1851, German doctor Wendrich conducted a survey on 2,500 people and measured the body temperature of the armpit millions. He gave an answer: the average body temperature of humans is 37℃.
Since then, 37℃ has become the world's temperature benchmark. If it exceeds this number, it is considered that the body temperature is high, and if it is below this number, it is considered that the body temperature is low. Of course, whether it is high or low, it is not good for health.
When the body temperature is too high, it is what we often call fever. The most common cause of fever is infectious diseases, such as various viruses, bacteria, and fungal infections. In addition, cancer and rheumatoid immune diseases may also cause fever.
When the body temperature is too low, it is often more dangerous than fever, because when the body temperature is too low, the heart rate is often slowed down, the blood pressure of is reduced, the respiratory rate is slowed down, and even coma occurs.
After a long period of evolution, humans are constant temperature animals, and maintaining a stable body temperature is more conducive to health.
In 2020, Dr. Parsonnet of from Stanford University and his research team analyzed the temperature data of three American populations covering different historical periods. Through a total of 677,423 human body temperature measurement data, they found that from the 19th to the 20th century, the normal body temperature of human was gradually decreasing, down 0.4℃, from 37℃ to 36.6℃.
The arrival of the new crown has made people pay more attention to body temperature. When we enter public places, we almost always measure our body temperature. When the body temperature rises, we will be particularly nervous and afraid, fearing that we will be infected with the new crown.
However, a new study may have subverted many people's perceptions. In 2020, Dr. Parsonnet of Stanford University and his research team analyzed temperature data for three American populations covering different historical periods. Through a total of 677,423 human body temperature measurement data, they found that from the 19th to the 20th century, the normal body temperature of human beings was gradually decreasing, down 0.4℃, and from 37℃ to 36.6℃.

The problem is coming, why is the body temperature of humans falling? Is a good or a bad thing to lose body temperature?
There are many statements about the decline of human body temperature, and there are only two views. The first is the theory of air conditioning. People who hold this view believe that the popularity of air conditioning will make people not cold in winter and not hot in summer, and their energy consumption will significantly reduce, which will cause a continuous drop in body temperature.
The second view is that there is less physical labor and more mental labor. In the past, on the vast land, most of China's population was farmers. Everyone was sweating profusely and the daily labor was very large. Now, the times have changed, and mechanization has replaced more and more hands-on work. The decrease in physical labor and exercise have led to a significant reduction in energy consumption, which will then cause a continuous decline in body temperature.
The new question is, is the health benefit of dropping body temperature?
body temperature is linked to the basal metabolic rate. For every 1℃ increase in body temperature, basal metabolic will increase by 13%. Hypothermia means that basal metabolism will slow down. The slowdown in basal metabolism means that immunity will decrease.
According to scientists' calculations, if the body temperature drops by 1℃, the immunity will be reduced by 30%. Once the immunity drops, our body's ability to resist bacteria and viruses will not only greatly reduce, but even worse, the risk of cancer will also be greatly increased.
From this we can see that the so-called drop in body temperature is actually not a good thing.
People are constant temperature animals. Over the long period of time, our bodies have already adapted to the surrounding environment. Everyone has a temperature regulation center in their body. Its function is to make the body temperature fluctuate within a reasonable range, rather than being too high or too low.
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