Which statement best defines energy density in foods?

• A. Energy density—the calories per gram of food
• B. Glycemic index
• C. Total calories per serving
• D. Basal metabolic rate

Answer: (A)

Energy density measures how many calories are packed into a given amount of food, typically expressed as calories per gram. This matters because it shows how many calories you get from a small amount of food versus a larger amount, independent of portion size. Foods with high energy density, like fats and oils, deliver many calories in a small weight, while foods with low energy density, such as fruits, vegetables, and soups with lots of water, deliver fewer calories for the same weight. This concept is distinct from other terms: the glycemic index is about how quickly carbohydrate-containing foods raise blood glucose, total calories per serving is the energy content of a whole serving (not per unit weight), and basal metabolic rate is the body's energy use at rest. Understanding energy density helps in planning meals for weight management and satiety.