Osteoporosis occurs due to the deficiency of

RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Medical & Surgical Nursing

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Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Explanation

Osteoporosis is a condition characterized by reduced bone mass and microarchitectural deterioration, leading to increased fracture risk.
Calcium is the primary mineral responsible for bone strength and density. The skeleton stores about 99% of the body's calcium.
A chronic deficiency in calcium intake leads the body to resorb calcium from the bones to maintain essential blood calcium levels, resulting in demineralization and osteoporosis.
After the age of 40, calcium absorption from the gut decreases and its excretion increases, contributing to a negative calcium balance that accelerates bone loss.

Option A: While phosphorus is a key component of bone mineral (hydroxyapatite), isolated dietary deficiency is uncommon and not the primary cause of age-related osteoporosis. The body regulates phosphorus levels effectively.
Option C: Zinc is a trace element that acts as a cofactor for enzymes involved in bone matrix synthesis. However, its deficiency is not considered a primary cause of osteoporosis.
Option D: Iron's primary role is in oxygen transport as a component of hemoglobin. Iron deficiency is a leading cause of anemia, not osteoporosis.

Visual 1: Diagram: Comparison of a healthy bone cross-section versus an osteoporotic bone, highlighting the increased porosity and thinner trabeculae in the latter.
Visual 2: Infographic: Flowchart showing how low dietary calcium and aging lead to increased bone resorption and the development of osteoporosis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathophysiology of Osteoporosis as background academic context rather than a clinical decision trigger.
Nurses are central to preventing osteoporosis through patient education on diet (calcium and vitamin D-rich foods), the importance of weight-bearing exercise, and smoking/alcohol cessation.
For patients diagnosed with osteoporosis, nurses administer medications (like bisphosphonates), educate on side effects, and implement fall prevention strategies to reduce fracture risk.
What if? If the patient was post-menopausal, the answer would still be calcium, but the underlying mechanism would also strongly involve estrogen deficiency, which accelerates bone loss. This is why post-menopausal women are a primary risk group.

How to Approach the Question

Identify the core concept: The question asks for the primary nutritional deficiency that causes osteoporosis.
Recall the basic composition of bone. It is primarily a matrix of collagen mineralized with calcium phosphate crystals.
Evaluate the options based on their role in bone health.
Calcium is the most famous mineral associated with bone strength. Its deficiency is a well-known cause of weak bones.
Phosphorus is also in bone, but deficiency is less common.
Iron is primarily related to blood health (anemia).

Concept Tested & Keywords

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