I don't know why the author used that example. The point of fasting is nutritional ketosis and Jobs was known as a fruitarian for a large chunk of his life whi

I don't know why the author used that example. The point of fasting is nutritional ketosis and Jobs was known as a fruitarian for a large chunk of his life which is at direct odds with ketosis. Fasting does have some beneficial outcomes for cancer patients: https://www.scientificamerican.com/article/fasting-might-boost-chemo/ https://www.scientificamerican.com/article/fasting-might-boo... The best source of fasting benefits I've found is Dr. Dom D'Agostino. He's a huge proponent of occasional fasts and the ketogenic diet.