What happens to body energy if you don't use it?

If you don't use the energy your body produces, primarily from the calories you consume, it is stored as fat for future use. This excess energy can lead to weight gain if consistently not utilized through physical activity. Additionally, prolonged inactivity and excess energy storage can contribute to metabolic issues and increase the risk of various health conditions. Overall, balancing energy intake with energy expenditure is crucial for maintaining a healthy body.