The body stores energy from food primarily in the form of glycogen and fat. After consuming food, carbohydrates are broken down into glucose, which can either be used immediately for energy or converted to glycogen and stored in the liver and muscles for later use. When glycogen stores are full, excess glucose is converted into fat for long-term energy storage. During physical activity or periods of fasting, the body can mobilize these energy stores: glycogen is converted back into glucose, while fat is broken down into fatty acids for energy. This energy management is crucial for maintaining body functions.