Notes: ND: not detectable. Data from U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Seafood (May 2001).

Source: Adapted from Counter, S.A. and Buchanan, L.H., Toxicol. Appl. Pharmacol., 198, 209, 2004.

In the U.S., 41 states have issued advisories on limiting fish intake, especially for pregnant women and women who may become pregnant [177]. It may be noted that methyl mercury exposure during fetal development and breast feeding is strongly related to the maternal Hg burden [178]. Maternal constitution factors that affect Hg secretion into breast milk are maternal age and lactation stage [179].

Mercury concentration in food crops is generally low, with most of the dietary intake of Hg deriving from consumption of seafood. Exposure of mercury through food items other than fish contaminated with methyl mercury is much less via trophic transfer. Concentration of mercury in most other food items in the average human diet is below the detection limit (20 |g/kg fresh weight) [180,181]. Levels of Hg in most field crops are sufficiently low to cause any concern from the human health viewpoint [182]. This is because mercury is strongly sorbed to soil constituents and as Hg2+ or hydrolyzed species is rather immobile in soils [159]. Mercury poisoning on account of consumption of agricultural crops reported in Iraq was due to the consumption of seeds treated with mercury fungicides and not trophic transfer [183].

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100 Pregnancy Tips

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