<P> It has been claimed that Tamoxifen and some phthalates have fundamentally different (and harmful) effects on the body at low doses than at high doses . </P> <P> Food is a major mechanism by which people are exposed to pollutants . Diet is thought to account for up to 90% of a person's PCB and DDT body burden . In a study of 32 different common food products from three grocery stores in Dallas, fish and other animal products were found to be contaminated with PBDE . Since these compounds are fat soluble, it is likely they are accumulating from the environment in the fatty tissue of animals we eat . Some suspect fish consumption is a major source of many environmental contaminants . Indeed, both wild and farmed salmon from all over the world have been shown to contain a variety of man - made organic compounds . </P> <P> With the increase in household products containing pollutants and the decrease in the quality of building ventilation, indoor air has become a significant source of pollutant exposure . Residents living in homes with wood floors treated in the 1960s with PCB - based wood finish have a much higher body burden than the general population . A study of indoor house dust and dryer lint of 16 homes found high levels of all 22 different PBDE congeners tested for in all samples . Recent studies suggest that contaminated house dust, not food, may be the major source of PBDE in our bodies . One study estimated that ingestion of house dust accounts for up to 82% of our PBDE body burden . </P> <P> Research conducted by the Environmental Working Group found that 19 out of 20 children tested had levels of PBDE in their blood 3.5 times higher than the amount in their mothers' blood . It has been shown that contaminated house dust is a primary source of lead in young children's bodies . It may be that babies and toddlers ingest more contaminated house dust than the adults they live with, and therefore have much higher levels of pollutants in their systems . </P>

How does bisphenol a (bpa) act as an endocrine disruptor