Murray Carpenter, author of “Caffeinated: How our Daily Habit Helps, Hurts, and Hooks Us” reveals the little-known truth about this addictive, largely unregulated drug found in coffee, energy drinks, teas, colas, chocolate, and even pain relievers. Psychiatrist Dr. Himal Mitra joins us as well to explain the effect of other kinds of stimulants (including ADHD medication), on the body.