Calories generated per gram of fat is approximately?

Appeared in: AIIMS Patna NO - 2020

Explanation

Fat is the most energy-dense macronutrient, providing approximately 9 kilocalories (kcal) per gram.
This value is more than double the energy provided by carbohydrates and proteins, which each supply 4 kcal per gram.
Due to its high energy density, fat serves as a major form of energy storage in the body.
This information is foundational for calculating dietary intake and planning nutritional interventions.

Option A: 4 Kcals is the energy provided by one gram of protein or one gram of carbohydrate, not fat.
Option B: 15 Kcals per gram is an incorrect value and is not associated with any macronutrient.
Option C: 1 Kcal per gram is an incorrect and significantly underestimated value for the energy content of fat.

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 fundamental for nurses when providing dietary education to patients for weight management, diabetes control, and cardiovascular health.
Nurses use this knowledge to help patients calculate daily caloric intake and create balanced meal plans that meet their specific health goals.
What if? If a patient needs to be on a calorie-restricted diet for weight loss, the nurse would advise limiting high-fat foods because they are the most calorically dense, making it easier to exceed the daily calorie limit.

How to Approach the Question

Identify the core question: It asks for a specific factual value from the field of nutrition—the number of calories in a gram of fat.
This is a factual recall question. Access your knowledge of basic nutrition.
Recall the standard caloric values for the three main macronutrients: carbohydrates, proteins, and fats.
Remember that fat is the most energy-dense nutrient, providing more calories per gram than the others.
Compare the recalled values to the given options: Carbohydrates = 4 kcal/g, Proteins = 4 kcal/g, and Fat = 9 kcal/g.
Select the option that correctly matches the caloric value for fat.

Concept Tested & Keywords

QW9PY7YgQOriMtgHtHrH0x

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 436-438

E6 textbook of Applied Biochemistry and Nutrition & DieteticsHarbans Lal (pp 26-464 of 479) p. 261-263

E6 Medicine Harrison 22e Part 2 p. 502-504

Practise the full AIIMS Patna NO - 2020

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