Sugar makes kids hyper.

Scientists have tried and failed several times to find any connection between hyperactivity and sugar. It probably became a belief in 1974 when Dr. William Crook wrote a letter to the American Acadamy of Pediatrics. He said “Only in the past three years have I become aware that sugar… is a leading cause of hyperactivity.

However, according to the National Institute of Mental Health: “The idea that refined sugar causes ADHD or makes symptoms worse is popular, but more research discounts this theory than supports it.”