How many calories does 1 gm of fat give?

Appeared in: RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Explanation

One gram of fat yields 9 kilocalories (kcal) of energy.
Fat is the most calorically dense macronutrient, providing more than double the energy of carbohydrates or protein per gram.
This high energy density makes fat an efficient energy storage molecule in the body.
Understanding this value is fundamental for calculating dietary energy intake and planning nutritional interventions.

Option A: The value of 8 kcal/g is an incorrect approximation for the energy content of fat.
Option C: One gram of carbohydrate or one gram of protein provides 4 kcal of energy, not fat.
Option D: The value of 6 kcal/g is not the standard caloric value for any of the three main macronutrients (fat, protein, carbohydrates).

Visual 1: Bar Chart - A chart comparing the caloric density (kcal/g) of fats, proteins, carbohydrates, and alcohol side-by-side to visually emphasize that fat is the most energy-dense.
Visual 2: Infographic - An infographic showing common food sources for each macronutrient (e.g., avocado/oil for fats, bread/rice for carbs, chicken/beans for protein) along with their respective caloric values.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Caloric value of macronutrients as background academic context rather than a clinical decision trigger.
Understanding the caloric value of macronutrients is essential for nurses when providing dietary education to patients, especially those with conditions like obesity, diabetes, or cardiovascular disease.
Nurses use this knowledge to help patients with weight management, either for weight loss (caloric deficit) or weight gain (caloric surplus).
It is critical for calculating the nutritional needs of patients receiving enteral or parenteral nutrition to ensure they receive adequate energy.

How to Approach the Question

This is a factual recall question that tests foundational knowledge in nutrition.
Identify the core components of the question: 'calories' and 'fat'.
Recall the standard energy values for the three main macronutrients.
Compare the recalled value for fat with the given options.
Select the option that matches the known caloric value of fat, which is 9 kcal/gram.

Concept Tested & Keywords

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Practise the full RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Attempt every question from this paper in a timed mock, then review the full solution for each one.