The Science of Fasting

I'll be at 72 hrs with nothing but water at 6pm. It's actually been a breeze...minimal hunger.
Just trying to decide IF I want to take it longer or enjoy a nice meal?
I'm an hour ahead of you. I started on 5pm on Sunday and just hit 72 hours. Going to continue through the rest of Ash Wednesday into the morning, for sure. Haven't decided how long I'll go after that.

Water only, so far. May try to do just raw celery, broccoli and celery if it helps me stretch if for a while longer.