system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't we digest tapeworms?

Our bodies are pretty good at digesting lots of things.  How do people get a tapeworm without it being dissolved and used for food?
gpt
It is as simple as them having acid resistant outer skin layer.

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It is the same reason many other things are not digested, for example hair: It simply does not react with anything in the digestive tract. Just like hair, the outer skin of parasitic worms evolved not to react with their hosts digestive secretions.