At around 37°C, the human body is able to use minimal power to maintain a balance of body needs. That is to say, humans can achieve maximum mobility by acquiring a small amount of energy at 37°C. 
for more than a century, 37 ℃ has been regarded as the body temperature standard for human health. However, a recent study revealed that in the past century, human body temperature has been getting lower and lower under normal conditions, about 0.03 ℃ every 10 years.
Modern lifestyles reduce human labor intensity, resulting in a decrease in metabolic rate