Which of the following is significantly different between human and cow's milk?

OSSSC Nursing Officer-2023

Biochemistry & Nutrition

Medium

Appeared in: OSSSC Nursing Officer-2023

Explanation

The most significant macronutrient differences between human and cow's milk are in protein and sugar (carbohydrates).
Cow's milk contains approximately three times more protein (3.3 g/dL) than human milk (1.1 g/dL). This high protein load, primarily casein, is difficult for an infant's immature kidneys to process.
Human milk has a significantly higher sugar content (7.0-7.5 g/dL) compared to cow's milk (4.4-5.0 g/dL). This sugar is mainly lactose, which is crucial for brain development and provides energy.
The term 'sugar' is also more encompassing because human milk contains complex sugars called oligosaccharides, which promote a healthy gut microbiome and are largely absent in cow's milk.

Option A: The total quantity of fat is quite similar in both human milk (approx. 3.8 g/dL) and cow's milk (approx. 3.8 g/dL). The primary difference in fats lies in their composition (types of fatty acids), not the total amount.
Option C: While this is factually correct, as lactose is the primary sugar in milk, the option 'Proteins and sugar' is considered a better answer. 'Sugar' is a broader category that includes not only lactose but also the beneficial oligosaccharides unique to human milk, making the total carbohydrate difference even more significant.
Option D: While the mineral content is significantly different (cow's milk has about four times more minerals), this option only lists one component. The question asks to identify the most significant differences, and the combination of high protein and different sugar levels has the most profound physiological impact on an infant.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional composition differences between human and cow's milk as background academic context rather than a clinical decision trigger.
Understanding the differences between human and cow's milk is fundamental in pediatric nursing and nutrition. It explains why unmodified cow's milk should not be given to infants under one year of age.
The high protein and mineral content in cow's milk creates a high renal solute load, which can strain or damage an infant's immature kidneys, leading to dehydration and electrolyte imbalance.
Infant formulas are specifically designed to mimic the composition of human milk by reducing protein and mineral content and increasing carbohydrate (lactose) content from a cow's milk base.

How to Approach the Question

First, identify the core of the question, which is to find the most significant nutritional differences between human and cow's milk.
Recall or look up the basic composition of both milks. Key components are proteins, fats, carbohydrates (sugars), and minerals.
Evaluate each option against the facts. Eliminate options that contain incorrect information. For example, the total fat content is similar, so 'Proteins and fat' is incorrect.
Compare the remaining options. Both 'Proteins and sugar' and 'Proteins and lactose' seem correct. Recognize that lactose is the main sugar in milk.
Consider the nuance. 'Sugar' is a broader term than 'lactose'. Human milk also contains other important sugars (oligosaccharides) that cow's milk lacks. This makes the total 'sugar' difference even more significant than just the 'lactose' difference.
Therefore, 'Proteins and sugar' is the most accurate and comprehensive answer among the choices.

Concept Tested & Keywords

Concept Tested: Nutritional composition differences between human and cow's milk.
Stem keywords: human milk, cow's milk, significantly different
Lead-in keywords: Which of the following

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