"Beer before liquor, never sicker, liquor before beer, never fear"

Is the saying "Beer before liquor, never sicker, liquor before beer, never fear" physiologically accurate?

The reasoning behind the proverb is that it's easier on your body to absorb weaker alcoholic drinks, like beer, later in the evening. This probably holds some merit. It's also true that your body tends to process alcohol from carbonated drinks faster. But any piece of advice regarding alcohol consumption that contains the line "never fear" is obviously pretty suspect.

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