

“There is not going to be one single normal temperature for any given person,” he says. Therefore, many people had infections that couldn’t be treated, which would have affected temperatures if they were chronically sick,” says Heidi Zapata, MD, PhD, a Yale Medicine infectious disease specialist.Ī normal temperature is a range that can depend on numerous factors, including not only your health, but your age and time of day, says Elijah Paintsil, MD, a Yale Medicine pediatric infectious disease specialist.

“That original study in the 1860s was done before antibiotics were available. The decline is likely due to changes in our environment and health, which have brought about physiological changes in the body, the researchers say. Elijah Paintsil, MD, Yale Medicine pediatric infectious disease specialist One recent study that looked at 250,000 temperature measurements from 25,000 British patients found the average to be 97.9° F.Ī fever alerts you that something is going on and is the way the body makes itself a less hospitable environment for a pathogen. The researchers examined 27 modern studies about body temperature and found mean body temperature to be lower than 98.6° F across the board. But researchers from Stanford University now suggest that the average body temperature has since declined by about 1.6° F. In 1868, a German physician determined that 98.6°į was a normal body temperature after studying more than a million temperatures from 25,000 people.
