiotic yogurt” and the biological reality of many commercial products. Misleading labeling and inconsistent regulatory definitions further blur this distinction, resulting in consumer confusion and diminished trust in functional foods. This review emphasizes that only yogurts with verified live cultures and minimal processing should qualify as authentic probiotic foods. Ultimately, the restoration of traditional fermentation practices and transparent labeling is essential for reclaiming yogurt’s probiotic integrity and optimizing its health value.

Keywords: Yogurt, Probiotics, Gut Microbiota, Live Cultures, Fermentation

References

Bravo, J. A., Forsythe, P., Chew, M. V., Escaravage, E., Savignac, H. M., Dinan, T. G., ... & Cryan, J. F. (2011). Ingestion of Lactobacillus strain regulates emotional behavior and central GABA receptor expression in a mouse via the vagus nerve. Proceedings of the National Academy of Sciences, 108(38), 16050-16055.

Fattahi, S., Amini, S., Mirzaei, H., & Mostafaie, A. (2014). The effects of probiotic yogurt on symptoms of irritable bowel syndrome: A randomized controlled trial. World Journal of Gastroenterology, 20(24), 8745-8752.

Foster, J. A., & McVey Neufeld, K. A. (2013). Gut-brain axis: How the microbiome influences anxiety and depression. Trends in Neurosciences, 36(5), 305-312.

Gänzle, M. G. (2015). Lactic metabolism revisited: Metabolism of Lactobacillus species in food fermentations and their implications for food quality and human health. Current Opinion in Food Science, 2, 56-62.

Granato, D., Branco, G. F., Nazzaro, F., Cruz, A. G., & Faria, J. A. F. (2010). Functional foods and non-dairy probiotic food development: Trends, concepts, and products. Comprehensive Reviews in Food Science and Food Safety, 9(3), 292-302.

Hadjimbei, E., Botsaris, G., & Chrysostomou, S. (2022). Beneficial effects of yoghurts and probiotic fermented milks and their functional food potential. Foods, 11(17), 2691.

Hill, C., Guarner, F., Reid, G., Gibson, G. R., Merenstein, D. J., Pot, B., ... & Sanders, M. E. (2014). The International Scientific Association for Probiotics and Prebiotics consensus statement on the scope and appropriate use of the term probiotic. Nature Reviews Gastroenterology & Hepatology, 11(8), 506-514.

Kau, A. L., Ahern, P. P., Griffin, N. W., Goodman, A. L., & Gordon, J. I. (2011). Human nutrition, the gut microbiome, and immune system: The intersection of host metabolism and microbial ecology. Proceedings of the National Academy of Sciences, 108(1), 460-467.

Kok, C. R., & Hutkins, R. (2018). Yogurt and other fermented foods as sources of health-promoting bacteria. Nutrition reviews, 76(Supplement_1), 4-15.

Laird, E., Molloy, A. M., McNulty, H., Ward, M., McCarroll, K., Hoey, L., ... & Casey, M. C. (2017). Greater yogurt consumption is associated with increased bone mineral density and physical function in older adults. Osteoporosis International, 28(8), 2409-2419.

Maggio, M., Guralnik, J. M., Longo, D. L., & Ferrucci, L. (2013). Interleukin-6 in aging and chronic disease: A magnificent pathway. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 68(5), 461-469.

Malagón, R., González, J. L., & García, E. (2008). Probiotic yogurt consumption improves immune response in healthy individuals. Journal of Dairy Science, 91(6), 2118-2124.

Myrick, J. (2025, February 10). Best Probiotic Yogurt: 10 Best Probiotic Yogurts. Sporked. https://sporked.com/article/best-probiotic-yogurt/

Schrezenmeir, J., & de Vrese, M. (2001). Probiotics, prebiotics, and synbiotics—Approaching a definition. The American Journal of Clinical Nutrition, 73(2), 361S-364S.

Turnbaugh, P. J., Ley, R. E., Mahowald, M. A., Magrini, V., Mardis, E. R., & Gordon, J. I. (2006). An obesity-associated gut microbiome with increased capacity for energy harvest. Nature, 444(7122), 1027-1031.

Vedamuthu, E. R. (2013). Starter cultures for yogurt and fermented milks. Manufacturing yogurt and fermented milks, 115-148.

Wallace, C. J. K., & Milev, R. (2017). The effects of probiotics on depressive symptoms in humans: A systematic review. Annals of General Psychiatry, 16(1), 14.

Yano, J. M., Yu, K., Donaldson, G. P., Shastri, G. G., Ann, P., Ma, L., ... & Hsiao, E. Y. (2015). Indigenous bacteria from the gut microbiota regulate host serotonin biosynthesis. Cell, 161(2), 264-276.

Yogurt. (2025, March 4). In Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Yogurt