What exactly does "human blood steamed bread" mean?

Satire is the act of taking advantage of the misfortune of others to gain benefits.

BACKGROUND: Chinese medicine stopped using human blood as medicine in the Ming Dynasty (although human blood was used as medicine before, it was not used to kill people, and human blood steamed bread was the product of superstition).

Especially after the publication of Compendium of Materia Medica, Li Shizhen's idea of explicitly opposing the use of human blood or human organs as medicine has been widely recognized in the field of traditional Chinese medicine, so basically no doctors have used human blood as medicine since then, but there are still unreasonable people or quacks who are superstitious about using human blood to treat tuberculosis and other diseases in some areas.

Related to it:

There are horror novels and horror videos (such as red steamed bread and green steamed bread) containing such words.

Lu Xun's article "Medicine" mainly tells the story of human blood steamed bread, mainly expressing people's ignorance and feudal superstition under the specific historical background at that time.

Yuan Mei (Qing) recorded in the article "Return My Blood" in Zi Wuyu: "Yang actually broke the contract, thinking that human blood dipped in steamed bread can cure dysentery, so he took blood." The disease of tuberculosis is consumption, so is tuberculosis.