Abstract
Acute effect of the ingestion of 80 g each of casein, lactalbumin, and soybean isolate on serum and urinary uric acid concentrations was investigated in 10 healthy subjects. Serum and urinary uric acid concentrations were measured before and after the ingestion of proteins. Serum uric acid decreased significantly 3 h after ingestion of lactalbumin and casein but increased after soybean consumption. Urate clearance was significantly increased after ingestion of each of the three proteins. Multivariate analysis of urate clearance during lactalbumin and casein loads showed that independent correlation was obtained for serum alanine and urea concentration. These results demonstrate that, in addition to their known uricosuric effect, milk proteins acutely decrease serum uric acid concentration. Analysis of the effects of lactalbumin and casein on urinary uric acid elimination suggests that the uricosuric effect of proteins is a multifactorial phenomenon.
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