Gastrointestinal physiology is the study of the function and regulation of the digestive system, which includes the stomach, intestines, liver, and pancreas. This field of research focuses on understanding how food is broken down, absorbed, and processed by the body to provide energy and essential nutrients. Gastrointestinal physiology also investigates how the digestive system interacts with other body systems, such as the endocrine and nervous systems, to maintain homeostasis and respond to changes in diet or environmental conditions. Researchers in this area may study topics such as nutrient absorption, gut motility, digestive enzymes, and the role of the microbiome in digestion and overall health.