A sizable (3-10%) part of the population can either not digest lactose or has a significantly reduced ability to absorb fructose in the gut. The resulting fermentation and low dosing of low quality alcohol can cause cognitive symptoms which can be totally alleviated by appropriate diet.

It is easy to test (drink a sugar challenge drink and measure H2 in breath) but as it is time consuming and not profitable rarely done.

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taneq 2 days ago | parent [-]

Are you conflating lactose intolerance with autobrewery syndrome? O.o

	▲	seec a day ago \| parent [-]
		I find the "autobrewery" term hilarious and great. Imagine being able to be constantly buzzed just by eating some random fruits. it almost seems too good to be true. In all seriousness I'm sure that people suffering from it don't appreciate it that much, but at first glance it seems like a positive problem to have!