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  • Title: Severe dietary protein restriction in overt diabetic nephropathy: benefits or risks?
    Author: Meloni C, Morosetti M, Suraci C, Pennafina MG, Tozzo C, Taccone-Gallucci M, Casciani CU.
    Journal: J Ren Nutr; 2002 Apr; 12(2):96-101. PubMed ID: 11953922.
    Abstract:
    OBJECTIVE: To evaluate whether restricting protein intake may delay the progression of chronic renal failure caused by overt diabetic nephropathy and also whether this increases the risk of malnutrition. DESIGN: Prospective clinical trial. SETTING: Nephrology outpatients. PATIENTS: Sixty-nine patients (32 affected by type 1 and 37 by type 2 diabetes, all treated with insulin) affected by both overt diabetic nephropathy and hypertension. INTERVENTION: The study was started once hypertension and glycemia had been under control for at least 3 months. Two groups of patients, matched for similar mean glomerular filtration rate value and nutritional status, were studied: a low-protein diet (0.6 g/kg/d) was randomly prescribed to 35 patients, whereas in the other 34 patients a free diet intake was maintained for 12 months. MAIN OUTCOME MEASURE: Renal function and nutritional status. RESULTS: The protein intake was significantly different in the 2 groups of patients, whereas the average decline of glomerular filtration rate during the follow-up was comparable. In the low-protein diet group, serum prealbumin concentration significantly decreased after 9 months, whereas serum albumin decreased at the end of the study. CONCLUSION: Severe dietary protein restriction does not seem to delay the progression of renal disease in patients with overt diabetic nephropathy, whereas it may induce malnutrition.
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