Santa Maria -- A new study finds a link between a mother's diet and her child's chance of having ADHD. The study, published online in the Archives of Pediatrics & Adolescent Medicine, looked at 400 children and found an increased risk of the behaviors associated with Attention Deficit Hyperactivity Disorder in kids whose mothers had higher mercury levels. Researchers also found mothers who ate more than two servings of fish per week helped reduce the risk of ADHD in their children.