Question

Use the table to calculate the total Calories in each food.

Calorie Content and Examples of Carbohydrates, Proteins and Fats

Type of biomolecule	Representative foods	Calorie content (Cal/g)
carbohydrates	rice, potatoes, bread, vegetables, fruit, whole milk	4
proteins	fish, meat, dairy products, beans, legumes, whole milk	4
fats	oils, butter, margarine, animal fats, whole milk	9

Calculate the total Calories in a 10 oz rib eye steak containing 69 g protein, 63 g fat, and 0 g carbohydrate.

a 10 oz rib eye steak:

Cal

Calculate the total Calories in one cup of 1% milk containing 8 g protein, 2.4 g fat, and 12 g carbohydrate.

one cup of 1% milk:

Cal

Answer 1

1- The given mass of rib eye = 10 oz

Given mass of protein present = 69 g

Now the calories produced from 1 g of protein = 4 cal

So calories produced from 69 g of protein = 4 cal * 69 = 276‬ cal

Similarly-

Given mass of fat present = 63 g

Now the calories produced from 1 g of fat = 9 cal

So calories produced from 69 g of fat = 9 cal * 63 = 567‬‬ cal

And

Given mass of carbohydrate present = 0 g

So calories produced from 0 g of carbohydrate = 0‬‬ cal

So total calories produced from 10 oz of rib eye = 276‬ cal + 567‬‬ cal + 0‬‬ cal

=  843‬ cal

2- The given one cup of 1% milk contain

Given mass of protein present = 8 g

Now the calories produced from 1 g of protein = 4 cal

So calories produced from 8 g of protein = 4 cal * 8 = 32‬ cal

Similarly-

Given mass of fat present = 2.4 g

Now the calories produced from 1 g of fat = 9 cal

So calories produced from 2.4 g of fat = 9 cal * 2.4 = 21.6‬‬‬ cal

And

Given mass of carbohydrate present = 12 g

So calories produced from 12 g of carbohydrate = 12 * 4 = 48‬‬ cal

So total calories produced from one cup of 1% milk = 32‬ cal + 21.6‬‬‬ cal + 48‬‬ cal

=  101.6‬ cal