Question
4 kilo calories of energy is released by ________.
The correct answer is
one gram of protein
Understanding Energy Release from Macronutrients
The question asks to identify the substance and its quantity that releases 4 kilocalories (kcal) of energy.
Dietary energy is primarily provided by three macronutrients: proteins, carbohydrates, and fats. Each gram of these macronutrients provides a different amount of energy, measured in kilocalories (kcal).
- Proteins: Provide approximately 4 kcal per gram.
- Carbohydrates: Provide approximately 4 kcal per gram.
- Fats: Provide approximately 9 kcal per gram.
Analyzing the Options for Energy Release
Let's examine the energy released by the quantities mentioned in the options:
| Option | Substance / Quantity | Approximate Energy Released | Calculation |
| 1 | 4 grams of proteins | 16 kcal | $4 \text{ grams} \times 4 \text{ kcal/gram} = 16 \text{ kcal}$ |
| 2 | one gram of protein | 4 kcal | $1 \text{ gram} \times 4 \text{ kcal/gram} = 4 \text{ kcal}$ |
| 3 | one gram of sugar (carbohydrate) | 4 kcal | $1 \text{ gram} \times 4 \text{ kcal/gram} = 4 \text{ kcal}$ |
| 4 | 4 grams of fat | 36 kcal | $4 \text{ grams} \times 9 \text{ kcal/gram} = 36 \text{ kcal}$ |
Identifying the Correct Energy Source
Based on the standard energy values:
- Option 1 is incorrect because 4 grams of protein release 16 kcal, not 4 kcal.
- Option 2 is correct. One gram of protein releases approximately 4 kcal of energy.
- Option 3 (one gram of sugar) also releases approximately 4 kcal. However, given the specific correct answer provided, the question intends to highlight the value for protein.
- Option 4 is incorrect because 4 grams of fat release 36 kcal, not 4 kcal.
Therefore, the statement "4 kilo calories of energy is released by one gram of protein" is accurate based on typical nutritional values.
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Important Questions from Food and its Components
- What is the primary reason that roughage is included in a balanced human diet?
- Which statement is true regarding a balanced diet?
- Which of the following represent disaccharides?
- Which of the following is classified as micronutrients?
- Which of the following correctly represents the function of dietary fibre in the human diet?
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