http://dreamer-easy.livejournal.com/ ([identity profile] dreamer-easy.livejournal.com) wrote in [personal profile] psalm_onethirtyone 2011-06-15 02:48 am (UTC)

IIRC, they get you to drink milk, then measure the amount of hydrogen in your breath, which tells them how much of the lactose you've digested and how much is being digested by your friendly neighbourhood intestinal flora.
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