The phrase "stored fat for energy" means that a person's body has reserves of fat that it can use as a source of fuel when needed. This is because fats are an important source of energy for our bodies, and they provide more than twice the amount of calories per gram compared to carbohydrates or proteins. When we consume more calories than we need, our body stores the excess in fat cells for future use. During periods of fasting or increased physical activity, the body can break down these stored fats and use them as fuel. This process is known as "lipolysis" and it helps to keep us energized throughout the day.