In Mary Roach's book "Gulp: Adventures on the Alimentary Canal," the author explores various aspects of the digestive system with a mix of humor and insight. One intriguing detail highlighted is the impact of constipation on Elvis Presley, suggesting that it plagued his daily life. Roach creatively connects this personal struggle to Presley's renowned motto, TCB, or "Taking Care of Business," implying a humorous link to his bathroom habits.

This connection reflects the often-overlooked challenges of health issues that can significantly influence a person's lifestyle, even affecting the iconic image of a celebrity like Presley. Roach's writing encourages readers to consider the quirks and realities of human biology in an engaging manner, emphasizing that even larger-than-life figures deal with common, relatable problems.