Americans' Body Temperatures Have Been Dropping

A new study has found evidence that the average blood temperature of people in the U.S. has lowered over the past century and a half—probably because we're in better health.

The authors of the new study, published in the journal eLife, looked at the medical records of Americans, including Civil War veterans, from three periods of time: 1860–1940, 1971–1975, and 2007–2017. They found that people's average body temperature, after accounting for things like age, height, and weight, has steadily declined over time, by roughly 0.05 Fahrenheit every decade since the 1860s.

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