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Gut Instinct

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Science  17 Jan 2014:
Vol. 343, Issue 6168, pp. 241-243
DOI: 10.1126/science.343.6168.241

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In northern Tanzania, anthropologist Jeff Leach is studying the Hadza, one of the last true hunter-gatherer communities in Africa. Working with a team of microbiologists in the United States, Leach wants to determine the composition of the bacteria living in their guts; he suspects the Hadza's intimate contact with a huge variety of microbial species may protect them from certain "modern" diseases.