Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/Cocteautwinzs on 2023-06-27 21:00:06+00:00.

when I drink drink certain diet drinks such as Sprite Zero and fair life protein shakes (that both contain Ace-k) I have a horrible bittersweet aftertaste in my mouth that lasts anywhere from 1-4 hours or until I eat something salty. Is this just a side effect of the sweetener? I only notice I get this taste when I consume something that contains that not real sugar. Thanks in advance:)