A Swedish study suggests that children are twice as likely to show signs of attention-deficit hyperactivity disorder (ADHD) if their mothers were overweight or obese when they became pregnant. The researchers also found that the children were more likely to express negative emotions such as fear and sadness when compared to those whose mothers were a normal weight when they became pregnant. The study's authors did not prove a causal relationship between obesity in mothers and ADHD, but they theorize that metabolic factors during pregnancy may be responsible for the link.
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