Here are the essential concepts you must grasp in order to answer the question correctly.
Macronutrient Energy Values
Macronutrients—carbohydrates, fats, and proteins—provide energy measured in kilojoules. Carbohydrates and proteins each yield approximately 17 kJ per gram, while fats provide about 37 kJ per gram. Understanding these values is essential for calculating the total energy content of food based on its macronutrient composition.
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Energy Calculation
To determine the total energy in a food item, multiply the grams of each macronutrient by its respective energy value. For example, in the case of peanut butter, you would calculate the energy from carbohydrates, fats, and proteins separately, then sum these values to find the total kilojoules.
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Rounding Off Numbers
Rounding off is a mathematical process used to simplify numbers to a specified place value. In this context, rounding to the tens place means adjusting the final total kilojoules to the nearest ten. This is important for reporting energy values in a clear and standardized manner.
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