The Atwater method is an approach to estimate the energy content of foods based on assumed yield from metabolism of different macronutrients. By measuring the contribution by mass of major types in a food (or meal) we can estimate the calories in a meal, such estimates vary in accuracy from person-to-person.

Which of the following is predicted to yield 9 kcal/g of nutrient source?

Question

The Atwater method is an approach to estimate the energy content of foods based on assumed yield from metabolism of different macronutrients. By measuring the contribution by mass of major types in a food (or meal) we can estimate the calories in a meal, such estimates vary in accuracy from person-to-person.

Which of the following is predicted to yield 9 kcal/g of nutrient source?

BlackTom AI · Accepted Answer

To tackle the question, I’ll examine each nutrient option and its typical energy yield in calories per gram, then relate it to the Atwater general values.
Option 1: Protein. In the Atwater system, protein typically yields about 4 kcal per gram. Therefore, this option does not match the 9 kcal/g mark and is not the predicted energy yield for fat.
Option 2: Starch. Starch is a carbohydrate, and carbohydrates generally yield around 4 kcal per gram as well. Since the target 9 kcal/g is higher, starch would not be predicted to yield 9 kcal/g.
Option 3: Fat (Triglycerides). Fat is classically assigned an energy value of about 9 kcal per gram in the Atwater method. This matches the expected high-energy yield per gram and aligns with standard estimates for lipid energy content.
Option 4: Inulin. Inulin is a type of carbohydrate (a fructan) often considered a fermentable fiber with limited digestible energy in humans, and its practical energy yield is far less than 9 kcal/g. It does not fit the typical Atwater value of 9 kcal/g for fat.
In summary, the energy density of macronutrients in standard Atwater values places fats (triglycerides) at approximately 9 kcal per gram, while proteins and carbohydrates (like starch) are around 4 kcal/g, and inulin does not contribute near 9 kcal/g due to limited digestible energy. The only option that predicts 9 kcal/g is fat (triglycerides).

MEDS2012 (ND) Module 1 Quiz Wednesday AM

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