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Korean J Intern Med > Volume 12(2); 1997 > Article
Park, Jung, Yang, Kim, Kim, Park, and Hong: Protein Intake and the Nutritional Status in Patients with Pre-dialysis Chronic Renal Failure on Unrestircted Diet



Malnutrition is known to be highly associated with morbidity and mortality in dialysis patients. Malnutrition may begin to develop in patients with chronic renal failure(CRF) before they need dialysis. In this study, the nutritional status of patients with moderate to severe CRF on unrestricted diet was evaluated.


We measured dietary protein intake(DPI, g/kg/day) in 64 patients with CRF and 42 normal controls(N). Nutritional indices such as serum albumin(SA, g/dl), transferrin(TF, mg/dl), prealbumin(PA, mg/dl) and insulin-like growth factor-1 (IGF-1, ng/ml) were measured to evaluate the visceral proteins, and creatinine-height index(C–H, g/d/m) to evaluate the somatic proteins.


Mean DPI was 0.80±0.27(S.D.) in CRF and 1.07±0.30 in N(p<0.0001). DPI was lower than 0.6 in 15 CRF patients(23%). Serum albumin, transferrin and C–H were significantly lower in CRF patients than in N(p<0.01). In patients with CRF, nutritional indices were significantly worse with lower DPI(<0.6g/kg/d, n=15) than higher DPI(>0.6g/kg/d, n=49)(SA 2.9±0.7 vs. 3.6±0.8, p<0.005; TF 147(134–179) vs. 220(182–264), p<0.0005; PA 24±8 vs. 32±9, p<0.001; IGF-1 123(66–261) vs. 226(140–344), p<0.05; C–H 0.52±0.15 vs. 0.87±0.23, p<0.0001). CRF patients with nephrotic range proteinuria(>3.5g/d, n=19) had lower SA (2.8±0.6 vs. 3.8±0.8, p<0.0001) and PA(27±9 vs. 32±9, p<0.05). CRF patients with diabetes mellitus(n=20) showed worse nutrition than non-diabetic patients (SA 2.8±0.6g/dl vs. 3.8±0.8g/dl, p<0.0001; TF 176mg/dl(148–214) vs. 220mg/dl(175–266), p<0.05; PA 24±10mg/dl vs. 33±8mg/dl, p<0.0005; IGF-1 138ng/ml(69–269) vs 231ng/ml(140–364), p<0.05; C–H 0.66±0.23 vs. 0.85±0.5, p<0.005).


A significant protein malnutrition prevails in patients with predialysis CRF on unrestricted diet, especially with low protein intake. The effort to detect and correct malnutrition should be made in patients with CRF even before initiation of maintenance dialysis.


Recent studies have shown that malnutrition is an important risk factor for the development of morbidity and mortality in patients on maintenance dialysis14). Malnutrition is known to be associated with more frequent infection or cardiovascular disease which are the major causes of death in these patients58). A significant proportion of patients on maintenance dialysis have been demonstrated to have malnutrition as measured by anthropometric measurements or biochemical parameters911), but they might have begun to suffer from malnutrition even before the institution of dialysis. The evidence for malnutrition was reported to be present in patients who are commencing maintenance dialysis therapy12). Detection and appropriate management of nutritional problems seems to be required even before the initiation of maintenance dialysis.
There are not sufficient data about the nutritional status of patients with pre-dialysis chronic renal failure. Protein and calorie intake were reported to be low in a study13) of a small number of patients with early renal failure. In the report of the Modification of Diet in Renal Disease Study14), it was concluded that patients with chronic renal insufficiency who are not in need of maintenance dialysis therapy, in general, do not suffer from protein calorie malnutrition. However, patients with advanced malnutrition were excluded from the study and the prevalence of malnutrition seems to be underestimated.
In this study, we measured the amount of protein intake of 64 patients with moderate to severe renal insufficiency who were clinically stable and had been on an unrestricted diet, and evaluated various nutritional indices in relation to protein intake, degree of renal insufficiency, amount of proteinuria and underlying renal disease.


