Poop is more than just previously ingested fiber, there’s also bile, water and dead bacteria in there making up a good chunk of it’s mass. During fasts people also often end up seeing shedded intestinal lining. So your body can produce bowel movements even without food, the fiber from food just increases your output.
It takes about 36 hours for food to move through the entire colon. All in all, the whole process — from the time you swallow food to the time it leaves your body as feces — takes about two to five days, depending on the individual.
https://www.mayoclinic.org/digestive-system/expert-answers/faq-20058340
If yours is black and weird, we call it black goo. A substance containing heavy metals and poisons that sticks to the intestines and prevents the absorption of nutrients. The smell is either very bad or weird. Also called mucoid plaque.
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nsfw
https://torako.wakarimasen.moe/file/torako/x/image/1604/62/1604622427514.jpg
It is a perfect site for bad bacteria, so it increases the reproduction of these bacteria, upsets the intestinal balance, harms your body and brain. that is, it is like a kind of permanent infection. found in almost every human being. It can only be cured by fasting.
https://www.reddit.com/r/fasting/comments/6daec8/disgusting_question_please_dont_upvote/
https://www.reddit.com/r/fasting/comments/6li7de/yhmmm_so_poop/
Nobody notices, but most of the diesases causes by two things
Your gut and parasites.