The Science of Fasting

FLEA said
So how far do you run? I run between 5 or 6 miles every other day and then on a weekend I might run 12 -14 miles. How do you refuel your body and muscles? My body cramps up if I don't refuel it with protein after a run. This sounds very interesting I am just not sure it would be good for a person who burns up as many calories as a runner does; as they do not have a lot of (if any)fat reserves and then you would start burning muscle.

Long term fasting would definitely be dangerous if there's no fat reserves. Maybe schedule your fasting days on the days you don't run and eat normally the others. Something like run, eat normally, then skip until dinner the next evening. Then eat normally until after your next run.

But it kind of sounds like you have a healthy diet and exercise routine so I don't know if there'd be benefit to trying it.