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Readers intrigued by ancient animals’ bones

Your letters and comments on the November 11, 2017 issue of Science News

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12:11pm, November 1, 2017

Gut feelings

Tests in mice show that microbes in the gut may tamper with the production of tiny molecules in brain regions known to help control anxiety, Maria Temming reported in “How gut bacteria may affect anxiety” (SN: 9/30/17, p. 12).

Online reader Amanda wondered what has more influence: gut bacteria on anxiety, or anxiety on the bacterial makeup of the gut. If bacteria have more of an effect on anxiety, she asked whether it could be treated with diet rather than drugs.

Researchers are still working out the details of the gut-brain connection, says Gerard Clarke, a psychiatrist at University College Cork in Ireland. Tweaking the gut’s

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