Vitamins play a critical role in supporting energy levels by aiding in the metabolic processes that convert food into usable energy. For example, the B vitamins, including B12 and B6, are essential for energy production as they facilitate the body's ability to metabolize carbohydrates, fats, and proteins. A deficiency in these vitamins can lead to fatigue and decreased physical performance. Therefore, ensuring adequate vitamin intake through a balanced diet is crucial for sustaining energy and enhancing overall health and fitness.