What is the equivalent of 2.5 pounds (1.13 kg) of body fat in kilocalories?

5,250 kilocalories corresponds to 1.5 pounds of fat (1.5 x 3,500 kcal/lb), not the 2.5 pounds specified in the question.

7,000 kilocalories corresponds to 2 pounds of fat (2 x 3,500 kcal/lb), falling 1,750 kcal short of the correct value for 2.5 pounds.

8,000 kilocalories does not correspond to any standard pound-based fat calculation using the accepted 3,500 kcal/lb conversion factor.

One pound of body fat is equivalent to approximately 3,500 kilocalories of stored energy, a value derived from the energy density of adipose tissue and widely used in exercise science and nutrition. Multiplying 2.5 pounds by 3,500 kcal/lb produces 8,750 kilocalories, making D the correct answer. This figure is essential for estimating the cumulative caloric deficit or surplus needed to achieve a target change in body fat over time.