There is NO way that is healthy. No way.
It's interesting you say that because the doctor who wrote ETL, which you mention in another post, prescribes intermittent fasting all the time. He's even written a book about it: http://www.amazon.com/Fasting-Eating-Health-Medical-Conqueri...
I do this (48/24) because of the reduced likelihood of a recurrence of cancer. (The cancer I had seems to be accelerated by IGF.)