Fasting for three days can regenerate entire immune system, study finds The thing that really stood out was the following: (Emphasis mine.) How typical. Rather than being excited for a natural method that has the possibility of kick starting a person's immune system, we have the tired old song of "let's find a way to do it with drugs". His membership on the United States Pharmacopeia (USP) Monographs - Biologics & Biotechnology Expert Committee wouldn't have anything to do with that, would it? It'll be interesting to see how this plays out.