Liver glycogen stores of 100 grams provide approximately how many kilocalories?

• A. 180 kcal
• B. 600 kcal
• C. 390 kcal
• D. 900 kcal

Answer: (C)

Glycogen is a carbohydrate energy store, and carbohydrates are valued at about 3.9 kcal per gram in practical nutrition calculations (often rounded to 4 kcal/g). If the liver contains about 100 g of glycogen, the energy available from it is 100 g × 3.9 kcal/g ≈ 390 kcal. This is why 390 kcal is the best estimate for 100 g of liver glycogen.