It's becoming clearer that gut flora, the microorganisms in the digestive tract, is key to pediatric health, according to Dr. Linda Muir, chief of pediatric gastroenterology at the Oregon Health and Science University. Muir said studies supporting fecal transplants for children with ulcerative colitis and enteral nutrition for those with Crohn's disease add to mounting evidence that "the bacteria we carry around in our bodies drive and determine a lot of our health and illness. A lot of autoimmune disorders may be related to [imbalances in our] gut microbiome," she said.

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