Which of the following are fat-soluble vitamins, except one?

Appeared in: MP CHO-2018

Explanation

Vitamins are classified into two main groups based on their solubility: fat-soluble and water-soluble.
The fat-soluble vitamins are A, D, E, and K. A common mnemonic to remember them is 'ADEK'.
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin.
The question requires identifying the exception among fat-soluble vitamins, which is Vitamin C.

Option A: This is incorrect because Vitamin A (Retinol) is a classic example of a fat-soluble vitamin.
Option B: This is incorrect because Vitamin D (Calciferol) is a fat-soluble vitamin essential for calcium metabolism and bone health.
Option C: This is incorrect because Vitamin E (Tocopherol) is a fat-soluble vitamin known for its antioxidant properties.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of vitamins based on solubility as background academic context rather than a clinical decision trigger.
Understanding vitamin solubility is critical for patient education on diet and supplementation. Nurses must explain that fat-soluble vitamins can accumulate to toxic levels (hypervitaminosis), while water-soluble vitamins are generally excreted if taken in excess.
Patients with conditions affecting fat absorption (e.g., cystic fibrosis, celiac disease, cholestasis) are at high risk for fat-soluble vitamin deficiencies (A, D, E, K) and may require special water-miscible formulations.
What if? If a patient is on a very low-fat diet, they would have difficulty absorbing Vitamins A, D, and E, but their absorption of Vitamin C would remain unaffected as it does not depend on dietary fat.

How to Approach the Question

First, identify the keyword 'except'. This signals that you need to find the option that does not belong to the group mentioned (fat-soluble vitamins).
Next, recall the two main classifications of vitamins: fat-soluble and water-soluble.
Mentally list the vitamins in each category. A common mnemonic for fat-soluble vitamins is 'ADEK'.
Evaluate each option against this classification: Vitamin A is fat-soluble, Vitamin D is fat-soluble, and Vitamin E is fat-soluble.
Identify Vitamin C as the outlier, as it is a water-soluble vitamin.
Therefore, Vitamin C is the correct answer because it is the exception.

Concept Tested & Keywords

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E6 Biochemistry U Satyanarayana— Part 1 (pp 26-420 of 840) pp. 150-152, 149-151, 151-153

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