B vitamins play a crucial role in energy metabolism, particularly in converting carbohydrates, fats, and proteins into usable energy. Each vitamin, such as thiamine (B1), riboflavin (B2), and niacin (B3), has specific functions in the metabolic process. For example, B12 is essential for nerve function and red blood cell production, while folate aids in DNA synthesis. A deficiency in these vitamins can lead to fatigue, weakness, and impaired performance. Thus, adequate B vitamin intake through a balanced diet or supplementation can support physical activity and overall energy levels.