what are the advantages of bitter taste?!
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In terms of evolution, bitterness was a sign that something was poisonous. Caffeine, nicotine & other stimulants that we consume (and are bitter in taste) are actually poisons in larger quantities. So, the ability to taste bitterness is an evoltionary safe-guard.
Other Answers:
You know which foods are bitter and you won't eat them or drink them, you can tell other people ahead of time not to eat or drink foods like that.
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