Question:
Deficiency of fat-soluble vitamins occurs in:
Deficiency of fat-soluble vitamins occurs in:
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Remember: "Giardia coats the gut." Sucking discs on the duodenum and jejunum block lipid absorption, causing the classic combination of steatorrhea and fat-soluble vitamin deficiency.
Updated On: Aug 13, 2026
- Amoebiosis
- Giardiosis
- Cryptosporidiosis
- Balantidiosis
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Fat-soluble vitamins (A, D, E, and K) require adequate dietary lipid digestion and absorption in the small intestine to be taken up by the host.
Any disease that damages the mucosal architecture of the duodenum and jejunum, or physically blocks the absorptive surface, can interfere with lipid digestion.
This results in steatorrhea (fatty stools) and secondary fat-soluble vitamin deficiencies.
Step 2: Detailed Explanation:
Let us analyze the pathophysiological effects of the given protozoan parasites:
1. Giardiosis (caused by Giardia duodenalis):
The trophozoites of Giardia colonize the duodenum and upper jejunum.
They attach to the brush border of enterocytes using an adhesive ventral sucking disc.
In heavy infections, billions of trophozoites form a physical barrier over the mucosal surface.
Additionally, they cause villous atrophy, microvillar damage, and deconjugation of bile salts by reducing pancreatic lipase activity.
The loss of functional bile salts prevents the emulsification of dietary fats, leading to severe fat malabsorption.
This manifests as pale, bulky, greasy, foul-smelling feces (steatorrhea) accompanied by a failure to absorb fat-soluble vitamins (especially Vitamin A and E).
Therefore, this option is correct.
2. Amoebiosis and Balantidiosis:
These infections are primarily diseases of the large intestine (cecum and colon).
Because lipid and fat-soluble vitamin absorption occurs exclusively in the small intestine, large intestinal protozoa do not directly interfere with fat absorption.
3. Cryptosporidiosis:
While it infects the small intestine, it typically causes acute watery diarrhea due to secretory and osmotic mechanisms rather than chronic steatorrhea and lipid malabsorption.
Step 3: Final Answer:
Giardiosis is characterized by mucosal coverage and bile salt deconjugation in the small intestine, directly leading to fat malabsorption and fat-soluble vitamin deficiencies.
Therefore, the correct answer is option (B).
Fat-soluble vitamins (A, D, E, and K) require adequate dietary lipid digestion and absorption in the small intestine to be taken up by the host.
Any disease that damages the mucosal architecture of the duodenum and jejunum, or physically blocks the absorptive surface, can interfere with lipid digestion.
This results in steatorrhea (fatty stools) and secondary fat-soluble vitamin deficiencies.
Step 2: Detailed Explanation:
Let us analyze the pathophysiological effects of the given protozoan parasites:
1. Giardiosis (caused by Giardia duodenalis):
The trophozoites of Giardia colonize the duodenum and upper jejunum.
They attach to the brush border of enterocytes using an adhesive ventral sucking disc.
In heavy infections, billions of trophozoites form a physical barrier over the mucosal surface.
Additionally, they cause villous atrophy, microvillar damage, and deconjugation of bile salts by reducing pancreatic lipase activity.
The loss of functional bile salts prevents the emulsification of dietary fats, leading to severe fat malabsorption.
This manifests as pale, bulky, greasy, foul-smelling feces (steatorrhea) accompanied by a failure to absorb fat-soluble vitamins (especially Vitamin A and E).
Therefore, this option is correct.
2. Amoebiosis and Balantidiosis:
These infections are primarily diseases of the large intestine (cecum and colon).
Because lipid and fat-soluble vitamin absorption occurs exclusively in the small intestine, large intestinal protozoa do not directly interfere with fat absorption.
3. Cryptosporidiosis:
While it infects the small intestine, it typically causes acute watery diarrhea due to secretory and osmotic mechanisms rather than chronic steatorrhea and lipid malabsorption.
Step 3: Final Answer:
Giardiosis is characterized by mucosal coverage and bile salt deconjugation in the small intestine, directly leading to fat malabsorption and fat-soluble vitamin deficiencies.
Therefore, the correct answer is option (B).
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