A new study conducted by researchers at the Brigham and Women’s Hospital concludes that prenatal mercury exposure is linked to ADHD (Attention Deficit Hyperactivity Disorder) in children. According to senior study author Dr. Susan Korrick, “A hair-mercury level in the mother of about 1 part per million (ppm) or more was associated with a 60% increased risk of ADHD-related behavior.” Oddly, the same fish that carry mercury may also counteract this effect. Read on to learn why.