Kefir

Presentation by: Wei (Adelyn) Tsai
Reviewed by: Thia Hanania & Gregory Hollenbeck
Kefir is a traditional fermented dairy beverage originating from the Caucasus
mountains. It is composed of many important probiotic bacterial strains that confer psychobiotic effects (Bourrie et al., 2016; Tillisch et al., 2013). These psychobiotic effects may stem from the ability of kefir to modulate the microbiota-gut-brain axis, and influence neurological functions and cognition (Van De Wouw et al., 2020). In humans, kefir had been shown to ameliorate cognitive dysfunctions in postmenopausal women and neurodegenerative diseases patients (Ton et al., 2020; Özcan et al., 2019) Given that kefir is usually sold in grocery stores, drinking kefir can be an easily accessible and cost-effective approach to improve our brain health.
Further studies:
1. Mechanisms on how kefir affects microbiota-gut-brain axis
2. Factors affecting the final quality and bacteria composition of kefir, e.g. % kefir grain, temperature
3. Larger and longer randomized controlled studies of kefir in
neurological/neuropsychiatric diseases
References:
Bourrie, B. C. T., Willing, B. P., & Cotter, P. D. (2016). The microbiota and
health promoting characteristics of the fermented beverage kefir. Frontiers in Microbiology, 7(MAY), 1-17. doi.org/10.3389/fmicb.2016.00647
Cryan, J. F., & Dinan, T. G. (2012). Mind-altering microorganisms: The impact of the gut microbiota on brain and behaviour. Nature Reviews Neuroscience, 13(10), 701-712. doi.org/10.1038/nrn3346
Hamet, M. F., Medrano, M., Pérez, P. F., & Abraham, A. G. (2016). Oral
administration of kefiran exerts a bifidogenic effect on BALB/c mice intestinal microbiota. Beneficial Microbes, 7(2), 237-246. doi.org/10.3920/BM2015.0103
Özcan, H., Oskay, Ü., & Bodur, A. F. (2019). Effects of Kefir on Quality of Life and Sleep Disturbances in Postmenopausal Women. Holistic Nursing Practice, 33(4), 207-213. doi.org/10.1097/HNP.000000000...
Serafini, F., Turroni, F., Ruas-Madiedo, P., Lugli, G. A., Milani, C., Duranti, S.,
Zamboni, N., Bottacini, F., van Sinderen, D., Margolles, A., & Ventura, M.
(2014). Kefir fermented milk and kefiran promote growth of Bifidobacterium
bifidum PRL2010 and modulate its gene expression. International Journal of Food Microbiology, 178, 50-59. doi.org/10.1016/j.ijfoodmicro...
Tillisch, K., Labus, J., Kilpatrick, L., Jiang, Z., Stains, J., Ebrat, B., Guyonnet, D., Legrain-Raspaud, S., Trotin, B., Naliboff, B., & Mayer, E. A. (2013).
Consumption of fermented milk product with probiotic modulates brain
activity. Gastroenterology, 144(7), 1394-1401.e4. doi.org/10.1053/j.gastro.2013...
Ton, A. M. M., Campagnaro, B. P., Alves, G. A., Aires, R., Côco, L. Z., Arpini, C.
M., Guerra E Oliveira, T., Campos-Toimil, M., Meyrelles, S. S., Pereira, T. M.
C., & Vasquez, E. C. (2020). Oxidative Stress and Dementia in Alzheimer’s Patients: Effects of Synbiotic Supplementation. Oxidative Medicine and Cellular Longevity, 2020. doi.org/10.1155/2020/2638703
Van De Wouw, M., Walsh, A. M., Crispie, F., Van Leuven, L., Lyte, J. M.,
Boehme, M., Clarke, G., Dinan, T. G., Cotter, P. D., & Cryan, J. F. (2020). Distinct actions of the fermented beverage kefir on host behaviour, immunity and microbiome gut-brain modules in the mouse. Microbiome, 8(1), 1-20. doi.org/10.1186/s40168-020-00...