Database	Search terms
CENTRAL	MeSH descriptor Diet Therapy, this term only MeSH descriptor Diet, Protein‐Restricted, this term only (protein*):ti,ab,kw and (diet*):ti,ab,kw in Trials (protein NEAR/2 restrict*):ti,ab,kw in Trials (protein NEAR/2 reduc*):ti,ab,kw in Trials "low protein diet*":ti,ab,kw in Trials (#1 OR #2 OR #3 OR #4 OR #5 OR #6) MeSH descriptor Renal Insufficiency, this term only MeSH descriptor Renal Insufficiency, Chronic explode all trees MeSH descriptor Kidney Diseases, this term only (chronic NEXT kidney):ti,ab,kw or (chronic NEXT renal):ti,ab,kw in Trials (CKF or CKD or CRF or CRD):ti,ab,kw in Trials (predialysis or pre‐dialysis):ti,ab,kw in Trials (#8 OR #9 OR #10 OR #11 OR #12 OR #13) (#7 AND #14)
MEDLINE (OVID SP)	Diet Therapy/ Diet, Protein Restricted/ (protein$ and diet$).tw. protein restrict$.tw. protein reduc$.tw. low protein diet$.tw. or/1‐6 Renal Insufficiency/ exp Renal Insufficiency, Chronic/ Kidney Diseases/ (chronic kidney or chronic renal).tw. (CKF or CKD or CRF or CRD).tw. (predialysis or pre‐dialysis).tw. exp Uremia/ ur$emi$.tw. or/8‐15 and/7,16
EMBASE (OVID SP)	protein restriction/ diet restriction/ (protein$ and diet$).tw. low protein diet$.tw. protein restric$.tw. protein reduc$.tw. or/1‐6 kidney failure/ chronic kidney disease/ (predialysis or pre‐dialysis).tw. (chronic adj kidney) or (chronic adj renal).tw. (CKF or CKD or CRF or CRD).tw. (renal insufficiency or kidney insufficiency).tw. or/8‐13