In the absence of GI microbes, central BDNF levels are reduced and this inhibits the maintenance of NMDAR production

Neurochem Res. 2016 Nov;41(11):2819-2835. Epub 2016 Aug 23. Review

https://www.ncbi.nlm.nih.gov/pubmed/27553784

About Robert Zinn

Robert Zinn, M.D., Ph.D. is a medical doctor, physician, and web entrepreneur, who, for over 15 years was employed by academic and research institutions and focused his clinical practices on very specialized patient populations, such as those with rare genetic diseases or rare cancers. He shares his knowledge through his website, NutritionTheory.org

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