Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
The single-celled protozoan Toxoplasma gondii is a fascinating parasite. Replicating only in cat intestines, it is excreted in feces and subsequently spreads to many other organisms, not just felines. Inside these critters, it winds its way to the brain and transforms into numerous cysts, patiently waiting to return to its desired nine-lived host. But, though dormant, it is not entirely inert. T. gondii actually alters its host's behavior. Mice, for example, grow less fearful of cats, making them easier prey. Just like T. gondii wanted...
Curiously, as as new study published in PeerJ finds, T. gondii may also change humans' physical appearance. An international team turned up a link between a latent infection and facial attractiveness. The researchers recruited 213 healthy college students at the National Autonomous University of Mexico, all of whom had previously been tested for T. gondii. Thirty-five subjects (22 men and 13 women) had the parasite, while 178 (86 men and 92 women) did not. The researchers then asked the subjects various questions and took pictures of their faces.
Next, another 205 participants each viewed a random collection of twenty of these pictures, ten of Toxoplasma-positive subjects and ten of Toxoplasma-negative subjects, rating each pictured participant for facial attractiveness and perceived health on a 10-point scale. (Raters were not told of participants' Toxoplasma status.) Overall, raters judged Toxoplasma-positive subjects to be significantly more attractive and healthy-looking than Toxoplasma-negative subjects.
The single-celled protozoan Toxoplasma gondii is a fascinating parasite. Replicating only in cat intestines, it is excreted in feces and subsequently spreads to many other organisms, not just felines. Inside these critters, it winds its way to the brain and transforms into numerous cysts, patiently waiting to return to its desired nine-lived host. But, though dormant, it is not entirely inert. T. gondii actually alters its host's behavior. Mice, for example, grow less fearful of cats, making them easier prey. Just like T. gondii wanted...
Curiously, as as new study published in PeerJ finds, T. gondii may also change humans' physical appearance. An international team turned up a link between a latent infection and facial attractiveness. The researchers recruited 213 healthy college students at the National Autonomous University of Mexico, all of whom had previously been tested for T. gondii. Thirty-five subjects (22 men and 13 women) had the parasite, while 178 (86 men and 92 women) did not. The researchers then asked the subjects various questions and took pictures of their faces.
Next, another 205 participants each viewed a random collection of twenty of these pictures, ten of Toxoplasma-positive subjects and ten of Toxoplasma-negative subjects, rating each pictured participant for facial attractiveness and perceived health on a 10-point scale. (Raters were not told of participants' Toxoplasma status.) Overall, raters judged Toxoplasma-positive subjects to be significantly more attractive and healthy-looking than Toxoplasma-negative subjects.
That does sound very strange, however it is not without precedent in nature. A semi-related phenomenon is parasitic wasps (or even spores), and how they turn their host into a zombie and/or willing sacrifice;
That does sound very strange, however it is not without precedent in nature. A semi-related phenomenon is parasitic wasps (or even spores), and how they turn their host into a zombie and/or willing sacrifice;
yeah, i've heard of those two, which are crazy enough. but to me this is on a whole 'nother level:
Quote:
Results
First, we found that infected men had lower facial fluctuating asymmetry whereas infected women had lower body mass, lower body mass index, a tendency for lower facial fluctuating asymmetry, higher self-perceived attractiveness, and a higher number of sexual partners than non-infected ones. Then, we found that infected men and women were rated as more attractive and healthier than non-infected ones.
Conclusions
Our results suggest that some sexually transmitted parasites, such as T. gondii, may produce changes in the appearance and behavior of the human host, either as a by-product of the infection or as the result of the manipulation of the parasite to increase its spread to new hosts. Taken together, these results lay the foundation for future research on the manipulation of the human host by sexually transmitted pathogens and parasites.
I believe this is also thought to be al least partially responsible for the crazy, cat lady syndrome.
I didn't think crazy cat ladies were considered attractive. In general. Hmmm....
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.
Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
