“Cut coagulated chicken blood into strips and cook them with chicken broth, soy sauce, vinegar, and starch powder to make a geng. This dish is well suited for the elderly.”
Blood is generally good for the anemic since it is high in bioavailable iron. This makes it probably beneficial to many elderly or anyone of weaker constitution, who are susceptible to the condition. The fact that chicken red blood cells are nucleated also means that you get more nucleic acids than regular blood, which probably doesn’t hurt either if you are already eating it.