That's a treadmill. You have to eat and drink more micro plastics to replace the lost blood. Bloodletting was the opposite you wanted to do with melancholic illness btw. You wanted to increase sanguine humor(blood, the opposite of black bile) so you ate and drank sanguine foods(meat and gravy, red wine) while taking laxatives and enemas.

Hilariously there is one aspect of this that is actually accurate to modern suggestions. To increase sanguine humor you should exercise and get hot and sweaty (sanguine humor is considered hot and wet). Vigorous exercise is considered by modern medicine to be good for depression.