It's strange ... but I believe that the craving greasy foods after drinking has a lot to do with alcohol interfering with dopamine reuptake in the brain. Perhaps the greasy food stimulates the "reward centre" [mesolimbic dopamine system?] and thus causes more dopamine to be released _after_ drunkeness .. re-stimulating cells used to long term potentiation ..

Just a hunch though

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-bm4all-