Which dietary modification is commonly recommended to reduce the risk of kidney stone formation?

• A. Adequate fluid intake to dilute urine.
• B. Limit calcium-rich foods.
• C. High oxalate foods.
• D. High-sodium diet.

Answer: (A)

The main idea is that diluting urine through adequate fluid intake is a key way to prevent kidney stone formation. When urine is more dilute, the concentration of minerals like calcium, oxalate, and uric acid is lower, so they are less likely to crystallize and form stones. Drinking enough fluids to produce a larger daily urine volume helps flush out small crystals before they grow. Dietary calcium isn’t typically restricted because calcium in the diet can bind oxalate in the gut and reduce oxalate absorption, which can actually lower stone risk for many people. In contrast, high-oxalate foods can increase stone risk by delivering more oxalate to the urine, and a high-sodium diet increases calcium excretion in urine, promoting stone formation.