In the context of energy balance, approximately how many kilocalories (kcal) are stored in 1 pound (lb) of body fat?

• A. About 3,500 kcal
• B. About 7,000 kcal
• C. About 500 kcal
• D. About 1,500 kcal

Answer: (A)

Verified step by step guidance

1. Understand that body fat stores energy in the form of triglycerides, and the energy content of fat is typically measured in kilocalories (kcal).
2. Recall that 1 pound (lb) of body fat is commonly estimated to contain a specific amount of stored energy based on research and nutritional science.
3. Know that the energy content of fat tissue is approximately 9 kcal per gram, but since body fat is not 100% pure fat, the effective energy stored per gram of body fat is slightly less.
4. Use the conversion factor that 1 pound equals 454 grams, and multiply this by the average kcal per gram of body fat to estimate the total kcal stored in 1 lb of body fat.
5. Recognize that this calculation leads to the widely accepted estimate that 1 pound of body fat stores about 3,500 kcal of energy.