ADHD symptoms were noted when the children were 8 years old . And even if they did , there 's no reliable way to estimate which fish are high in mercury and which are n't . Comment: Fish consumption is not independently related to ADHD symptoms . Shark , swordfish and tuna are more likely to contain high levels of mercury .
ADHD symptoms were noted when the children were 8 years old . Comment: Fish consumption is not independently related to ADHD symptoms . Shark , swordfish and tuna are more likely to contain high levels of mercury .