What is the primary function of carbohydrates in the human diet? (Choose the most appropriate option from bel… - Raj. CHO -2025

Raj. CHO -2025

Applied Nutrition & Dietetics

Easy

Appeared in: Raj. CHO -2025

Explanation

Carbohydrates are the main and most efficient source of energy for the body, providing about 4 kcal per gram.
They are digested into monosaccharides, primarily glucose, which is the main circulating sugar used by cells for fuel.
Brain cells and red blood cells are almost entirely dependent on glucose for their energy needs.
Dietary carbohydrates spare proteins from being used as an energy source, allowing them to be used for tissue building and repair.

Option B: Hormone production is not the primary function of carbohydrates. Many hormones are proteins (e.g., insulin) or derived from lipids/fats (e.g., steroid hormones like estrogen and testosterone).
Option C: This is a primary function of dietary fats, not carbohydrates. Fats are required to absorb fat-soluble vitamins (A, D, E, and K).
Option D: This is an administrative option in an exam context and does not represent a physiological function of any nutrient.

Visual 1: Diagram - A flowchart showing the digestion of carbohydrates (starch) into glucose and its subsequent use in glycolysis and the Krebs cycle to produce ATP.
Visual 2: Infographic - A food pyramid or MyPlate diagram illustrating the proportion of carbohydrates, proteins, and fats recommended in a balanced diet.
Visual 3: Chart - A comparison table of the caloric content per gram for carbohydrates, proteins, and fats.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Primary function of carbohydrates in nutrition as background academic context rather than a clinical decision trigger.
Understanding the role of carbohydrates is crucial for patient education, especially for those with diabetes mellitus, who need to monitor their carbohydrate intake to manage blood glucose levels (carbohydrate counting).
In a hospital setting, a patient's carbohydrate intake is critical for recovery. For instance, providing adequate carbohydrates prevents the body from breaking down muscle protein for energy, a process known as protein-sparing.
What if a patient is on a ketogenic diet? In this case, carbohydrate intake is drastically reduced, forcing the body into a state of ketosis where it burns fat for fuel instead of glucose. This has therapeutic applications but also requires careful monitoring.

How to Approach the Question

First, identify the core concept of the question, which is the 'primary function' of a specific macronutrient (carbohydrates).
Recall the three main macronutrients: carbohydrates, proteins, and fats, and their principal roles in the body.
Evaluate the given options based on your knowledge. Ask yourself: 'Is this the main job of carbohydrates?'
Option A, 'Providing energy,' is the well-known primary role of carbohydrates.
Options B and C describe functions primarily associated with proteins and fats, respectively, making them incorrect.
Option D is irrelevant to the biological question. Therefore, select the most accurate and primary function.

Concept Tested & Keywords

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