Eli5: Why do we puke when we *see* something disgusting, although there’s no sign it has actually entered or interfered with our body?
In: Biology
I’d like to note something important: The neurologically machinery that causes you to vomit at certain stimuli has no way to know whether it’s entered your body or not. It’s not sophisticated enough to take into account your conscious memories. It’s a (almost literal) knee-jerk reaction to the part of our brain that registers disgust being activated.
As amazing as our nervous systems are, they’re still very, very limited in many important ways. Much to the contrary of what “Intelligent Design” advocates would have you believe, we are very noticeably *not* the product of careful, deliberate design, but are in fact the product of the slow accumulation of whatever random mutations happened to turn out to be useful over the last billion years.
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