This thread is geared towards people wanting to lose weight. I don't see any problem with a 3 day water fast for such a topic. However, you shouldn't lose any muscle mass and low sugar levels are only a concern if you a disease like Type 1 diabetes. Normal people doing a 3 day fast should be fine.
Muscle guy that promotes 3 day fasting (he has multiple videos on 3 day fasting)
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www.youtube.com
Another muscle guy doing a 5 day fast.
Bodybuilding article on a 60 hour fast
Think fasting is just for dieters or skinny hipsters? Think again. Here's what one coach and meathead discovered by giving up his traditional eating schedule and embracing the hunger!
www.bodybuilding.com
Again, this thread was for people that want to lose weight but if you want to know the results of someone such as a male with a normal near perfect physique, I have provided examples in the link above. You can read and learn about their experiences if you are in that near perfect physique.
A 3 day water fast works for people that are overweight because it eliminates all of your cravings and shrinks your stomach which are two huge issues with people that are overweight.