1. Subjects

Sixty four consecutive adult patients(46 men and 18 women, mean age 53±14(SD) years) with pre-dialysis chronic renal failure(creatinine clearance less than 60ml/min) who visited the nephrology clinic of Asan Medical Center and 42 healthy subjects (24 men and 18 women, mean age 45±14(SD) years) as control were included. Twenty patients were diabetics(non-insulin dependent) and 19 patients had nephrotic range proteinuria(>3.5g/day). All patients had been on an unrestricted calorie and protein intake.

2. Methods

Serum albumin, transferrin, prealbumin and insulin-like growth factor I(IGF-1) were measured to evaluate the visceral proteins, and creatinine-height(C–H) index to evaluate the somatic proteins.
Serum albumin was measured by bromocresol green method using Hitachi 735–40 autoanalyser (Hitachi Ltd. Tokyo, Japan). Transferrin and prealbumin were measured by nephelometeric immunoassay with Beckman Array System (Beckman Instrument, CA, USA) and Behring nephelometer 100 analyser(Behring wake AG Diagnostica, Malburg, Germany). IGF-1 was measured by two site immunoradiometric assay using commerical kit(DSL-5600, ActiveTM IGF-1-coated tube IRMA, Diagnostic system laboratory Inc, Texas, USA). Total CO2 was measured by ion selective electrode.
Twenty-four-hour urine urea nitrogen was measured by enzyme method(NADH-NAD) with Hitachi 736–40 autoanalyser and 24hr urine protein by trichloroacetic method with spectrophotometer (Shimadgu CL-750, Japan).
Body mass index(BMI) was calculated by dividing the weight, in kilograms, by the square of the height, in meters. Dietary protein intake(DPI, g/kg/day) and C–H index(g/d/m) were calculated from the 24hr urine nitrogen and creatinine excretion using the following formula15, 16).
DPI=6.25×(24hr urinary nitrogen+0.031g/kg×body weight)/Ideal body weightC–H index=actual24hr urinary creatinine excretion/normal value for height and sex
The degree of renal insufficiency was defined as follows: moderate renal insufficiency; Ccr 25–60ml/min, severe renal failure; Ccr less than 25ml/min. The amount of protein intake in CRF patients was divided into two groups: lower protein intake; <0.6g/kg/day, higher protein intake; >0.6g/kg/day. Various nutritional indices were compared in relation to protein intake, degree of renal insufficiency, amount of proteinuria and underlying renal disease. The correlations between DPI or creatinine clearance and nutritional parameters were also analysed.

3. Statistical Analysis

DPI, serum albumin, prealbumin and C–H index are presented as mean with standard deviation. Transferrin and IGF-1 are presented as median with interquartile range. Comparisons of value between two groups were performed by unpaired t-test or Mann-Whitney U test as appropriately. The correlation between DPI or creatinine clearance and nutritional parameters was calculated using Spearman’s rank correlation test. The statistical significance was defined as p<0.05.


