Which vegetable is avoided in control stones in the kidney?

Appeared in: MNS 2015

Explanation

Green leafy vegetables, particularly spinach, are known to be very high in oxalates.
High urinary oxalate is a primary risk factor for the formation of calcium oxalate stones, which are the most common type of kidney stones, accounting for about 75% of cases.
Dietary management for patients with a history of calcium oxalate stones involves limiting or avoiding foods with high oxalate content to prevent recurrence.

Option A: Tomatoes contain oxalates, but in moderate amounts, significantly less than vegetables like spinach. They are not typically a primary food to be strictly avoided unless consumed in excessive quantities.
Option B: Cabbage is a low-oxalate vegetable. It is considered a safe and recommended vegetable for individuals prone to kidney stones.
Option C: Beans generally have moderate oxalate levels. While some specific types of beans may be higher in oxalates, as a general category, they are not as consistently high as certain green leafy vegetables.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Dietary management for nephrolithiasis (kidney stones) as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in patient education for secondary prevention of kidney stones. This includes providing clear, practical dietary advice that patients can follow long-term.
Key teaching points include emphasizing hydration, explaining the role of oxalate, and clarifying misconceptions about calcium intake (i.e., not to restrict dietary calcium).
What if? The patient is diagnosed with uric acid stones instead of calcium oxalate stones. The primary dietary advice would shift to limiting purine-rich foods (e.g., red meat, organ meats, certain seafood) and encouraging urine alkalinization, rather than focusing on oxalates.

How to Approach the Question

First, identify the key concepts in the question: 'vegetable to be avoided' and 'kidney stones'.
Recall that the most common type of kidney stone is calcium oxalate.
Understand that the formation of these stones is linked to high levels of oxalate in the diet.
Evaluate the given options based on their general oxalate content.
Compare the options: Green leafy vegetables (like spinach) are famously high in oxalate, while tomatoes and beans are moderate, and cabbage is low.
Conclude that the food group most critical to avoid is the one with the highest oxalate content.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 pp. 356-358, 353-355

Practise the full MNS 2015

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