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trying to understand. "We're just scraping the surface: says McMaster University gastroenterologist Premysl Bercik, MD. 'Definitely the animal data suggest that bacteria can have profound effects on behavior ... potency of the so-called -microbiome-gut-brain axis." published in Gastroenterology in 2011. Bercik and colleagues gave BALB/c mice, a strain of mice that are typically timid ... antibiotics, dramatically changing the composition of their gut bacteria. "Their behavior completely changed," Bercik says. 'They became bold and adventurous' The antibiotic treatment also boosted levels of brain-derived neurotrophic