FGF19 is a protein that plays a crucial role in regulating various metabolic processes in the body. It is part of the fibroblast growth factor family and is primarily produced in the intestine after eating. FGF19 helps control bile acid synthesis and glucose metabolism, contributing to overall energy balance. Research has shown that FGF19 can influence liver function and may have implications for conditions like obesity and diabetes. By signaling to the liver and other organs, FGF19 helps maintain metabolic homeostasis, making it an important focus for studies related to metabolic diseases.