Certified Dietary Manager (CDM) Practice Exam

What is the primary source of energy for the human body?

1. Proteins

2. Fats

3. Vitamins

4. Carbohydrates

The correct answer is: Carbohydrates

Carbohydrates are the primary source of energy for the human body because they are easily broken down into glucose, which is then utilized by the cells for energy. This process is essential as glucose is essential for the functioning of the brain, muscles, and other organs that need a quick and efficient energy source, especially during physical activity or mentally demanding tasks. Carbohydrates are classified into simple sugars, starches, and fiber. Simple sugars provide immediate energy, while starches offer a more sustained energy release when digested. The body's preference for carbohydrates as an energy source is due to its ability to convert them faster and more efficiently into usable energy compared to proteins and fats. While proteins and fats also serve as important energy sources, they are typically utilized when carbohydrate stores are low. Vitamins, on the other hand, do not provide energy; instead, they play various roles in metabolic processes that facilitate energy production. Hence, carbohydrates stand out as the primary source of energy vital for everyday functioning and overall health.