Physical and Cognitive Development in Early and Middle Childhood

One of the major developmental disorders that we often hear about is attention deficit hyperactivity disorder (ADHD). There have been several hypotheses tested in search of a cause of ADHD. Factors that have been considered include food, food additives,  and food colorants. Is the diet of today's children really creating issues like ADHD, or is something else behind the rapid rise in the number of children being diagnosed with it? What can you offer to back up your position?