Answer:
Triglycerides contain more metabolic energy per unit weight than glycogen because it is water-insoluble. Triglycerides (fats and oils) are important dietary sources of energy and they can be stored in larger quantities than carbohydrates. Fat also functions as a major form of energy storage (9 Cal/g).
Carbohydrate reserves are depleted after about 1 day without food, but stored fat can provide needed calories for 30-40 days
Explanation:
Carbohydrates from dietary sources and glycogen catabolism are used preferentially for energy production by some tissues, such as the brain and active skeletal muscles.
Body stores of glycogen are depleted after only a
few hours of fasting, which requires fatty acids
stored in triglycerides to be used as energy sources.
Even if glycogen supplies are adequate, resting muscle and liver cells use energy from triglycerides because this conserves glycogen stores and glucose for use by brain cells and red blood cells.
