[maxhs]

It's perfectly healthy. as a sidenote: you can mimic those effects through exercise (and a smaller window of caloric restriction). I've had some great mid-distance runs on no calories for the prior 6-8 hours (they felt great.. but I couldn't have gone much further given the low glycogen).

The people who've posted here might also be interested in checking out PaleoHacks, they've had some interesting threads on IF: http://paleohacks.com/search?q=intermittent+fasting#axzz1I0z...

[delinquentme]

absolutely! swimming but i just thought its kind of wild how after a certain point the body acclimates.