Important nutrients for maintaining energy levels during workouts include carbohydrates, which provide immediate energy, and proteins, which are essential for muscle repair. Additionally, healthy fats, such as those found in nuts and avocados, contribute to sustained energy over longer sessions. It's also vital to stay hydrated before, during, and after exercise to prevent fatigue and optimize performance. Incorporating a balanced diet rich in these nutrients ensures the body has the resources it needs to perform effectively and recover properly.