In her book "Gulp: Adventures on the Alimentary Canal," Mary Roach explores the fascinating journey of food through the human digestive system. She delves into the complexities of consumption, digestion, and the various reactions our bodies have to food. Through engaging anecdotes and scientific insights, Roach makes the topic both entertaining and informative.

One interesting detail she highlights is the scientific term for the common behavior of licking lips, referred to as "lateral tongue protrusion." This term reflects the intricate ways our bodies prepare for and respond to the act of eating, showcasing the deeper connections between human behaviors and the physiological processes involved in digestion.