
Concept explainers
Energy is stored as glycogen in liver and the muscle cells of the human body. The most efficient form of energy is stored in the skeletal muscles. If the glycogen stores are fully occupied, then the additional calorie is stored as fat in the body. Nutrients are obtained from foods and these nutrients serve for various purposes like energy storage.

Answer to Problem 1TQ
Lipid stores more energy than carbohydrates and proteins since it contains more energy per gram. Therefore, option c is correct.
Explanation of Solution
Justify the reasons for the correct statement:
Both carbohydrates and lipids are nutrients that can be used for storing energy. The capacities of these nutrients are different in storing energy. Lipids are not digested quickly. Therefore, more energy can be stored for a long term by the lipids. Carbohydrates are hydrolyzed easily, thus the energy is transferred rapidly.
Option (c) is given as, “lipids”.
Hence, option (c) is correct.
Justify the reasons for the incorrect statements:
Option (a) is given as, “proteins”.
Proteins stores less energy when compared to lipids and carbohydrates. Hence, it is a wrong answer.
Option (b) is given as, “carbohydrates”.
Compared to carbohydrates, lipids store more energy. Hence, it is a wrong answer.
Option (d) is given as, “all of the above”.
Lipids are the most important nutrient for storing energy. One of the given options is correct. Hence, it is a wrong answer.
Hence, options (a), (b), and (d) are incorrect.
Lipids store twice the amount of energy compared to carbohydrates. Per gram of lipid contain more energy than carbohydrate.
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