I personally don't think doing this for a long period of time is healthy. It is also a fact that your body WILL lose lean tissue doing this. Almost anyone who loses a significant amount of weight will lose a lot of muscle and even bodybuilders who diet down with the intention of losing as little muscle as possible usually lose some. If you go on a "fat fast" ( eat 1000 calories of fat or so a day and nothing else) you might not lose muscle but not eating anything you certainly will.
I am also not religious, so fasting in The Bible or the Quran or Dianetics or Atlas Shrugged or whatever book is the bible of choice means nothing to me.
However I DID decide to try this for a short period. I decided to see if I could for 24 hours and I am now 45 hours in. I will break it at 48 hours by eating some soup. I don't know if it had any benefit, but I think continuing would cause me some harm. I think I mostly was just testing my discipline and follow through. When 24 hours was so easy, I just decided to try 48, but that will be it.
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