Vampires work like this…

"It's nothing to be afraid of. It's simple lifestyle choice, a dietary system, and one that has considerable benefits."

That how Dr. Max Shreck starts his book "The Health Secrets Of A Hematopathic Doctor" (1967). In it, he described how his health had not much improved by becoming a vegetarian and how this led him to try a completely liquid food regime, consisting entirely of blood. He said:

"The results were electrifying, within a few days I felt much stronger...