Given a daily intake of 2100 kcal with 50% carbohydrates, 20% protein, and 30% fat, estimate daily grams of carbohydrate, protein, and fat.

• A. Carbohydrates ≈262–263 g; Protein ≈105 g; Fat ≈70 g
• B. Carbohydrates ≈260 g; Protein ≈110 g; Fat ≈60 g
• C. Carbohydrates ≈320 g; Protein ≈90 g; Fat ≈70 g
• D. Carbohydrates ≈242 g; Protein ≈100 g; Fat ≈80 g

Answer: (A)

Start with the energy per gram for each macronutrient: carbohydrates 4 kcal/g, protein 4 kcal/g, fat 9 kcal/g. To find daily grams from a total of 2100 kcal with a 50/20/30 distribution, multiply 2100 by each percentage and then divide by the relevant kcal per gram.

Carbohydrates: 50% of 2100 = 1050 kcal; 1050 ÷ 4 ≈ 262.5 g → about 262–263 g.

Protein: 20% of 2100 = 420 kcal; 420 ÷ 4 = 105 g.

Fat: 30% of 2100 = 630 kcal; 630 ÷ 9 = 70 g.

Total energy checks out: 1050 + 420 + 630 = 2100 kcal. This yields approximately 262–263 g carbs, 105 g protein, and 70 g fat, which matches the given correct option. Other choices deviate from these gram amounts or would not sum to 2100 kcal when using 4 kcal/g for carbs and protein and 9 kcal/g for fat.