Why is dietary sodium restriction important in CKD, and what is a typical daily limit?

• A. Only needed in dialysis patients
• B. Increases potassium excretion
• C. No effect; limit 5,000 mg/day
• D. Reduces hypertension and volume overload; limit around 2,000 mg/day

Answer: (D)

Sodium restriction in CKD is used to manage fluid balance and blood pressure. When kidney function declines, the body struggles to excrete sodium, so high sodium intake leads to more fluid in the extracellular space. This increase in volume raises blood pressure and contributes to edema and heart strain. By limiting sodium, you reduce overall fluid volume, help control hypertension, and lessen volume overload, which protects the heart and kidneys and improves symptoms.

A typical daily limit is about 2,000 mg of sodium (2 g) per day, though targets can vary by individual. It’s important to note that sodium restriction isn’t only for dialysis patients and doesn’t work by increasing potassium excretion. The suggestion that there’s no effect or that the limit should be 5,000 mg/day isn’t supported by CKD management guidelines.