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Technology of Craftsmanship
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[ link to www.livescience.com (secure)] Has the Average Human Body Temperature Always Been the Same?
Evidence suggests that modern humans may be cooler than our 19th-century ancestors.
Today, we don't have all these bugs swimming through our bodies and revving our immune systems into overdrive. Parsonnet wondered how the loss of these microorganisms has altered human physiology through time.
To find out, Parsonnet and her co-authors dug through the data, including data sets from the American Civil War, the 1970s and the early 2000s. With these data sets combined, the researchers accrued more than 677,000 temperature measurements to examine.
Perhaps our decreased body temperature likely reflects the historical decline in infectious disease rates — a trend that reduced excess inflammation in the human body to a significant degree, the researchers wrote in the study. Inflammation produces proteins called cytokines that ramp up the body's metabolic rate, thus generating heat.
Related: Why Do I Sweat So Much?
Additionally, unlike our ancestors, many people now live in a largely temperature-controlled world. "We don't have to work very hard to maintain our body temperature; it's always 70 F (21.1 C) in our houses," Parsonnet said. Microbes say a tree is never just a tree Species of man topic with weather Now mithra and the bull Or weather and sun mythology is apt
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