GLUT5, or glucose transporter type 5, is a protein that primarily facilitates the transport of fructose across cell membranes. It is mainly found in the intestines, kidneys, and certain tissues in the brain. GLUT5 plays a crucial role in the absorption of fructose from the diet, allowing cells to utilize this sugar for energy. Unlike other glucose transporters, GLUT5 does not transport glucose effectively. Instead, it is specific for fructose, which is a simple sugar found in fruits and honey. Understanding GLUT5 is important for studying metabolic processes and conditions related to sugar metabolism and diabetes.