Why Asparagus Makes Your Pee Stink

"This is of no practical importance," the urologist tells me. "It wasn't part of my training. It's something we contemplated over pizza and beer." When I admit that I have actually timed the arrival of the distinctive odor in my pee after eating asparagus (about 15 minutes), the good doctor suggests, facetiously, that my groundbreaking research might lead to a tenure-track position at a fine university.

It is a sadly neglected field. But I'm not the first to ask.
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  thanks to Everlasting Blort