Sounds like we’re going back to the “four humors:”

The “four humors” are a classical theory, developed by ancient Greek physicians like Hippocrates, that suggests human personality and health are determined by the balance of four bodily fluids: blood, phlegm, yellow bile, and black bile. An excess or deficiency of these humors was believed to influence both temperament and susceptibility to illness.

This theory was influential in ancient and medieval medicine, influencing how people understood and treated illness and even personality. While no longer considered a scientifically valid theory of human health, it’s a significant part of the history of medicine and offers a glimpse into ancient philosophical and medical thinking.

Except now we are actually using a contemporary version of it to rule our health care system.