black7
Vet
- Joined
- Feb 13, 2007
- Messages
- 4,278

This might be kind of a weird post today. Have you ever noticed that when you eat asparagus your urine smells awful?
The reason for the smell is a sulfer compound called mercaptan. This compound is also found in rotten eggs, onion, garlic, and the secretions of skunks. When you eat asparagus, your digestive tract breaks down the mercaptan and the resulting by-products cause the smell. It happens quickly, and you may even be able to notice the smell as early as 15 minutes after eating it! Mercaptan and the resulting odor is not harmful in any way.
What is fascinating, though, is that not everyone has the gene to break down the mercaptan, so some people have no idea what you are talking about when you say your pee smells funny after eating asparagus! The studies vary, but it seems that certain ethnic populations have it more than others. This has not been highly studied, but studies have been done on small groups of British, French, and Israeli Jews. It seems that all of the French had it and only about half of the Britains produced the odor. The Israeli Jews were also mixed, but some of them who did produce the odor could not smell it. Interesting?..
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