A moderately active female with a weight of 56.7 kg requires 18 kcal per 0.45 kg to maintain an ideal weight. How many kilocalories per day does she need?

A moderately active female with a weight of 56.7 kg requires 18 kcal per 0.45 kg to maintain an ideal weight. How many kilocalories per day does she need?

• A. 1 021 kcal
• B. 1 936 kcal
• C. 2 268 kcal
• D. 2 420 kcal

Answer: (C)

To estimate daily maintenance calories, use the given rate of energy per weight unit and apply it to her weight. She weighs 56.7 kg, and each unit is 0.45 kg, so 56.7 ÷ 0.45 = 126 units. Multiply by 18 kcal per unit: 126 × 18 = 2268 kcal per day. A quick check: 18 kcal per 0.45 kg equals 40 kcal per kg, and 56.7 × 40 = 2268. So she needs 2268 kilocalories daily.

To estimate daily maintenance calories, use the given rate of energy per weight unit and apply it to her weight. She weighs 56.7 kg, and each unit is 0.45 kg, so 56.7 ÷ 0.45 = 126 units. Multiply by 18 kcal per unit: 126 × 18 = 2268 kcal per day. A quick check: 18 kcal per 0.45 kg equals 40 kcal per kg, and 56.7 × 40 = 2268. So she needs 2268 kilocalories daily.