Concept:Lipids provide the highest amount of energy per gram among all food nutrients.
Explanation:Lipids yield about
9 kilocalories per gram.
Carbohydrates and proteins each yield only about
4 kilocalories per gram.
Therefore, lipids supply more than twice as much energy as carbohydrates or proteins.
Fats and oils are common forms of lipids.
Fats are solid at room temperature, while oils are liquid.
Although carbohydrates are metabolised most quickly, lipids remain the most concentrated energy source.
This is why the body stores excess energy mainly as fat.
Answer:Option C, lipid.