French scientists published evidence Thursday of pesticide contamination of lab rat feed which they said discredited historic toxicity studies, though commentators questioned the analysis.
Published in the journal PLOS ONE, the study reported finding pollutants in 13 different types of lab rat food from five continents.

They detected residue of 262 pesticides, four heavy metals, and 22 genetically modified organisms, said the team led by Gilles-Eric Seralini of the University of Caen in Normandy.

This contamination with chemicals whose “toxic effects” are documented, may be the real cause of so-called “spontaneous” diseases developing in lab rats, they said.

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