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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown

Asparagus odour in urine

There are two as yet unexplained enigmas regarding the unusual odour of the urine of those who have recently eaten asparagus.

1) The odour-causing molecules have not been unequivocally identified.
2) Some individuals cannot smell the odour at all.

Reference: Excretion and Perception of a Characteristic Odor in Urine after Asparagus Ingestion: a Psychophysical and Genetic Study (Chem. Senses (2010) doi: 10.1093/chemse/bjq081 )

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