Attention Deficit Hyperactivity Disorder (ADHD) - Glossary Psychiatrist - A Medical doctor who treats mental illnesses Psychologists - A mental health specialist who is not a medical doctor Neurologist - A doctor who treats illnesses related to the brain and the nervous system Paediatrician - A doctor who treats children Food additives - Agents that are added to food to enhance its color, flavor or taste Published on Feb 06, 2016Last Updated on Mar 30, 2018