Which of the following Vitamin is most sensitive to the effect of Heat?

Appeared in: NCL (MP) Nursing Officer - 2020

Explanation

Vitamin C, also known as ascorbic acid, is a water-soluble vitamin.
Water-soluble vitamins are chemically less stable compared to fat-soluble vitamins.
Vitamin C is particularly susceptible to degradation by heat, as well as by exposure to oxygen and light.
Cooking methods that involve high temperatures and water, such as boiling, can lead to a significant reduction in the Vitamin C content of foods.

Option A: Vitamin A is a fat-soluble vitamin and is relatively stable to heat. It is more sensitive to destruction by light (UV radiation) and oxidation.
Option C: Vitamin K is a fat-soluble vitamin. It is one of the more stable vitamins and is not significantly affected by normal cooking temperatures or processes.
Option D: Vitamin D is a fat-soluble vitamin and is generally considered to be quite stable to heat, especially during cooking.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Properties and stability of vitamins as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in patient education regarding nutrition. Understanding how cooking affects nutrient content allows nurses to provide practical advice for preserving the nutritional value of food.
For patients with deficiencies (like scurvy from Vitamin C deficiency) or those with increased needs (e.g., post-surgery, burn patients), providing guidance on food preparation is essential for recovery.
What if the question asked which vitamin is synthesized by gut bacteria? The answer would include Vitamin K and some B vitamins, highlighting another key property of vitamins.

How to Approach the Question

First, identify the core concept of the question, which is the 'sensitivity to heat' of different vitamins.
Recall the basic classification of vitamins into two groups: water-soluble (B-complex and C) and fat-soluble (A, D, E, and K).
Remember the general rule of thumb for vitamin stability: water-soluble vitamins are generally more labile (less stable) and sensitive to heat, light, and oxygen than fat-soluble vitamins.
Analyze the given options: Vitamin A, D, and K are fat-soluble, while Vitamin C is water-soluble.
Based on the general rule, conclude that Vitamin C is the most likely candidate to be the most sensitive to heat among the choices.

Concept Tested & Keywords

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E6 textbook of Applied Biochemistry and Nutrition & DieteticsHarbans Lal (pp 26-464 of 479) p. 287-289

Practise the full NCL (MP) Nursing Officer - 2020

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