Mean DPI was significantly lower in chronic renal failure(CRF) patients(n=64, 0.80±0.27g/kg/day) compared with normal subjects(n=42, 1.07±0.30g/kg/day)(p<0.0001). Fifteen(23%) CRF patients had DPI lower than 0.6g/kg/day. Mean serum albumin(3.5±0.8g/dl), C–H index(0.79±0.26g/d/m) and median value of transferrin[207mg/dl(157–245)] were also significantly lower in CRF patients compared with normal subjects[4.5±0.4g/dl, p<0.0001; 1.03±0.22g/d/m, p<0.0001; 292mg/dl(258–316), p<0.0001], (Table 1) Thirty(47%) CRF patients had serum albumin level lower than 3.5g/dl.
Patients with moderate CRF(n=17) had less protein intake (0.88±0.29g/kg/day) than normal subjects(p<0.05). Serum albumin(3.9±0.8g/dl, p<0.001), transferrin[243mg/dl(158–277), p<0.005] and C–H index (0.91±0.20g/d/m, p<0.05) were also lower in these patients than in normal subjects.
CRF patients with nephrotic range proteinuria(>3.5g/d, n=19) had lower serum albumin(2.8±0.6g/dl vs. 3.8±0.8g/dl, p<0.001) and prealbumin (27±9mg/dl vs. 32.9mg/dl, p<0.05) than those with proteinuria less than nephrotic range(Table 2).
CRF patients with lower DPI(n=15, <0.6g/kg/d) showed significantly worse nutritional indices than patients with higher DPI(n=49, >0.6g/kg/d) [serum albumin 2.9±0.7g/dl vs. 3.6±0.8g/dl, p<0.005; transferrin 147mg/dl(134–179) vs. 220mg/dl(182–264), p<0.0005; prealbumin 24±8mg/dl vs. 32±9mg/dl, p<0.001; IGF-1 123ng/ml(66–261) vs. 226ng/mg(140–344), p<0.05; C–H index 0.52±0.15g/d/m vs. 0.87±0.23g/d/m, p<0.0001] although there was no significant difference in the amount of proteinuria between the two groups(3.3±2.5g/day vs. 3.0±3.0g/day) (Table 3).
Diabetic patients(n=20) had worse nutrition than non-diabetic patients[serum albumin 2.8±0.6g/dl vs. 3.8±0.8g/dl, p<0.0001; transferrin 176mg/dl(148–214) vs. 220mg/dl(175–266), p<0.05; prealbumin 24±10mg/dl vs. 33±8mg/dl, p<0.0005; IGF-1 138ng/ml(69–269) vs. 231ng/ml(140–364), p<0.005).
Diabetic patients had more severe proteinuria (5.1±3.2g/day vs. 2.1±2.2g/day, p<0.0001) and less intake of dietary protein (0.70±0.16g/kg/day vs. 0.85±0.31g/kg/day, p<0.05) than non-diabetic patients(Table 4).
In the analysis of correlation, DPI was significantly related with serum albumin(r=0.52, p<0.0001), transferrin(r=0.51, p<0.0001), prealbumin(r=0.55, p<0.0001), IGF-1(r=0.40, p<0.005) and C–H index(r=0.67, p<0.0001) in CRF patients(Table 5). DPI(r=0.44, p<0.0005), serum albumin(r=0.39, p<0.005), prealbumin(r=0.30, p<0.05), transferrin(n=0.27, p<0.05) and C–H index(r=0.51, p<0.0001) were positively correlated with creatinine clearance in CRF patients, but IGF-1 were not.


