02-01-2009, 05:53 AM
Sunday, February 01, 2009
ISLAMABAD: Chemicals commonly found in food packaging, upholstery and carpets may be damaging women’s fertility, say US scientists.
A study published in the journal Human Reproduction measured levels of perfluorinated chemicals (PFCs) in the blood of 1,240 women. Those with higher levels were more likely to take longer to become pregnant. UK experts said more research was needed to confirm a link.
PFCs are useful in industry because they are resistant to heat, and have the ability to repel water and oil.
However, high concentrations have been linked to organ damage in animals, and the chemicals have the ability to persist for long periods in the body. The researchers, from the University of California in Los Angeles, analysed blood samples taken at the time of the woman’s first antenatal visit, then interviewed the women about whether the pregnancy was planned, and how long it had taken them to get pregnant.
The levels of the chemicals varied from 6.4 nanograms per millilitre of blood - a nanogram is a billionth of a gram - to 106.4 nanograms per ml.
When the group of women were divided into four groups depending on these levels, they found that, compared to women in the group with the lowest readings, the likelihood of infertility - taking more than a year or IVF to get pregnant - was significantly higher for women with higher levels of PFCs in their bloodstream. Dr Chunyuan Fei, one of the researchers, said that earlier studies had suggested that PFCs might impair the growth of babies in the womb. She said that more women in the groups with higher exposure to PFCs had problems with irregular menstrual cycles , which might suggest that interference with hormones was the reason.
Professor Jorn Olsen, who led the study, said that the team were now waiting for further studies to confirm the link between fertility problems and PFCs. Tony Rutherford, chairman of the British Fertility Society, said that the findings were “interesting”.
“This research shows a tenuous link in the delay to conception in women with the highest levels of two commonly-used perfluorinated chemicals.
“It is an important finding and certainly warrants further detailed research, particularly in those trying for a family.
“The study emphasises the importance of remaining vigilant to potential environmental factors that may impact on fertility.”
Gut worm may help treat asthma: The humble worm could hold the key to wiping out asthma and other conditions which are on the rise due to the modern mania with cleanliness, reckon scientists.
Researchers in Nottingham are currently investigating whether giving hook worms to asthma sufferers can cure their condition. In developed countries, the worms have been eliminated from humans, because of an increased emphasis on hygiene, reports the Telegraph.However, experts believe their absence could be one of the reasons why some illnesses, including asthma and diabetes, are increasingly prevalent.
Now, a trial by scientists at Nottingham University is testing whether infecting asthma sufferers with hookworms can ease their symptoms.
Besides UK boffins, American researchers are also attempting to replicate the results of an Argentinian study which showed that infecting multiple sclerosis sufferers with parasites slowed the progression of the condition.
If successful, researchers hope that pharmaceutical companies could develop drugs which have the same positive effect on the immune system as worms.
Professor Jan Bradley, an expert in parasite immunology from Nottingham University, said that our immune systems could be ìout of balanceî because of a lack of the parasites.
‘It’s not inconceivable that for certain bowel conditions you might take it in your drink,î she said.
http://www.thenews.com.pk/daily_detail.asp?id=160230
ISLAMABAD: Chemicals commonly found in food packaging, upholstery and carpets may be damaging women’s fertility, say US scientists.
A study published in the journal Human Reproduction measured levels of perfluorinated chemicals (PFCs) in the blood of 1,240 women. Those with higher levels were more likely to take longer to become pregnant. UK experts said more research was needed to confirm a link.
PFCs are useful in industry because they are resistant to heat, and have the ability to repel water and oil.
However, high concentrations have been linked to organ damage in animals, and the chemicals have the ability to persist for long periods in the body. The researchers, from the University of California in Los Angeles, analysed blood samples taken at the time of the woman’s first antenatal visit, then interviewed the women about whether the pregnancy was planned, and how long it had taken them to get pregnant.
The levels of the chemicals varied from 6.4 nanograms per millilitre of blood - a nanogram is a billionth of a gram - to 106.4 nanograms per ml.
When the group of women were divided into four groups depending on these levels, they found that, compared to women in the group with the lowest readings, the likelihood of infertility - taking more than a year or IVF to get pregnant - was significantly higher for women with higher levels of PFCs in their bloodstream. Dr Chunyuan Fei, one of the researchers, said that earlier studies had suggested that PFCs might impair the growth of babies in the womb. She said that more women in the groups with higher exposure to PFCs had problems with irregular menstrual cycles , which might suggest that interference with hormones was the reason.
Professor Jorn Olsen, who led the study, said that the team were now waiting for further studies to confirm the link between fertility problems and PFCs. Tony Rutherford, chairman of the British Fertility Society, said that the findings were “interesting”.
“This research shows a tenuous link in the delay to conception in women with the highest levels of two commonly-used perfluorinated chemicals.
“It is an important finding and certainly warrants further detailed research, particularly in those trying for a family.
“The study emphasises the importance of remaining vigilant to potential environmental factors that may impact on fertility.”
Gut worm may help treat asthma: The humble worm could hold the key to wiping out asthma and other conditions which are on the rise due to the modern mania with cleanliness, reckon scientists.
Researchers in Nottingham are currently investigating whether giving hook worms to asthma sufferers can cure their condition. In developed countries, the worms have been eliminated from humans, because of an increased emphasis on hygiene, reports the Telegraph.However, experts believe their absence could be one of the reasons why some illnesses, including asthma and diabetes, are increasingly prevalent.
Now, a trial by scientists at Nottingham University is testing whether infecting asthma sufferers with hookworms can ease their symptoms.
Besides UK boffins, American researchers are also attempting to replicate the results of an Argentinian study which showed that infecting multiple sclerosis sufferers with parasites slowed the progression of the condition.
If successful, researchers hope that pharmaceutical companies could develop drugs which have the same positive effect on the immune system as worms.
Professor Jan Bradley, an expert in parasite immunology from Nottingham University, said that our immune systems could be ìout of balanceî because of a lack of the parasites.
‘It’s not inconceivable that for certain bowel conditions you might take it in your drink,î she said.
http://www.thenews.com.pk/daily_detail.asp?id=160230