re asparagus. The whole question of whether eating asparagus causes a particular smell in one's pee is one that fascinates me.
The debate continues as to whether -
a) only a certain percentage of the population digest asparagus in such a way as to produce the characteristic smell
b) only a certain percentage of the population have the particular olfactory sensibility that detects that characteristic smell
Research continues, but it appears that some 22% have the autosomal genes that enable the olfactory detection...
I don't dislike the smell. And, after all, it does feature in À la Recherche* ...
wiki tells us:
"There is debate about whether all (or only some) people produce the smell, and whether all (or only some) people identify the smell. It was originally thought this was because some of the population digested asparagus differently from others, so some people excreted odorous urine after eating asparagus, and others did not. In the 1980s three studies from France, China and Israel published results showing that producing odorous urine from asparagus was a common human characteristic. The Israeli study found that from their 307 subjects all of those who could smell 'asparagus urine' could detect it in the urine of anyone who had eaten asparagus, even if the person who produced it could not detect it himself. However, a 2010 study found variations in both production of odorous urine and the ability to detect the odour, but that these were not tightly related. It is believed most people produce the odorous compounds after eating asparagus, but only about 22% of the population have the autosomal genes required to smell them.
In 2010, the company 23andMe published a genome-wide association study on whether participants have "ever noticed a peculiar odor when you pee after eating asparagus?" This study pinpointed a single-nucleotide polymorphism (SNP) in a cluster of olfactory genes associated with the ability to detect the odor. While this SNP did not explain all of the difference in detection between people, it provides support for the theory that there are genetic differences in olfactory receptors that lead people to be unable to smell these odorous compounds."
* Asparagus "...transforms my chamber-pot into a flask of perfume." Marcel Proust
The debate continues as to whether -
a) only a certain percentage of the population digest asparagus in such a way as to produce the characteristic smell
b) only a certain percentage of the population have the particular olfactory sensibility that detects that characteristic smell
Research continues, but it appears that some 22% have the autosomal genes that enable the olfactory detection...
I don't dislike the smell. And, after all, it does feature in À la Recherche* ...
wiki tells us:
"There is debate about whether all (or only some) people produce the smell, and whether all (or only some) people identify the smell. It was originally thought this was because some of the population digested asparagus differently from others, so some people excreted odorous urine after eating asparagus, and others did not. In the 1980s three studies from France, China and Israel published results showing that producing odorous urine from asparagus was a common human characteristic. The Israeli study found that from their 307 subjects all of those who could smell 'asparagus urine' could detect it in the urine of anyone who had eaten asparagus, even if the person who produced it could not detect it himself. However, a 2010 study found variations in both production of odorous urine and the ability to detect the odour, but that these were not tightly related. It is believed most people produce the odorous compounds after eating asparagus, but only about 22% of the population have the autosomal genes required to smell them.
In 2010, the company 23andMe published a genome-wide association study on whether participants have "ever noticed a peculiar odor when you pee after eating asparagus?" This study pinpointed a single-nucleotide polymorphism (SNP) in a cluster of olfactory genes associated with the ability to detect the odor. While this SNP did not explain all of the difference in detection between people, it provides support for the theory that there are genetic differences in olfactory receptors that lead people to be unable to smell these odorous compounds."
* Asparagus "...transforms my chamber-pot into a flask of perfume." Marcel Proust
Comment