He responded: "How about "miracle of fasting"? It was an American who wrote it."

I actually know about the "Miracle of fasting". Paul Bragg was the author. When I was my eating disorder in my youth, I was into everything distorted: rawfoodism, fasting, and what not. Later on, I browsed Wikipedia and found out that this guy, Paul Bragg, seriously exaggerated his age (by 14 years) to make people believe that his system allows maintaining good physical shape into old age. And that he died of a heart attack. The "miracle" did not work. I related it to D.

I also told my ex, who knows D. a bit (as my friend, not lover), and he immediately pronounced D's methods masochistic and suggested D go into therapy in regards to being mad at the body for stopping to burn food the way it used to. My ex also recommended 45 minutes of sweating using elliptical (for safety, unlike running). I am not sure yet whether I will convey those recommendations to D.