Certified Dietary Manager (CDM) Practice Exam 2025 – All-in-One Guide to Exam Success!

Carbohydrates are regarded as the body's primary source of energy because they are the most readily available form of fuel for the body's metabolic processes. When consumed, carbohydrates are broken down into glucose, which is then utilized by cells for energy. This quick conversion makes carbohydrates essential for immediate energy needs, particularly during physical activity and high-intensity exercise.

Proteins, while they can be used for energy, mainly serve structural and functional roles in the body, such as building and repairing tissues, making enzymes, and supporting immune function. Fats do store energy and can provide a significant energy source during prolonged, lower-intensity activities; however, they require a more complex metabolic process to convert into usable energy.

Vitamins are essential nutrients that support various biochemical functions in the body but do not provide energy directly. They facilitate the metabolic processes that release energy from carbohydrates, fats, and proteins, but they themselves do not serve as energy sources.

Thus, carbohydrates stand out as the primary nutrient offering direct and efficient energy supply to support daily activities and bodily functions.