A drop in temperature

In almost two centuries since the German physician Karl Wonder Leach established the body temperature as “normal” at 98.6 ° F, parents and physicians have used it equally as a measure – and often the disease. Intensity of – Estimate
However, over time, and in recent years, lower body temperatures have been widely reported in healthy adults. A 2017 study found that the average body temperature was lower (97.9 کم F) among 35,000 adults in the UK, and a 2019 study found that Americans had a lower body temperature (in Palo Alto, California, anyway). 97 is 97.5 F.

A multinational team of physicians, anthropologists and local researchers led by Michael Goron, UC Santa Barbara Professor of Anthropology and Chair of the Campus Integrative Anthropological Sciences Unit, and a postdoctoral researcher in the same department, Thomas Craft, among others.

There is a shortage. Local population of local horticulturists in Tasmania, Bolivian Amazon. In the 16 years since Grossman, co-director of the Tuxman Health and Life History Project, and fellow researchers studying the population, he has seen a sharp annual drop in average body temperature – 0.09 ° F, as it does today. The body temperature of sesame is about 97 97.7 .7 F

“In less than two decades, we’ve seen the same level of decline as in the United States over almost two centuries,” Goron said. Their analysis is based on a large sample of 18,000 observations of approximately 5,500 adults, and adjusts to a number of other factors that may affect body temperature, such as ambient temperature and body mass.

Anthropological research is published in the journal Science Advances.
“The provocative study, which was conducted in the same population during the civil war, has been showing a drop in body temperature in the United States ever since, and has not been able to explain why this decline occurred,” Guerin said. ” “But it was clear that something could change about human physiology.

One important hypothesis is that we have had fewer infections due to better hygiene, clean water, vaccinations and medical treatment.” I, we were able to test it directly Idea.We have information about the clinical diagnosis and the biomarkers of infection and inflammation at the time each patient was seen.

Although some infections were associated with high body temperature, adjusting for them did not cause a significant decrease in body temperature over time. “And we used the same type of thermometer for most of the study, so it’s not because of the change in instruments,” he said.
Kraft added, “No matter how we do the analysis, there is still a shortcoming.

Even when we limit the analysis to <10% of adults who are diagnosed by doctors. She was completely healthy, yet we observed the same decrease in body temperature over time.

Then there is the important question of why both Americans and Sesame have lost body temperature over time. Extensive data from the team’s long-term research in Bolivia indicate some of the possibilities available. “Compared to the past, modern healthcare may increase and the rate of mild infections may decrease.”

“But while health has generally improved over the past two decades, infections are still widespread in rural Bolivia. Our findings show that a decrease in body temperature alone does not explain the decrease in body temperature.” can do.

People may be better off, so their bodies are doing less to fight infection. Or greater access to antibiotics and other treatments means that the duration of the infection is shorter than in the past. In line with this argument, Goron said, “We found that in the early stages of the study, respiratory infections resulted in higher body temperatures than in recent respiratory infections.”

It is also possible that overuse of anti-inflammatory drugs such as ibuprofen may reduce inflammation, although researchers have found that a temporary decrease in body temperature remains after their analysis, according to biomarkers of inflammation.

“Another possibility is that air conditioning in the summer and heat in the winter do not require us to work so hard to regulate our internal body temperature,” Kraft said. “Although the body temperature of the tsunami changes with the seasons and seasonal patterns, the Tasmanians still do not use any modern technology to help regulate their body temperature. More access to blankets.

Researchers initially found no “magic pill” that could explain the drop in body temperature. “It’s probably a combination of factors – pointing to a better situation,” Goron said.


According to Goron, detecting expected body temperature in the United States, and declining over time, is scratching the heads of many people. Was it a fluke? In this study, Goron and his team confirm that the body temperature is lower than 98.6 ° F, which is found in the United States and outside the United States.

“Bolivia is a rural and tropical region with minimal health infrastructure.” “Our study also gives the first indication that body temperature has dropped even in this tropical environment, where infections still lead to high levels of disease and death.

As an important sign, temperature is an indication of what is happening in the body, like a metabolic thermostat. “One thing we’ve known for a while is that there isn’t always a universal ‘normal’ body temperature for everyone, so I doubt it will affect our findings,” Guerin said. How medical practitioners use body temperature readings in practice. Despite being set at 98.6 F, most physicians agree.That is the ‘normal’ temperature range. During the day, body temperature can vary mostly by 1 as F, which is highest in the early morning to late afternoon. It also varies after menstruation and physical activity and decreases with age.

But by linking widespread epidemiological and socioeconomic improvements to changes in body temperature, this study suggests that information on body temperature can provide indications for the overall health of a population. , Like other common signs of life expectancy. “It’s easy to measure body temperature, and so it can easily be included in a routine large-scale population health monitoring survey,” Guerin said.

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