Sour Makes You Thristy

I wonder why sour treats make me thirsty?  I assume that this is the same for others as well.  Is it just the want to eliminate the sour taste from our mouths, or is there something more to this?  My random, non-researched, guess is that is has something to do with humans natural instinct to get poisonous foods out of our mouth.  Many poisonous foods are sour, so we as humans develop an instinct to wash these foods out of our mouth, thus we are thirsty... Isn't evolution fun?

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