Glucagon plays a crucial role in energy metabolism by increasing blood glucose levels during fasting or low-energy states. Released by the pancreas, glucagon prompts the liver to convert stored glycogen into glucose, making it available for energy. This hormone counteracts insulin’s effect, which lowers blood glucose levels. Glucagon is critical for maintaining balanced blood sugar levels, especially during periods of intense physical activity or between meals. Overall, it facilitates energy availability and supports metabolism when carbohydrates are limited in the body.