Good breakdown by the brothers at the ME Diet of why intermittent fasting (IF) might not be good for you. IF works great for some people, other not. I've tried it several times now including 24 hour fast, but it was very hard never could settle into a pattern. Always massive hunger at the end.
Intermittent Fasting Diet: Why it’s NOT the weight loss fix you think it is
http://www.metaboliceffect.com/intermittent-fasting-diet/