Eating breakfast can significantly impact metabolism by kickstarting the body's energy expenditure after fasting overnight. A nutritious breakfast increases the thermic effect of food, which refers to the calories burned during digestion. Additionally, it helps maintain stable blood sugar levels and can reduce cravings later in the day. Foods rich in protein and fiber are particularly beneficial for sustaining satiety and energy levels. Overall, having a balanced breakfast sets a positive metabolic tone for the entire day.