"Too much caffeine causes a jittery feeling," says Dr. Ashlie Olp, lead physician at Olp Family Medicine of Carmel, IN, to POPSUGAR. "Caffeine stimulates both the central nervous system [CNS] and ...

Ashlie D. Stevens is Salon's food editor. She is also an award-winning radio producer, editor and features writer — with a special emphasis on food, culture and subculture. Her writing has ...