Question

One glass of milk shake containing 17 g of carbohydrates, 9 g fat and 8 g protein will provide how many Kilocalories?

• A. 215
• B. 198
• C. 181
• D. 166

Hint:

Remember the Atwater factors of 4-9-4 (Carbohydrate-Fat-Protein) to quickly solve energy calculation questions in examinations.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The physiological energy value of food is calculated based on the concentrations of its energy-yielding macronutrients.
According to the Atwater system, carbohydrates, fats, and proteins provide standard amounts of metabolizable energy per gram.
Key Formula or Approach:
The Atwater physiological energy factors are: \[ 1\text{ g of Carbohydrate} = 4\text{ kcal} \] \[ 1\text{ g of Protein} = 4\text{ kcal} \] \[ 1\text{ g of Fat} = 9\text{ kcal} \] The total energy of a food portion is calculated as: \[ \text{Total Energy (kcal)} = (\text{g Carbohydrate} \times 4) + (\text{g Protein} \times 4) + (\text{g Fat} \times 9) \]

Step 2: Detailed Explanation:
Given the macronutrient composition of one glass of milk shake:
- Carbohydrates = \(17\text{ g}\)
- Fat = \(9\text{ g}\)
- Protein = \(8\text{ g}\)
Let us calculate the energy contribution of each macronutrient:
- Energy from Carbohydrates: \[ 17\text{ g} \times 4\text{ kcal/g} = 68\text{ kcal} \]
- Energy from Protein: \[ 8\text{ g} \times 4\text{ kcal/g} = 32\text{ kcal} \]
- Energy from Fat: \[ 9\text{ g} \times 9\text{ kcal/g} = 81\text{ kcal} \]
Summing these values to find the total energy: \[ \text{Total Energy} = 68\text{ kcal} + 32\text{ kcal} + 81\text{ kcal} = 181\text{ kcal} \]
Therefore, the milkshake provides \(181\text{ kcal}\).

Step 3: Final Answer:
The milkshake provides a total of 181 Kilocalories.