Researchers found that eating fish during pregnancy was positively associated with enhanced fetal brain development.
It was observed that the more fish the pregnant women ate during the second trimester, the better her six month old performed on a standard mental test.
The test showed that mothers who ate fish raised the baby's score by four points for each weekly serving of fish.
However, the boost of mental capacity did not happen to those mothers who ate the wrong fish. Fish containing high levels of mercury counteract the positive effect of fish and their babies tended to have relatively lower test scores.
The scores for those babies whose mothers ate the mercy-loaded fish went down as the mercury level went up. An increase of one part per million in mercury was associated with a decrement in the mental score of 7.5 points.
The mental scores were highest among infants of women who consumed more than two weekly fish servings but had mercury levels at less than 1.2 parts per million.
Because of this, researchers cautioned that pregnant women should avoid mercury-loaded fish such as those large and long lived fish, which tend to accumulate high levels of mercury and other pollutants.
I found these recent studies to be interesting for a couple of reasons. First, the obvious reason being that mercury is a common topic on my blog, particularly as it relates to the numerous posts about mercury and it's highly plausible association to autism. ( Autism - If not mercury, then what? )