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

• A. About 7,700 kcal
• B. About 1,500 kcal
• C. About 3,500 kcal
• D. About 500 kcal

Answer: (C)

Verified step by step guidance

1. Understand that body fat stores energy, and this energy can be measured in kilocalories (kcal), which are commonly referred to as Calories in nutrition.
2. Recognize that the energy content of 1 pound (lb) of body fat is a standard estimate used in nutrition and weight management to relate changes in body weight to energy intake or expenditure.
3. Recall that the widely accepted value for the energy stored in 1 lb of body fat is approximately 3,500 kcal. This means that to lose or gain 1 lb of fat, there needs to be a deficit or surplus of about 3,500 kcal.
4. This estimate comes from the fact that 1 gram of fat contains about 9 kcal, and since 1 lb equals approximately 454 grams, multiplying 454 grams by 9 kcal/gram gives a rough total energy content close to 4,086 kcal. However, because body fat tissue is not pure fat (it contains water and other components), the effective energy stored is lower, around 3,500 kcal.
5. Therefore, when considering energy balance and weight change, use the value of about 3,500 kcal per pound of body fat as a practical guideline.