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Tom Hale on breastmilk toxins`
As quoted on LactNet:
"There is great interest presently in the new data just being published concerning the transfer of polybrominated diphenyl ether flame retardants. This family of chemicals is commonly used in soft foam pads, and many many plastics used in the computer industry. The paper is being published by Arnold Schecter MD, MPH for The UT Health Sciences Center Dallas Texas. Basically this paper shows that in a small population of central Texas women, that levels of Polybrominated diphenyl products were present in milk. If you look at the distribution curve, the vast majority of women were less than 50 ng/g lipid, and only a few 13 of 47 were about this amount. These products have been around for over 30 years, but due to their ability to bioaccumulate in fat tissues in humans, and some reported neurobehavioral abnormalities in mice and rats, we are becoming more interested in this groups of compounds. This paper suggests that the levels in this Texas subgroup were much higher than in Europe where these compounds are banned. While it is concerning that they are present in Americans, the data with the rat and mice studies were as you would expect done using extraordinarily high levels. All of the abnormalities occured in the first trimester in utero, not while breastfeeding or afterward. Secondly the dose was acute, and ranged from 3 to 20 mg/kg. These studies don't necessarily correlate with what occurs in humans at all (that is slow accumulation). The 50th percentile concentration in human milk was 34 nanograms/gram of lipid in milk. If an infant ingested 150 cc/kg/day, and the milk contained an average of 5% fat...then the infant would ingest about 255 nanograms of PBB per day. This is 1/78,000 that the poor rats received. These levels are so extraordinarily low that I can't imagine they would cause untoward effects in an infant. Some have suggested that the high levels of polyunsaturated oils (arachidonic and docosohexenoic acids) would more than counteract any problems with these low levels of PBBs. Nevertheless, this study does suggest why all of us should support better environmental controls of these bioaccumulative compounds, such as the PCBs and PBBs. For those of us who support breastfeeding, environmental pollution is a major risk for future generations of breastfeeding babies." -Tom Hale, Ph.D. -- iphigenia www.tristyn.net "i have heard the mermaids singing, each to each. i do not think that they will sing to me." |
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