An adult weighing 70 kg follows a diet that provides a total of 2000 kcal per day. The macronutrient distribution is 55 % carbohydrate, 35 % fat and 10 % protein. (Carbohydrate and protein each supply 4 kcal g⁻¹, fat supplies 9 kcal g⁻¹.) The recommended protein intake is 0.8 g per kg body weight per day.

(a) Calculate the amount of protein (in grams) supplied by the diet.

(b) Determine how many additional grams of protein the adult must obtain to meet the recommendation, assuming the extra protein replaces an equal caloric amount of carbohydrate while total energy intake remains 2000 kcal.

Question

An adult weighing 70 kg follows a diet that provides a total of 2000 kcal per day. The macronutrient distribution is 55 % carbohydrate, 35 % fat and 10 % protein. (Carbohydrate and protein each supply 4 kcal g⁻¹, fat supplies 9 kcal g⁻¹.) The recommended protein intake is 0.8 g per kg body weight per day.

(a) Calculate the amount of protein (in grams) supplied by the diet.

(b) Determine how many additional grams of protein the adult must obtain to meet the recommendation, assuming the extra protein replaces an equal caloric amount of carbohydrate while total energy intake remains 2000 kcal.

Accepted Answer

Protein supplied: 50 g; additional protein required: 6 g (replacing 6 g carbohydrate)

Igcse Model Questions Vol1 2025 Biology Question 21

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