GLUT stands for "glucose transporter," which is a type of protein that helps move glucose, a simple sugar, into cells. Glucose is essential for energy production in the body, and GLUT proteins play a crucial role in regulating blood sugar levels. There are several types of GLUT proteins, each with specific functions and locations in the body. The most well-known GLUT protein is GLUT4, which is primarily found in muscle and fat tissues. When insulin is released after eating, it signals cells to increase the uptake of glucose through GLUT4. This process helps maintain stable blood sugar levels and provides energy for physical activities.