Which term refers to the body's main source of energy, existing in complex and simple forms?

• A. Carbohydrates
• B. Healthy Diet
• C. Creaming Method
• D. Nutrition Facts Label

Answer: (A)

Carbohydrates are the body's main energy source because they can be quickly converted into glucose, the fuel that cells actively use to produce energy. They come in two forms: simple carbohydrates (sugars) that are digested rapidly, and complex carbohydrates (starches and dietary fiber-containing foods) that take longer to break down and provide more sustained energy. After digestion, glucose enters the bloodstream and is taken up by cells to produce ATP through metabolic pathways like glycolysis and the Krebs cycle. Foods rich in complex carbohydrates often deliver other nutrients and fiber, which helps with digestion and steady energy levels. The other options don’t name an energy source: a healthy diet describes overall eating patterns, the creaming method is a cooking technique, and a Nutrition Facts label is a packaging tool. So, the term that fits is carbohydrates.