You should read Hotema who explains that we get our energy from cosmic radiation, air and sun, and that food only hampers our bodies' ability to rejuvinate itself. It's a lot to think about, so you really should read it. What you read is a common myth, along the lines of stomach acids burning away your stomach with no food in it, which is BS. I'm not sure how a thought like that is supposed to be supportive! So anyway your body repairs itself when you don't eat. The body would never consume its own healthy cells. It would "expell" unheathly cells I guess.