What is one of the changes in the GI system associated with aging?

As individuals age, one notable change in the gastrointestinal (GI) system is slower peristalsis. Peristalsis refers to the series of wave-like muscle contractions that move food through the digestive tract. With age, the muscle tone and contractions of the GI tract may become less efficient. This can lead to a slower rate of movement of food and waste through the digestive system, potentially contributing to issues such as constipation or bloating.

In contrast, the other options highlight aspects of GI function that typically do not improve or may not be positively affected by aging. For example, the sense of smell tends to decline with age, and digestion may not become more efficient; rather, it may become less efficient due to decreased enzyme production or altered gut microbiota. Additionally, while some individuals experience changes in saliva production with age, an increase is not commonly associated with the aging process; instead, decreased saliva production is often more prevalent, which can impact swallowing and digestion.