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we are all contaminated - Sistema de Bibliotecas de la Universidad ...

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and cognitive dysfunction, with low-level lead exposure, with dysfunctions occurring even<br />

years after the end of occupational exposure (Schafer et al 2005). The <strong>de</strong>velopment of<br />

cataracts have also been linked to earlier lifelong lead exposure. Lead is a proven animal<br />

carcinogen, and has been <strong>de</strong>cl<strong>are</strong>d as “possibly carcinogenic to humans” by the International<br />

Agency for Research on Cancer. In 2005, the U.S. Department of Health and Human Services<br />

ad<strong>de</strong>d lead for the first time to its list of cancer-causing agents, <strong>de</strong>signating it to the secondtier<br />

status of “Reasonably Anticipated Carcinogens” (Kay 2005).<br />

Hernberg notes the “strange assumption” that “industrial workers <strong>we</strong>re a special race<br />

or species” and could withstand higher levels of lead than the general popu<strong>la</strong>tion (Hernberg<br />

2000: 248). Researchers working through the Normative Aging Study have revealed that<br />

even mo<strong>de</strong>rate levels of early lead exposure <strong>are</strong> associated with an increased risk of phobic<br />

anxiety and other psychiatric symptoms in middle-aged to el<strong>de</strong>rly men (Rho<strong>de</strong>s et al 2003).<br />

Tsiah et al (2004: 1173), working with a subset of the same study, conclu<strong>de</strong> that “longitudinal<br />

<strong>de</strong>cline of renal function among middle-age and el<strong>de</strong>rly individuals appears to <strong>de</strong>pend on both<br />

long-term and circu<strong>la</strong>ting lead, with an effect that is most pronounced among diabetics and<br />

hypertensives, subjects who likely represent particu<strong>la</strong>rly susceptible groups.” Another study<br />

on el<strong>de</strong>rly workers suggests a link bet<strong>we</strong>en lead and elevated uric acid levels, and<br />

subsequently lead-re<strong>la</strong>ted nephrotoxicity (Weaver et al 2005), while adult cognitive function<br />

<strong>de</strong>cline and <strong>de</strong>mentia have been linked to early exposure among tetraethyl lead (TEL) workers<br />

(Schwartz et al 2000).<br />

In a study on adult women, Gulson et al (2004) report a significant increase in BLLs<br />

during <strong>la</strong>te pregnancy and postpartum, when skeleton lead is mobilized. Their study shows<br />

that even taking calcium supplements provi<strong>de</strong>s only limited relief from lead exposure. The<br />

34

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