I think most answers here is wrong. As always people are just guessing. I am not a fecal expert , but just have an interest in gut flora.
1. Fecal matter have not been inside the body. Some stuff is excreted from the body to help digest / absorb the food, but ELI5: fecal matter is food that was not absorbed.
2. When you can get sick by eating fecal contaminated food it is due to getting bacteria that causes a stomach sickness . Eating some of your own gut flora will not make you sick.
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