Nutrition in Kidney Disease
Nutrition in Kidney Disease - Dietary sodium, protein, potassium, phosphate, fluids and protein-energy wasting in CKD and ESRD.
Practical orientation: Nutrition recommendations should be individualized by CKD stage, potassium, phosphate, protein-energy wasting and dialysis status.
Use first: clinical summary and algorithm.
Then: differential diagnosis, workup and management tables.
Escalate: use red flags and biopsy/urgent-care sections.
Clinical summary
Sodium
Restrict in CKD, hypertension, edema and proteinuria; high sodium blunts RAAS blockade.
Protein
Nondialysis CKD often targets about 0.8 g/kg/day; dialysis requires higher intake.
Potassium
Individualize by eGFR, serum K and medications.
Phosphate
Limit additives and high-bioavailability sources; use binders when needed.
Fluids
Usually unrestricted in nondialysis CKD unless hyponatremic or overloaded; restrict in dialysis as needed.
Recommended intake framework
| Nutrient | CKD / ESRD approach |
|---|---|
| Sodium | Usually <2 g/day sodium for CKD and volume/BP control. |
| Potassium | Tailor; often no restriction in CKD 1-3 unless hyperkalemia risk. Dialysis targets depend on modality and labs. |
| Protein | Nondialysis CKD 3-5: around 0.8 g/kg/day; HD/PD: about 1.2 g/kg/day. |
| Calcium | Avoid excessive elemental calcium load. |
| Phosphate | Restrict dietary phosphate; processed foods and animal sources have higher bioavailability than plant sources. |
| Fluids | Nondialysis: no routine restriction; HD/PD: individualized, often 1-1.5 L/day plus urine output. |
| Calories | Often 30-35 kcal/kg/day depending age, catabolic state and dialysis. |
Sodium
High sodium intake worsens hypertension, edema and proteinuria and antagonizes ACEi/ARB antiproteinuric effects. Sodium restriction can meaningfully improve BP and proteinuria.
Protein
| Setting | Practical approach |
|---|---|
| Nondialysis CKD | Moderate restriction may reduce hyperfiltration and metabolic burden. Avoid malnutrition. |
| Nephrotic syndrome | Avoid excessive protein intake; replace losses cautiously. |
| Dialysis | Higher protein intake is needed to prevent protein-energy wasting. |
Potassium
High-potassium diets may benefit BP in the general population, but CKD patients need individualized advice based on serum potassium, eGFR, RAAS blockade, acidosis, constipation and dialysis modality.
Protein-energy wasting
Protein-energy wasting is a syndrome of malnutrition, muscle loss and inflammation in advanced CKD. It is associated with hospitalization and mortality.
| Clue | Examples |
|---|---|
| Anthropometric | Low BMI, unintentional weight loss, low body fat or muscle loss. |
| Biochemical | Low albumin, low prealbumin, low cholesterol. |
| Functional | Weakness, poor intake, frailty. |
| Management | Dietitian involvement, treat acidosis/inflammation, adjust dialysis adequacy and address symptoms limiting intake. |