lördag 7 april 2012

Testosteron mannens nyckel till....

Detta hormon bildas i testiklarna och nu skönjer vi förändringar i produktionen. Vad de kan bero på är som baken, smaken är delad. Vi kan i varje fall vara överens om att dessa hormoner är viktiga för att killar skall behålla sin manlighet och producera sädesceller.

Läkare och forskare pratar om att olika sjukdomar och kroniska sjukdomstillstånd kan påverka hormonproduktionen. Men eftersom det verkar vara ett globalt problem så borde man även gå in och titta på vår jordbrukspolitik, vilka gödningsmedel och bekämpningsmedel som använts. Vad stoppar djurhållarna i kossorna, grisarna, hönorna och fåren. 

For instance, 90 percent of American men have evidence of chlorpyrifos in their urine. This shouldn’t be surprising, since up to 19 million pounds of the stuff was distributed across the United States in 1999 alone, much of it in household products like tick-and-flea powder for pets, lawn treatments, and common insecticides. Though residential use is now restricted, chlorpyrifos is still common in agriculture, as well as in some professional applications; for most people, diet is now the main source of exposure. In a recent Harvard study, men with the highest chlorpyrifos exposure typically had 20 percent less testosterone than those with the lowest exposure.
Carbaryl is another possible culprit. Detectable levels turn up in 75 percent of American men, and having it in your urine appears to be associated with reduced sperm count and liveliness, or motility, as well as increased DNA damage. And yet we still apply carbaryl to lawns and gardens at a rate of up to 4 million pounds a year, mostly by way of an insecticide known as Sevin. There should be a bumper sticker: Honey, the lawn shrunk my testicles.
Phthalates are also everywhere, almost certainly including your own body. Manufacturers use them in colognes and cosmetics and as softeners in plastics. Baby bottles now come “phthalate-free,” but hospital intravenous bags generally don’t. And yet some phthalates seem to have all of carbaryl’s unpleasant associations with reproductive health. And not just in men: Last year Greenpeace issued a warning against the danger of phthalates in your girlfriend’s sex toys. Then the Danish Environmental Protection Agency came riding to the rescue, declaring such toys safe—as long as she keeps it to an hour or less a day.
Scientists can’t say that any of the suspect chemicals actually cause the reproductive effects that are occurring. They can only point out troubling associations. But these associations seem to be proliferating. About 50 new chemicals come onto the market weekly, says Dr. Harman, and while testing for carcinogenicity is required, “there’s no systematized testing for subtle endocrine effects.”
We’re not likely to have good answers anytime soon. The reproductive problems of human males will remain understudied, says Dr. Harman, in part because federal research dollars are being diverted to issues like biological warfare and terrorism. “We might just wind up disappearing from the planet quietly,” he says, “because we were too busy fighting wars to figure out that our reproductive systems were going south.”

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