The gut microbiome may be a causal factor of kwashiorkor, a form of severe malnutrition, researchers from Washington University in St. Louis report in Science. WashU's Jeffrey Gordon and his colleagues studied the gut microbiomes of 317 Malawian twin pairs until they turned three. They then focused on nine, well-nourished, same-gender twin pairs and 13 same-gender twin pairs in which one twin developed kwashiorkor.

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