Fish bones are excellent source of

RRB Staff Nurse Jaipur-6th June 2018

Applied Nutrition & Dietetics

Medium

Appeared in: RRB Staff Nurse Jaipur-6th June 2018

Explanation

Fish bones are primarily composed of calcium phosphate in a crystalline structure called hydroxyapatite, making them a rich source of both calcium and phosphorus.
Fish, especially those from marine environments, accumulate fluoride from the water, which is then deposited into their skeletal tissues.
Consuming edible fish bones (e.g., in sardines or canned salmon) provides a combination of all three minerals: calcium for bone structure, phosphorus for energy and bone health, and fluoride for preventing dental caries.
Therefore, the most complete and accurate answer is the one that includes all three key minerals.

Option A: This option is incomplete. While fish bones are a source of fluoride, they are an even more significant source of calcium and phosphorus, which are the primary structural components of bone.
Option B: This is an incomplete answer. Phosphorus is a major component of bone, but it is present along with calcium. Fish bones are an excellent source of both, as well as fluoride.
Option C: This is an incomplete answer. Calcium is the most abundant mineral in bone, but fish bones are also an excellent source of phosphorus and contain fluoride.

Visual 1: Infographic - A diagram illustrating the mineral composition of bone, highlighting the hydroxyapatite crystal structure (made of calcium and phosphate) and showing where fluoride ions can be incorporated.
Visual 2: Chart - A bar chart comparing the mineral content (Calcium, Phosphorus, Fluoride) in different food sources, with a bar for edible fish bones (e.g., from canned sardines) demonstrating high levels of all three.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional composition of fish bones as background academic context rather than a clinical decision trigger.
Nurses can advise patients, especially those at risk for osteoporosis or with increased mineral needs (e.g., pregnant or lactating women), that consuming small, edible fish with bones is an excellent natural way to boost their intake of bone-building minerals.
This dietary advice is a practical, food-based approach to support bone and dental health, complementing or sometimes reducing the need for supplements.
What if? If a patient has chronic kidney disease, a nurse would advise caution. The high phosphorus content in fish bones can be harmful, as diseased kidneys cannot effectively excrete excess phosphorus, leading to a dangerous condition called hyperphosphatemia.

How to Approach the Question

Step 1: Identify the core of the question, which is the nutritional value of 'fish bones'.
Step 2: Recall the fundamental composition of bone tissue. Bones are primarily a matrix of calcium and phosphate (as hydroxyapatite). This immediately suggests that options C and B are correct, but possibly incomplete.
Step 3: Consider the specific source: 'fish'. Recall or deduce that aquatic life, especially from the ocean, is a known source of certain elements like iodine and fluoride.
Step 4: Evaluate the options based on this combined knowledge. Options A, B, and C are all individually present in fish bones. However, a good source implies significant amounts.
Step 5: Select the most comprehensive and accurate option. Since fish bones are structurally made of calcium and phosphorus and also incorporate fluoride from their environment, the option listing all three is the most complete and therefore the best answer.

Concept Tested & Keywords

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