How many kcal of energy per gram do fats provide?

Appeared in: DSSSB - 29 August 2019 (Shift-1)

Explanation

Fats are the most calorically dense macronutrient.
According to standard nutritional science, 1 gram of fat provides approximately 9 kilocalories (kcal) of energy.
This value is used in nutrition to calculate the total energy content of foods.
Compared to fats, carbohydrates and proteins provide less than half the energy per gram (4 kcal/g each).

Option B: 10 kcal/g is an incorrect value for the energy content of fat. It overestimates the standard accepted value.
Option C: 11 kcal/g is an incorrect and high estimate for the energy provided by fat.
Option D: 8 kcal/g is an incorrect value. While closer than 10 or 11, it still underestimates the energy density of fat. 7 kcal/g is the value for alcohol.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Macronutrient Energy Content as background academic context rather than a clinical decision trigger.
Understanding the caloric density of macronutrients is fundamental for nurses in patient education regarding diet, weight management, and chronic disease prevention.
For patients with conditions like obesity, diabetes, or cardiovascular disease, nurses can provide counseling on reducing high-fat foods to manage caloric intake and improve health outcomes.
What if? If a patient needs to gain weight, such as in cases of malnutrition or after surgery, a nurse would recommend incorporating healthy, energy-dense fats (like avocados, nuts, and olive oil) into their diet to increase caloric intake efficiently.

How to Approach the Question

Identify the core question: The question asks for a specific factual value - the energy (in kcal) provided by one gram of fat.
This is a direct recall question from basic nutrition science.
Recall the standard energy values for the three main macronutrients: Carbohydrates, Proteins, and Fats.
Remember that carbohydrates and proteins both provide 4 kcal/gram.
Recall that fat is the most energy-dense, providing more than double the energy of carbs or protein.
Select the option that matches the known value for fat, which is 9 kcal/gram.

Concept Tested & Keywords

QCdwz_nFRAWGk-3_67A79Y

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) pp. 261-263, 258-260

Practise the full DSSSB - 29 August 2019 (Shift-1)

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