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ScienceDaily (May 17, 2011) — For the first time, researchers at
McMaster University have conclusive evidence that bacteria
residing in the gut influence brain chemistry and behaviour.
The findings are important because several common types of
gastrointestinal disease, including irritable bowel syndrome,
are frequently associated with anxiety or depression. In
addition there has been speculation that some psychiatric
disorders, such as late onset autism, may be associated with
an abnormal bacterial content in the gut.
"The exciting results provide stimulus for further investigating
a microbial component to the causation of behavioural
illnesses," said Stephen Collins, professor of medicine and
associate dean research, Michael G. DeGroote School of
Medicine. Collins and Premysl Bercik, assistant professor of
medicine, undertook the research in the Farncombe Family
Digestive Health Research Institute.