Is it true that Rats can taste bitterness with their stomaches and how does it work for them?

I'm a rat owner and lover and I came across this question on a game of trivial pursuit on my cellphone.
Answers:
The anatomy supports it: Some cells in the lining of the digestive tract are very similar to "taste bud" cells on the tongue, and experiments show that the gut responds on its own to the sweetness of glucose.

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I'm not much of a scientist, but I'm pretty sure if anything a rat eats that it finds volatile to the very least, they will throw it back up, which played a role in the Black Death.