According to the Centers for Disease Control and Prevention (CDC), in 2008, 1 in 88 children has been identified with an autism spectrum disorder (ASD). A recent 2011-12 national survey of parents reported levels of 1 in 50 US children. For unknown reasons, the prevalence of ASD increases ever year. There seems to be a public concern that mercury and autism are linked.
The journal Epidemiology found that mercury in fish does not appear to contribute to autism, which support other research published in the last few years. The FDA still recommends that pregnant women limit their intake of fish, especially fish high in mercury. However, research has been unable to find an association between mercury and autism.