It’s a thing called habituation.
basically, nerves are at their most sensitive when they aren’t really being used.
So, when you start eating something sweet, your taste buds for sweetness begin to lose their sensitivity.
Meanwhile, your taste buds for bitterness are still as sensitive as ever.
So, if you then taste something that’s less sweet and more bitter, you won’t taste the sweetness as much, but you’ll taste the bitterness just fine.
Something like a donut or chocolate is so sweet, that it overwhelms the taste receptors for sweet, causing your brain to “dial down” their sensitivity, making the beverage taste much less sweet in comparison. It’s like looking into a bright light for a second and being blinded for a little while afterwards.
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