The results of the present study reveal that a high proportion of patients with pre-dialysis chronic renal failure on unrestricted diet take low protein and have worse nutritional indices.
The finding of this study is quite different from the previous observation14) that patients with chronic renal insufficiency who were not on maintenance dialysis do not develop protein calorie malnutrition. This discrepancy may be due to the different inclusion criteria considering that patients with advanced malnutrition were excluded from participation in the previous study. Our result shows that patients with chronic renal insufficiency tend to reduce protein intake if they are left on an unmodified diet. This tendency was observed even in patients with moderate renal insufficiency and was definite in patients with severe renal failure. This is also consistent with the report of Guarnieri et al13) that protein intake was reduced in 8 patients with early renal failure on an unrestricted diet.
Low protein intake was associated with significant worsening of various nutritional indices in this study. Protein restriction has been the main focus of recent studies in the nutritional management of chronic renal failure since there was substantial evidence that low protein diet may slow the rate of progression of renal falilure in patients with moderate chronic renal insufficiency1722). The protein requirement in pre-dialysis patients with chronic renal failure was suggested to be 0.55 to 0.60g/kg/day with about two-thirds of the protein being of high biologic value23). One concern about prolonged protein restriction was that it may cause protein malnutrition. Some reported that prolonged protein restriction was associated with change in several indices of nutrition such as fail in serum protein, urea, phoshorus and reduction of muscle mass13,14,24,25). Others reported that low protein diet did not cause protein malnutrition or could prevent and correct malnutrition rather than cause it17,2629).
The recent report of the Modification of Diet in Renal Disease Study30) of a large number of patients with chronic renal insuffciency demonstrated only a small difference between the diet groups in changes in weight and serum concentrations of albumin, transferrin and cholesterol. In view of these results, the deficient protein intake might have contributed in part to the worse nutritional indices in the patient group with low protein intake, but the impact does not seem to be great. On the other hand, low protein intake may reflect the inadequate total nutritional intake. Although the calorie intake was not calculated in our patients, previous reports13,14) that patients with lower glomerular filtration rate tended to have lower energy intake support this possibility.
Patients with nephrotic proteinuria also had worse nutritional indices despite similar dietary protein intake and creatinine clearance compared with those who had mild proteinuria. In contrast to dietary protein intake, however, heavy proteinuria was accompanied by reduction in serum albumin and prealbumin only. The correlation of nutritional indices was also less prominent with the amount of proteinuria than with dietary protein intake. These findings suggest that reduced dietary intake may have a more important role in causing nutritional deficit in these patients than the amount of proteinuria.
Diabetic pateints had worse nutritional indices with less protein intake than non-diabetic patients. This may be in part due to the inclusion of patients with more advanced renal failure. In addition, the heavy proteinuria is known to persist until the renal insufficiency progresses to end-stage. Diabetic patients in this study also had more severe proteinuria. Anorexia and other symptoms caused by diabetic gastroenteropathy can reduce their oral intake, too. These factors also could contribute to their poor nutrition.
Malnutrition is known to be associated with increased morbidity and mortality in dialysis patients. Our results demonstrate that nutritional problems begin to develop even in the stage of moderate renal insufficiency and become significant before initiation of dialysis therapy if appropriate intervention to prevent malnutrition is not done. Malnutrition developed before maintenance dialysis may have an adverse effect on the morbidity and mortality of dialysis patients.
Nutritional indices which can detect even an early change are needed for appropriate intervention of malnutrition. However, it has some limitations in applying the currently available indices in the assessment of the nutritional status of patients with chronic renal failure. Traditionally well known anthrophometric measurements have some flaws in detecting the early malnutrition in patients who are not at their estimated dry weight12). Therefore, C–H index or biochemical parameters may be more useful and easy in assessing the nutritional status, especially in edematous patients. Serum albumin level has been regarded as a good nutritional indicator in persons with normal kidney, but is also affected by renal disease in CRF patients, thus making the interpretation of it difficult. Due to the relatively long half-life and the vast capacity of the liver to synthesize it, the level of serum albumin responds slowly to nutritional changes31). As tools for early detection of malnutrition, many kinds of nutritional markers have been suggested. Recently, prealbumin level was suggested as a sensitive marker for early malnutrition in hemodialysis patients32). However, its usefulness to detect the malnutrition in pre-dialysis condition was not widely studied. Prealbumin is metabolized and excreted by the kidney12). Therefore, the level of prealbumin might be influenced by the renal function. Serum transferrin level is also used as a tool for early detection of malnutrition33), but it can be affected by iron status. IGF-1 has been shown to be a good indicator of malnutrition in hemodialysis patients34), but may also be influenced by the renal function34,35) C–H index has been used as an indicator of muscle mass36). The interpretation of C–H index is somewhat complicated in severe renal failure in view of the fact that creatinine degradation tends to rise when serum creatinine level is above 10mg/dl37). For now, no single index can correctly represent the nutritional status of patients with chronic renal failure, and serial monitoring of several nutritional parameters is needed for better detection of malnutrition.
In conclusion, a high proportion of patients with pre-dialysis chronic renal failure seems to have nutritional problems, as assessed by anthropometric and biochemical nutritional indices when they are left on an unmodified diet. Malnutrition may have an adverse effect on morbidity and mortality in the long run. The effort to detect and correct malnutrition should be made in patients with chronic renal failure even before initiation of maintenance dialysis.

