Question

3.36 a high - protein diet contains 70.0 g of carbohydrate, 5.0 g of fat, and 150 g of protein. how much energy, in kilocalories and kilojoules, does this diet provide? (round off the answer for each food type to the tens place.)

Explanation:

Step1: Determine energy per gram of each nutrient

Carbohydrates and proteins provide 4 kcal/g and 4 kJ/g, fat provides 9 kcal/g and 38 kJ/g.

Step2: Calculate energy from carbohydrates in kcal

$E_{carb - kcal}=70.0\ g\times4\ kcal/g = 280\ kcal$

Step3: Calculate energy from carbohydrates in kJ

$E_{carb - kJ}=70.0\ g\times4\ kJ/g = 280\ kJ$

Step4: Calculate energy from fat in kcal

$E_{fat - kcal}=5.0\ g\times9\ kcal/g = 45\ kcal$

Step5: Calculate energy from fat in kJ

$E_{fat - kJ}=5.0\ g\times38\ kJ/g = 190\ kJ$

Step6: Calculate energy from protein in kcal

$E_{protein - kcal}=150\ g\times4\ kcal/g = 600\ kcal$

Step7: Calculate energy from protein in kJ

$E_{protein - kJ}=150\ g\times4\ kJ/g = 600\ kJ$

Step8: Calculate total energy in kcal

$E_{total - kcal}=E_{carb - kcal}+E_{fat - kcal}+E_{protein - kcal}=280 + 45+600=925\ kcal\approx930\ kcal$

Step9: Calculate total energy in kJ

$E_{total - kJ}=E_{carb - kJ}+E_{fat - kJ}+E_{protein - kJ}=280 + 190+600 = 1070\ kJ\approx1070\ kJ$

Answer:

In kilocalories: 930 kcal
In kilojoules: 1070 kJ