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Why we feel emotions in our guts, and what microbes have to do with it

Why we feel emotions in our guts, and what microbes have to do with it

In the dark, oxygen-free zone of our large intestines, a vast community of life is flourishing. Scientists say there are more than 100 trillion microbes living there, and if you gathered them all together, they would weigh more than our brains.

In his new book, “The Mind-Gut Connection,” Dr. Emeran Mayer explains how these microscopic organisms insert themselves into the running dialogue between the brain and the gut. In the process, he says, they help determine how stressed out we get, when we get sick and how quickly we...

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