Table 1.
Nutritional Indices of Patients with Chronic Renal Failure and Normal Subjects
CRF patients (n=64) Normal subjects (n=42) p value
DPI(g/kg/day) 0.80±0.27 1.07±0.30 <0.0001
Proteinuria(g/day) 3.0±2.9 0.1±0.1 <0.0001
Total CO2(mEq/L) 20±4 24±2 <0.0001
Albumin(g/dl) 3.5±0.8 4.5±0.4 <0.0001
Transferrin(mg/dl) 207(157–245) 292(258–316) <0.0001
Prealbumin(mg/dl) 30±9 29±7 NS
IGF-1 (ng/ml) 190(123–338) 216(151–325) NS
C–H index(g/d/m) 0.79±0.26 1.03±0.22 <0.0001

Abbreviation: BMI, body mass index; DPI, dietary protein intake; IGF-1, insulin-like growth factor-1; C–H index, creatinine-height index

Table 2.
Nutritional Indices of Patients with Chronic Renal Failure: Nephrotic vs Non-nephrotic
Nephrotic Proteinuria (n=19) Non-Nephrotic proteinuria (n=45) p value
Proteinuria(g/day) 6.8±2.4 1.5±1.0
Ccr(ml/min) 17±7 20±11 NS
DPICg/kg/day) 0.77±0.18 0.82±0.31 NS
Total CO2(mEq/L) 21±3 20±4 NS
BMI(kg/m2) 23±3 23±3 NS
Albumin(g/dl) 2.8±0.6 3.8±0.8 <0.0001
Transferrin(mg/dl) 184(149–220) 217(162–264) 0.07
Prealbumin(mg/dl) 27±9 32±9 <0.05
IGF-1(ng/ml) 190(93–313) 192(129–446) NS
C–H index(g/d/m) 0.77±0.24 0.80±0.27 NS
Table 3.
Nutritional Indices of Patients with Chronic Renal Failure According to Dietary Protein Intake
Lower DPI (<0.6g/kg/d) (n=15) Higher DPI (>0.6g/kg/d) (n=49) p value
DPI(g/kg/day) 0.50±0.10 0.90±0.24
DM/NonDM 6/9 14/35 NS
Ccr(ml/min) 15±11 21±10 0.06
Proteinuria(g/day) 3.3±2.5 3.0±3.0 NS
Total CO2(mEq/L) 20±4 20±4 NS
BMI(kg/m2) 20±2 23±3 <0.0001
Albumin(g/dl) 2.9±0.7 3.6±0.8 <0.005
Transferrin(mg/dl) 147(134–179) 220(182–264) <0.0005
Prealbumin(mg/dl) 24±8 32±9 <0.001
IGF-1(ng/ml) 123(66–261) 226(140–344) <0.05
C–H index(g/d/m) 0.52±0.15 0.87±0.23 <0.0001
Table 4.
Nutritional Indices of Patients with Chronic Renal Failure: Diabetic vs Non-diabetic
Diabetic (n=20) Non-diabetic (n=44) p value
Ccr(ml/min) 14±8 21±11 <0.05
DPI(g/kg/day) 0.70±0.16 0.85±0.31 <0.05
Proteinuria(g/day) 5.1±3.2 2.1±2.2 <0.0001
Total CO2(mEq/L) 21±3 19±4 NS
BMI(kg/m2) 21±3 23±3 <0.05
Albumin(g/dl) 2.8±0.6 3.8±0.8 <0.0001
Transferrin(mg/dl) 176(148–214) 220(175–266) <0.05
Prealbumin(mg/dl) 24±10 33±8 <0.0005
IGF-1(ng/ml) 138(69–269) 231(140–364) <0.05
C–H index(g/d/m) 0.66±0.23 0.85±0.25 <0.005
Table 5.
Correlation Coefficients between Nutritional Indices and Parameters of Patients with Chronic Renal Failure(rs and p value are presented)
BMI 0.32 0.31 0.35 0.49
<0.05 <0.05 <0.01 <0.0001
DPI 0.52 0.51 0.55 0.40 0.67
<0.0001 <0.0001 <0.0001 <0.005 <0.0001
Ccr 0.39 0.27 0.29 0.51
<0.005 <0.05 <0.05 <0.0001
Proteinuria −0.68 −0.40 −0.30
<0.0001 <0.005 <0.05
Total CO2
SA 0.68 0.65 0.44 0.49
<0.0001 <0.0001 <0.0005 <0.0001
TF 0.56 0.45 0.37
<0.0001 <0.0005 <0.005
PA 0.48 0.53
<0.0005 <0.0001
IGF-1 0.29

