Gut science is radically changing what we know of the human body

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An accurate but less-than-riveting title for Brett Finlay and Marie-Claire Arrieta’s bestselling book for parents published this past September could have been: Enhancing Environmental Biodiversity for Optimizing Pediatric Gut Microbiome Health. Instead, Dr. Finlay, a professor of microbiology at the University of British Columbia, and Dr. Arrieta, an assistant professor of physiology and pharmacology at the University of Calgary, wisely decided on the much snappier Let Them Eat Dirt: Saving Your Child from an Oversanitized World.