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Macronutrients are substances required in large amounts to provide the energy necessary for maintaining bodily functions and supporting physical activities. They are primarily categorized into three main types: carbohydrates, proteins, and fats. Each of these macronutrients plays a vital role in the body's metabolism, growth, and repair processes. Carbohydrates serve as the body's main energy source, proteins are essential for tissue repair and growth, and fats provide a concentrated source of energy and support various bodily functions.

The other options describe nutrients but do not accurately characterize macronutrients. Vitamins and minerals, for instance, are classified as micronutrients, which are needed in smaller quantities and do not provide energy. Dietary supplements can include macronutrients, micronutrients, and other compounds, but they are not synonymous with macronutrients themselves. Digestible fiber falls under the category of carbohydrates but is not classified as a macronutrient in the traditional sense, as it does not provide usable energy in the way the primary macronutrients do. Thus, the identification of macronutrients as the primary nutrients that provide energy is correct and underscores their importance in nutrition.