Abbreviation: SA, serum albumin; TF, transferrin; PA, prealbumin; IGF-1, insulin-like growth factor-1; C–H, creatinine-height index; BMI, body mass index; DPI, dietary protein intake; Ccr, creatinine clearance


1. Lowrie EG, Lew NL. Death risk in hemodialysis patients: The predictive value of commonly measured variables and an evaluation of death rate differences between facilities. Am J Kidney Dis 1990;15:458–482.
crossref pmid
2. Iseki K, Kawazoe N, Fukiyama K. Serum albumin is a strong predictor of death in chronic dialysis patients. Kidney Int 1993;44:115–119.
crossref pmid
3. Goldwasser P, Mittman N, Antignani A, Burrell D, Michel MA, Collier J, Avram MM. Predictors of mortality in hemodialysis patients. J Am Soc Nephrol 1993;3:1613–1622.
4. Owen WF Jr, Lew NL, Liu Y, Lowrie EG, Lazarus JM. The urea reduction ratio and serum albumin concentration as predictors of mortality in patients undergoing hemodialysis. N Engl J Med 1993;329:1001–1006.
crossref pmid
5. Acchiardo SR, Moore LW, Latour PA. Malnutrition as the main factor in morbidity and mortality of hemodialysis patients. Kindey Int 1983;24:S199–203.

6. Keane WF, Collins AJ. Influence of co-morbidity on mortality and morbidity in patients treated with hemodialysis. Am J Kidney Dis 1994;24:1010–1018.
crossref pmid
7. Degoulet P, Legrain M, Reach I. Mortality risk factors in patients treated by chronic hemodialysis: Report of the Daiphane Collaboratory Study. Nephron 1982;31:103–110.
crossref pmid
8. Foley RN, Parfrey PS, Harnett JD, Kent GM, Murray DC, Barre PE. Hypoalbuminemia: a major risk factor for cardiac disease in ESRD[abstract]. J Am Soc Nephrol 1995;6:529.
9. Hakim RM, Levin N. Malnutrition in hemodialysis patients. Am J Kidney Dis 1993;21:125–137.
crossref pmid
10. Avram MM, Mittman N. Malnutrition in uremia. Sem Nephrol 1994;14:238–244.

11. Bergstrom J. Why are dialysis patients malnourished? Am J Kidney Dis 1995;26:229–241.
crossref pmid
12. Blumenkrantz MJ, Kopple JD, Gutman RA, et al. Methods for assessing nutritional status of patients with renal failure. Am J Clin Nutr 1980;33:1567–1585.
crossref pmid
13. Guanieri GF, Toigo G, Situlin R, Carrara M, Tamaro G, Lucchesli A, Oldrizzi L, Rugiu C, Maschio G. Nutritional state in patients on long-term low-protein diet or with nephrotic syndrome. Kidney Int 1989;36(Suppl 27):S195–S200.
14. Modification of Diet in Renal Disease Study Group. (Prepared by Kopple JD, Berg RB, Honser H, Steinman T, Teschan P). Nutritional status of patients with different level of chronic renal insufficiency. Kidney Int 1989;36(Suppl 27):S184–S194.

