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In: Biology
Much of what we consider “disgusting” is rot, contamination, disease, etc. If diseased/contaminated stuff is around, it is possible we have ingested some of it and put ourselves at risk. Might be best for our long-run survival to expel whatever we can and avoid sickness.
This is part of the reason that some people get an urge to vomit when they see others vomiting. If the other person has eaten something dangerous, it’s possible they themselves have too.
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