Which of the following is defined by 9 calories per gram?

The correct answer pertains to the caloric content of fat, which is defined as providing 9 calories per gram. Understanding this is crucial for nutritional science and diet planning, as fat is a dense source of energy compared to carbohydrates and proteins, both of which provide fewer calories per gram. Specifically, carbohydrates and proteins each contribute 4 calories per gram, while alcohol provides approximately 7 calories per gram. This distinction is important when calculating dietary intake and energy balance for various health and fitness goals. Recognizing the higher caloric density of fat also helps in understanding weight management strategies, as higher calorie consumption from fat can lead to weight gain if not balanced with energy expenditure.