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One of those was published in May in the American Journal of Epidemiology. Researchers asked 341 pregnant women in Massachusetts about their diet and tested their blood mercury levels during the second trimester. Then, when their children were 3, they were tested in a range of thinking and movement tasks.
Children of mothers who ate more than two servings of fish per week had higher scores than kids of non-fish-eating moms, even when other influences of early childhood development, such as birth weight and breast-feeding duration, were factored out. No measurable benefit was seen in kids born to women who ate fewer than two servings of fish per week, which corresponds to the current FDA/EPA advice.
The improvements in kids were even more striking in kids of moms with lower mercury levels, suggesting that choosing low-mercury fish is key. Researchers did ask about broad categories of fish, but, Oken says, it’s a big uncertainty in this kind of research. “We don’t really know a lot of detail about the kind of fish that women are eating.”
On the flip side, children of mothers with the highest mercury levels in their blood scored poorly, and if their moms ate less fish, the detriments were greater.
In short, Oken was able to demonstrate both the benefits of fish eating and the risks of mercury intake. When both fish and mercury are taken together, Oken’s study suggests that the good may outweigh the bad, at least in the fish-eating habits of her subjects.
Sources: The Times Of India