Which term is one of the most important sugars in your body?

• A. Starch
• B. Cellulose
• C. Cholesterol
• D. Glucose

Answer: (D)

Glucose is the body's main source of energy. It’s a simple sugar (a monosaccharide) that cells use in glycolysis to produce ATP, the fuel that powers almost all cellular activities. The brain especially relies on a steady supply of glucose, and blood glucose levels are carefully regulated to meet that demand. When you digest carbohydrates, they’re ultimately turned into glucose in your bloodstream, and the liver and muscles can store extra as glycogen for later use. The other options aren’t sugars in the same sense: starch is a plant storage polysaccharide that gets broken down into glucose, not a small sugar used directly for energy; cellulose is indigestible fiber in plants; cholesterol is a lipid, not a sugar. Because of its immediate availability and central role in energy production, glucose stands out as one of the most important sugars in the body.