I don't take a lot of dumps, once a day. I don't do a lot of 24hr+ fasts, my regular schedule is eating once a day and eating a lot, I might do a 24 hour fast once or twice a month. But whenever I do I'm not gonna be taking any dumps if no food is coming in.
The way I see it more or less is humans can run on different fuels: fats, sugars, carbs, proteins.
If you don't eat anything you're not gonna die right away, your body is gonna "burn" your fat storages.
I'm slim but even someone like me has a bit of body fat to spare.
I did some digging in my picture files and found some pics I took during a 4-day fast, water and watermelon juice only, this is the first day:
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This is on the 4th day:
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(In b4 clean your crack house)
Went from 165 lbs to 154lbs.