Osteoporosis is caused by the deficiency of

KGMU 2024

Applied Nutrition & Dietetics

Easy

Appeared in: KGMU 2024

Explanation

Calcium is the primary mineral responsible for bone mineralization and providing structural strength.
A deficiency in calcium intake forces the body to resorb this mineral from the bones to maintain stable blood calcium levels required for other vital functions.
This chronic process of bone resorption leads to a significant reduction in bone mineral density, making the bones porous, brittle, and susceptible to fractures, which is the hallmark of osteoporosis.

Option A: Iron deficiency primarily causes anemia by impairing hemoglobin synthesis, which affects the oxygen-carrying capacity of blood, not bone structure.
Option C: Zinc is crucial for enzymatic reactions, immune function, and wound healing. While important for overall health, its deficiency does not directly cause osteoporosis.
Option D: While phosphorus is a key component of bone mineral, its deficiency is rare and typically results in osteomalacia (softening of bones due to impaired mineralization) rather than osteoporosis (loss of bone mass).

Visual 1: Diagram: A side-by-side comparison of a cross-section of healthy bone versus osteoporotic bone, clearly showing the larger, more porous spaces in the osteoporotic sample.
Visual 2: Infographic: Illustrating the key dietary sources of calcium, such as dairy products, leafy green vegetables, and fortified foods, to educate on prevention.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional deficiencies and bone health as background academic context rather than a clinical decision trigger.
Nurses are pivotal in educating patients, especially high-risk groups like postmenopausal women and the elderly, on preventing osteoporosis through adequate calcium and Vitamin D intake.
Patient counseling should include dietary recommendations, information on supplementation, and the importance of weight-bearing exercises to stimulate bone density.
What if? If a patient with low bone density also has chronic kidney disease, simple calcium supplementation could be dangerous and lead to vascular calcification. Management would shift to using phosphate binders and activated forms of Vitamin D, requiring close monitoring by the healthcare team.

How to Approach the Question

First, identify the core concept of the question, which is the primary nutritional cause of osteoporosis.
Recall the basic physiology of bone health. Bone is a living tissue primarily composed of a collagen matrix mineralized with calcium phosphate.
Analyze the function of each mineral in the options. Calcium is widely known as the main 'building block' for bones.
Eliminate the other options by considering their primary roles: Iron is for blood (hemoglobin), and Zinc is for immunity and healing.
Differentiate between Calcium and Phosphorus. While both are in bone, calcium deficiency is the classic and direct cause of osteoporosis (loss of mass), whereas phosphorus deficiency is linked to osteomalacia (softening).

Concept Tested & Keywords

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