15. Maroni BJ, Steinman TI, Mitch WE. A method for estimating nitrogen intake of patients with chronic renal failure. Kidney Int 1985;27:58–65.
crossref pmid
16. Blackburn GL, Bistrian BR, Maini BS, Schlamm HT, Smith MF. Nutritional and metabolic assessment of the hospitalized patient. J Parent Ent Nutr 1977;1:11–22.
17. Walser M. Does prolonged protein restriction preceding dialysis lead to protein malnutrition at the onset of dialysis? Kidney Int 1993;44:1139–1144.
crossref pmid
18. Walser M, Hill SB, Wend L, Magder L. A crossover comparison of progression of chronic renal failure: Ketoacid versus aminoacids. Kidney Int 1993;43:933–939.
crossref pmid
19. Ihle BU, Becker GJ, Whitworth JA, Charlwood RA, Kincaid-Smith PS. The effect of protein restriction on the progression of renal insufficiency. N Engl J Med 1989;321:1773–1777.
crossref pmid
20. Zeller K, Whittaker E, Sullivan L, Raskin P, Jacobson H. Effect of restricting dietary protein on the progression of renal failure in patients with insulin dependent diabetes mellitus. N Engl J Med 1991;324:78–84.
crossref pmid
21. Modification of Diet in Renal Disease Study Group. The modification of diet in renal disease study. Design, methods and results from the feasibility study. Am J Kidney Dis 1992;20:18–33.
22. Rosman JB, Langer K, Brandl M, Piers-Becht TPM, Hem GK, Ter Wee PM, Donker AJM. Protein-restricted diets in chronic renal failure: A four year follow-up shows limited indications. Kidney Int 1989;36(Suppl 27):S96–S102.
23. Kopple JD, Coburn JW. Metabolic studies of low protein diets in uremia: I. Nitrogen and potassium. Medicine 1973;52:583–595.
crossref pmid
24. Lucas PA, Meadows JH, Robert DE, Coles GA. The risks and benefits of a low protein-essential amino acid-keto acid diet. Kidney Int 1986;29:995–1003.
crossref pmid
25. Rosman JB, TerWee PM, Meijer S, Piers-Becht TP, Sluiter WJ. Prospective randomized study of early protein restriction in chronic renal failure. Lancet 1984;2:1291–1296.
crossref pmid
26. Bergstrom J, Furst P, Noree L-O. Treatment of chronic uremic patients with protein-poor diet and oral supply of essential amino acids. I. Nitrogen balance studies. Clin Nephrol 1975;3:187–194.
27. Noree L-O, Bergstrom J. Treatment of chronic uremic patients with protein-poor diet and oral supply of essential amino acids. II. Clinical results of long-term treatment. Clin Nephrol 1975;3:195–203.
28. Mitch WE, Walser M, Steinman TI, Hill S, Zeger S, Tungsanga K. The effect of a keto acid-amino acid suppliment to a restricted diet on the progression of chronic renal failure. N Engl J Med 1984;311:623–629.
crossref pmid
29. Walser M, LaFrance ND, Ward L, VanDuyn MA. Progression of chronic renal failure in patients given ketoacids following amino acids. Kidney Int 1987;32:123–128.
crossref pmid
30. Klahr S, Levey AS, Beck GJ, Caggiula AW, Hunsicker L, Kusek JW, Striker G. The effect of dietary protein restriction and blood pressure control on the progression of chronic renal disease. N Engl J Med 1994;330:877–884.
crossref pmid
31. Bischel M. Albumin turnover in chronically hemodialized patients. Trans Am Soc Intern Organs 1969;15:298–304.

32. Oksa H, Ahonen K, Pusternack A, Marnela KM. Malnutrition in hemodialysis patients. Scand J Urol Nephrol 1991;25:157–161.
crossref pmid
33. Ooi BS, Darocy AF, Pollak VE. Serum transferrin levels in chronic renal failure. Nephron 1972;9:200–207.
crossref pmid
34. Jacob V, Le Carpentier JE, Salzano S, Naylor V, Wild G, Brown CB, EI Nahas AM. IGF-1, a marker of undernutrition in hemodialysis patients. Am J Clin Nutr 1990;52:39–44.
crossref pmid
35. Baxter RC, Brown AS, Turtle JR. Radioimmunoassay for somatostatin C: Comparison with radioreceptor assay in patients with growth-hormone disorder, hypothyroidism and renal failure. Clin Chem 1982;28:488–495.
36. Walser M. Creatinine excretion as a measure of protein nutrition in adults of varying age. J Parent Enter Nutr 1987;11:73S–78S.
37. Mitch WE, Collier VU, Walser M. Creatinine metablism in chronic renal failure. Clin Sci 1980;58:327–355.
crossref pmid
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