Attention deficit hyperactivity disorder (ADHD) is a complex condition that is difficult to treat. It is estimated that between 3% and 5% of children in the United States have ADHD, which is associated with other conditions including oppositional defiant disorder and conduct disorder. Although stimulant medications are often prescribed to treat symptoms of ADHD, they are not always effective and can lead to side effects such as weight loss or sleep problems. However, research shows that a healthy gut may play an important role in reducing ADHD symptoms — and eating healthy foods can help restore balance to your child’s microbiome.