In "Gulp: Adventures on the Alimentary Canal," Mary Roach discusses the challenges posed by the structure of ear cartilage, which has limited blood supply. This lack of vascular support can hinder healing and complicate injuries, making it essential to properly care for wounds in that area. Roach humorously suggests that anyone considering a confrontation with a boxer like Mike Tyson should be particularly mindful of their ear care.

Roach's commentary reflects the broader theme of her book, where she explores the complexities of the human digestive system and related anatomical features. The insight about ear cartilage serves to remind readers of the body's quirks and the importance of medical attention in certain situations, especially when facing potential physical altercations.