Abstract：
BACKGROUND:Pacific oysters along the North American coast from Washington to Alaska contain concentrations of cadmium (Cd) that are high by comparison with Atlantic oysters, frequently exceeding 2mug/g wet weight, but it is unclear whether this Cd is absorbed by consumers. OBJECTIVES:To determine the effect of oyster consumption on Cd in blood and urine among a group with high oyster consumption. METHODS:Sixty-one non-smoking oyster growers and family members with a mean age of 47.3+/-7.6 years (range 33-64) were interviewed by telephone to assess their oyster consumption and other sources of Cd exposure at present and 5 years prior to the start of oyster farming. Their blood and urine Cd concentrations were measured. RESULTS:The geometric mean Cd concentration in blood was 0.83mug/L and in urine was 0.76mug/g creatinine. Thirty-six percent of participants had urinary Cd levels above 1mug/g creatinine and 5% were above 2mug/g creatinine. Recent (last 12 months) and long-term oyster consumptions were positive predictors of blood Cd but did not directly predict urinary Cd. The optimal model for predicting the variance in blood Cd included recent intake of oyster-derived Cd, serum iron concentration and recent ketchup consumption (R(2)=0.34, p=0.00004), with the latter two variables showing a protective effect. The factors found to predict urinary Cd were blood Cd concentration and duration of oyster farming. A rise in blood Cd was observed after 12 years of farming oysters, likely caused by higher consumption of oysters during this period. CONCLUSIONS:Oyster-derived Cd is bioavailable and affects body stores of the metal.
journal_name
Environ Resjournal_title
Environmental researchauthors
Copes R,Clark NA,Rideout K,Palaty J,Teschke Kdoi
10.1016/j.envres.2008.01.014subject
Has Abstractpub_date
2008-06-01 00:00:00pages
160-9issue
2eissn
0013-9351issn
1096-0953pii
S0013-9351(08)00029-7journal_volume
107pub_type
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