Additionally, does this only happen to us or is it prevalent across the animal kingdom?
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Some other thoughts since everyone else has covered the teeth angle:
* Limiting contact with the rest of the stomach contents, such as toxins or bad microbes in the meal, or even “good” microbes that should not be allowed that far ahead of the stomach.
* Lubrication to help expel the vomit.
* Perhaps the body isn’t doing this entirely voluntarily, and the gut flora are causing some of these responses themselves to kick out new competitors.
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