Dr. Emeran Mayer of the University of California, Los Angeles, says that imaging scans show the connections between parts of the brain vary depending on the type of microbes that are found in the gut, suggesting a link between gastrointestinal microflora and brain structure. The study supports other research in animals that suggests connections between gut bacteria and brain chemistry and behaviors. The vagus nerve, which researcher John Cryan calls "the highway of communication between what's going on in the gut and what's going on in the brain," appears to be an important piece in the puzzle.

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