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Option 3 : Fat
The correct answer is Fat.
- Fats are the slowest source of energy but the most energy-efficient form of food.
- Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates.
- Because fats are such an efficient form of energy, the body stores any excess energy as fat.
- Fats form the most concentrated source of energy in our diet.
- 1 gram of fat yields 9.5 kcal of energy which is the highest among the food components.
- 1 gram of carbohydrates and proteins yield an almost similar amount of energy which is equal to 4 kcal.
- Fats and ethanol have the greatest amount of food energy per mass, 37 and 29 kJ/g (8.8 and 6.9 kcal/g), respectively.
- Proteins and most carbohydrates have about 17 kJ/g (4.1 kcal/g).
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