(1 min) Transcript. Dr Greger's summary: "Are soda-drinking teens more hyperactive because of the sugar, caffeine, or preservatives?"

(5 mins) Transcript. Dr Greger's summary: "In response to definitive evidence showing artificial colors may increase inattentiveness, impulsivity, and hyperactivity among young children, a call has been made by consumer groups to ban food dyes."

(2 mins) Transcript. Dr Greger's summary: "Exercise has been shown to be effective in controlling attention deficit and hyperactivity disorder symptoms, and carries only positive side effects."