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Higher Intakes of Fish Protein Are Related to a Lower Risk of Microalbuminuria in Young Swedish Type 1 Diabetic Patients

¹ Department of Clinical Sciences, Paediatrics, Umeå University, Umeå
² Department of Woman and Child Health, Karolinska Institute, Stockholm, Sweden

OBJECTIVE—To examine the influence of dietary intake from various protein and fat sources on the occurrence of microalbuminuria in type 1 diabetic patients.

RESEARCH DESIGN AND METHODS—In this nested case control study, 1,150 patients with diabetes duration >5 years reported dietary habits for the previous 12 months and submitted urinary samples for the analysis of albumin excretion rate (AER). A total of 75 cases of albuminuria (overnight AER 15 µg/min) were identified and compared with 225 duration-matched control subjects.

RESULTS—Neither mean protein, fat intake, average fish protein intake (control subjects 4.56 ± 3.83 g/day and cases 3.82 ± 2.87 g/day; P = 0.12), nor intake of meat and vegetable protein differed between the cases of albuminuria and the control subjects. High consumers of fish protein (greater than the 75th percentile) (12 cases and 63 control subjects, mean intake 9.35 g fish protein/day, i.e., 53 g fish/day) had lower odds ratios (ORs) for microalbuminuria than individuals consuming less fish protein (mean 2.72 g/day) (crude OR 0.49 and 95% CI 0.25–0.97). When adjusted for known confounding factors, such as HbA_1c, mean arterial pressure, diabetes duration, age, sex, smoking, BMI, country region, and total energy, individuals with a high intake of fish protein and fish fat showed a reduction in the risk for microalbuminuria (OR 0.22 and 0.31, respectively; 95% CI 0.09–0.56 and 0.13–0.76, respectively). When fish protein and fat were adjusted for each other, a high intake of fish protein but not of fish fat was still significantly associated with a decrease in the risk for microalbuminuria.

CONCLUSIONS—Total protein and fat intake were not associated with the presence of microalbuminuria, but a diet including a high amount of fish protein seemed to lessen the risk.

Abbreviations: AER, albumin excretion rate • CVD, cardiovascular disease • DN, diabetic nephropathy • GFR, glomerular filtration rate • OR, odds ratio

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