What is the main purpose of vitamins in the diet?

Vitamins play a crucial role in regulating bodily functions and maintaining overall health. They are organic compounds that the body needs in small amounts to function properly and support numerous physiological processes. Each vitamin has specific functions, such as aiding in the synthesis of enzymes, hormones, and other substances that are vital for growth, digestion, and nerve function.

For instance, some vitamins act as antioxidants, protecting cells from damage, while others contribute to processes like blood coagulation and energy metabolism. By participating in these various roles, vitamins help ensure that the body's systems operate efficiently, thus promoting overall well-being.

While it's important to note that vitamins do not directly provide energy, they facilitate the release of energy from macronutrients (like carbohydrates and fats). This connection illustrates their support of metabolic functions, which, while significant, is a subset of their broader role in maintaining health. Building muscle mass is more closely associated with macronutrients such as proteins rather than vitamins. Therefore, the main purpose of vitamins can best be summarized as regulating bodily functions and maintaining health, making this the most accurate answer.