A 250 kcal yogurt serving contains 8 g of fat and 10 g of protein. How many grams of carbohydrate must be present for the label to be accurate? Show your calculation.

• A. About 45 g, since labels usually overstate carbohydrate content by ~30% and you must adjust upward for absorption inefficiencies.
• B. Zero grams are required because the remaining energy must come from unlisted alcohol content typically in yogurts.
• C. Approximately 17.25 g, obtained by halving the computed carbs to correct for fiber subtraction commonly applied on labels.
• D. Approximately 34.5 g of carbohydrate (because 250 − (8×9 + 10×4) = 138 kcal; 138 ÷ 4 = 34.5 g).

Answer: (D)