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American Journal of Clinical Nutrition, Vol 68, 1347S-1353S, Copyright © 1998 by The American Society for Clinical Nutrition, Inc

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Effects of soy protein on renal function and proteinuria in patients with type 2 diabetes

JW Anderson, JE Blake, J Turner and BM Smith
Metabolic Research Group, VA Medical Center and University of Kentucky, Lexington, USA. jwandersmd@aol.com

For > 150 y, clinicians and investigators have observed that high protein intakes accelerate the progression of renal disease and that low protein intakes have beneficial effects. Some studies suggest that the effects of soy-protein intake resemble those of a low-protein diet. The Brenner hypothesis suggests that high protein intakes by diabetic individuals create hyperfiltration and glomerular hypertension eventuating in renal damage. On the basis of the available evidence, we are proposing the soy-protein hypothesis, which states that substituting soy protein for animal protein in diabetes patients results in less hyperfiltration and glomerular hypertension and, therefore, resultant protection from diabetic nephropathy. Furthermore, substituting soy protein for animal protein should have therapeutic value in diabetic nephropathy with resultant slowing of deterioration of renal function and decreasing proteinuria. The preliminary results of the study of 8 type 2 diabetes patients with obesity, hypertension, and proteinuria are reported. Under the conditions of the study, providing soy protein as half of the daily protein intake had no distinct effects on renal function or proteinuria in these subjects. Soy-protein intake was associated with a significant reduction in serum cholesterol and triacylglycerol concentrations. Further studies are required to critically examine the effects of soy-protein intake on the renal function of diabetes patients.


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