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Diabetic Kidney Disease Benefits from Intensive Low-Protein Diet: Updated Systematic Review and Meta-analysis.
Qiuling Li1,2, Feng Wen1, Yanhui Wang1,3
1Division of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.
Summary
A low-protein diet (LPD) for diabetic kidney disease (DKD) patients, consuming less than 0.8 g/kg/day, significantly slows kidney function decline and reduces proteinuria. Early-stage CKD patients also see improved glucose and lipid control with LPD.
Area of Science:
- Nephrology
- Endocrinology
- Dietary Science
Background:
- Dietary protein intake (DPI) recommendations for chronic kidney disease (CKD) vary, with 0.6-0.8 g/kg/day often cited for moderate-to-advanced stages.
- The efficacy of low-protein diets (LPD), specifically DPI ≤ 0.8 g/kg/day, in patients with diabetic kidney disease (DKD) across early CKD stages (1-3) remains inconsistently documented.
Purpose of the Study:
- To systematically review and meta-analyze randomized controlled trials (RCTs) investigating the effects of LPD (DPI < 0.8 g/kg/day) versus control diets on DKD progression.
- To assess the impact of LPD on glomerular filtration rate (GFR) decline and proteinuria in DKD patients.
- To evaluate specific benefits of LPD for DKD patients in CKD stages 1-3, including effects on proteinuria, glycated hemoglobin, and lipid profiles.
Main Methods:
- Systematic literature search of MEDLINE, EMBASE, Cochrane Library, and Web of Knowledge for eligible RCTs.
- Inclusion of trials comparing LPD (DPI < 0.8 g/kg/day) with control diets in DKD patients.
- Meta-analysis of data from 9 RCTs involving 506 participants with follow-up periods ranging from 4.5 to 60 months.
Main Results:
- DKD patients on LPD (< 0.8 g/kg/day) showed a significantly reduced decline in GFR (MD 22.31 mL/min/1.73 m², P < 0.01) and decreased proteinuria (SMD -2.26 units, P < 0.001) compared to controls.
- In CKD stages 1-3, LPD led to a marked decrease in proteinuria (SMD -0.96 units, P = 0.03).
- LPD also resulted in significant reductions in glycated hemoglobin (-0.42%) and cholesterol levels (-0.22 mmol/L) in these early-stage DKD patients.
Conclusions:
- A DPI of < 0.8 g/kg/day is strongly associated with slowed GFR decline and reduced proteinuria in DKD patients.
- LPD offers significant benefits for DKD patients in CKD stages 1-3, including substantial proteinuria reduction and improvements in glycemic and lipid control.
- These findings support the use of LPD in managing DKD, particularly in earlier stages of kidney disease.
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