Misleading & Factless? Translate This Page: Ten Fasting Physicians Praise FCI's Juice-Fasting Program and Professional Supervision! IRONICALLY, FEW PHYSICIANS KNOW that all three Fathers of Western Medicine practiced and prescribed prolonged fasting-- Hippocrates , Galen and Paracelsus (who concluded, nearly 500 years ago, that: "Fasting is the greatest remedy--the physician within!" ).