Caffeine: How Our Favorite Stimulant Helps and Hurts Us

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 (Jenny Oh/KQED)

Coffee. Some days your morning cup leaves you jittery and overly chatty, and other days you can barely lift your head off your keyboard. Turns out that coffee, like so many caffeinated items, is unpredictable and unregulated -- the amount of caffeine in a cup of the same brand, made the same way, can vary wildly. Journalist Murray Carpenter has traveled to South America and China, interviewing consumers, scientists, regulators and industry representatives to get the full story on caffeine. He joins us to talk about his new book, "Caffeinated: How Our Daily Habit Helps, Hurts, and Hooks Us."


Murray Carpenter, journalist and author of "Caffeinated: How Our Daily Habit Helps, Hurts, and Hooks Us"