Why do asparagus

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Asparagusic acid General effects on urine odor Varying effects Bottom line You may have noticed that after eating asparagus, your pee has a somewhat unpleasant scent. Share on Pinterest. How does it affect urine smell? The bottom line. This happened to coincide with the British agrarian revolution when fertilisers containing sulphur were first used on crops, although there is no real evidence to say if this effect is causal. There have been different theories put forward over the years explaining why only some people notice a smell in their urine after eating asparagus.

It was first thought that some people broke down the vegetable in a way that released a smelly chemical in the urine.

This led to a theory that the characteristic was carried by a dominant gene that only needed to be inherited from one parent. This suggested that any asparagus compound responsible for the smell could pass through the placenta and be converted to the smelly compound by the foetus that inherited the gene from their father.

The problem with the idea of a genetic ability to produce smelly urine is that there is not just one compound that always appears in urine after eating asparagus. Up to 29 different compounds from the vegetable are potential odourants, although methanethiol or methyl—mercaptin is the most predominant. When looking at possible genetic causes, the researchers not find any particular genes associated with production of odorants. They did however, find that the ability to detect the smell was linked to a specific DNA sequence that varied between different people.

This means a single molecule change in the genes responsible for smell may be linked to the inability to smell asparagus odour in urine. When you pee, the sulfur byproducts evaporate almost immediately, causing you to smell that unpleasant scent. Other foods and drinks have been known to cause smelly urine.

For example, some people report that drinking too much coffee causes their urine to smell like coffee. Brussels sprouts, onions and garlic have also been linked to odd smelling pee in some people. Asparagus pee usually shows up between 15 and 30 minutes after eating the vegetable and can last for several hours. One study found that the smell could last for up to 14 hours! Asparagus urine odor has been observed for centuries. So before you start wondering if something is wrong with you, rest assured asparagus pee is a totally normal bodily reaction.

Everyone metabolizes food compounds differently.