How much protein does a client with chronic kidney disease need?

The numbers by stage

These recommendations apply to clinically appropriate, metabolically stable adults. Acute illness, hospitalisation, protein-energy wasting, frailty and other clinical factors may alter protein requirements.

KDIGO advises against prescribing low- or very-low-protein diets to metabolically unstable people with CKD.

Supplemented very-low-protein diets (with ketoacid analogues) are a specialist option requiring close clinical supervision.

Protein requirements generally increase once maintenance dialysis begins, reflecting amino acid losses and the catabolic effects associated with dialysis treatment. A client's protein prescription should therefore be reassessed when dialysis is initiated.

Why the two guidelines disagree

KDOQI 2020 recommends greater protein restriction for some metabolically stable adults with CKD 3–5, provided this is delivered under close clinical supervision.

KDIGO 2024 recommends maintaining protein intake around 0.8 g/kg/day for most adults with CKD G3–G5, while allowing supervised very-low-protein diets as an option for selected people who are willing and able to follow them and are at risk of kidney failure.

The recommendations reflect differences in how the guideline groups interpreted the evidence and balanced potential effects on CKD progression against adherence, nutritional adequacy and the risk of undernutrition.

Follow the guideline and individualised prescription used by the client's renal team rather than selecting a lower protein target independently.

Which body weight to use

The body weight used for renal protein prescriptions varies between guidelines and clinical services, particularly in people with obesity or at extremes of body size.

Some services use ideal, adjusted or standard body weight rather than actual weight. Follow the method specified by the renal guideline or service you are working with rather than applying one adjustment formula universally. Ideal and adjusted body weight shows the sums.

Take a 68-year-old man with CKD stage 3b and type 2 diabetes. He is 175 cm tall and weighs 92 kg.

Robinson IBW = 52 + (1.9 × (175 − 152.4) ÷ 2.54) = 68.9 kg
AdjBW (illustrative example using a 0.25 correction factor):
  68.9 + 0.25 × (92 − 68.9) = 74.7 kg

KDOQI, with diabetes, on AdjBW: 74.7 × 0.6 to 0.8 = 45 to 60 g
KDIGO, on AdjBW:                74.7 × 0.8        = 60 g
KDIGO, on actual weight:        92 × 0.8          = 74 g

These calculations show how substantially the chosen body-weight method can alter the resulting protein target. They do not establish which target is appropriate for this client.

In practice, the protein prescription and body-weight method should be confirmed with the client's renal team, particularly when a restricted-protein diet is being considered.

Energy, sodium, potassium and phosphorus

• Energy. Adequate energy intake is important when protein is restricted to help maintain nutritional status and reduce the risk of protein-energy wasting. KDOQI recommends approximately 25–35 kcal/kg/day for metabolically stable adults with CKD, individualised according to factors such as age, activity, body composition, weight goals and clinical status.
• Sodium. KDIGO 2024 suggests limiting sodium intake to less than 2 g/day (equivalent to less than 5 g salt/day) for people with CKD, unless individual circumstances require a different approach.
• Potassium. Potassium intake should be individualised rather than routinely restricted in everyone with CKD. Consider serum potassium alongside kidney function, medications, dietary sources and other clinical factors. Where potassium reduction is required, consider highly bioavailable potassium from processed foods and potassium-containing additives while avoiding unnecessary restriction of nutrient-dense plant foods.
• Phosphorus. Where phosphorus restriction is required, consider both the amount and bioavailability of dietary phosphorus. Phosphate additives in processed foods are highly absorbable, whereas phosphorus from many plant foods is less bioavailable. Dietary restriction should be individualised according to biochemical results and the client's overall diet.
• Protein source. Plant-based protein foods can contribute fibre and often contain phosphorus with lower bioavailability than many additive-containing processed foods. KDIGO encourages diets with a greater emphasis on plant-based foods, although KDOQI found insufficient evidence to recommend one specific protein source for people with CKD. Food choices should therefore be individualised within the client's overall renal nutrition plan.

Therapeutic protein, electrolyte and mineral prescriptions for CKD require appropriate renal nutrition expertise. Practitioners working outside this scope can support clients in implementing the plan set by their renal team, monitor adherence and intake within their role, and refer back when there are concerns about appetite, weight, symptoms or the ability to follow the prescribed diet.