Re: New to water fasting - Asking for advice

I found this on livestrong:

"At some point, usually between 48 to 72 hours after the start of the fast, the body realizes that taking glucose from the muscles is too wasteful. The body then goes through a process known as ketosis, where the liver produces ketone bodies from fatty acids that the brain can use as fuel; only the red blood cells will continue using the muscles for fuel. This reduces the amount the muscles are used as fuel significantly"

So, in this equation how is vitamin intake (or 'partial eating') going to cause more muscle loss? Vitamins have no energy.