Seven healthy male volunteers were studied to test the effect of timing of an oral protein load on renal function. Creatinine clearance (Ccr) was measured during the 4-h period after administration of 72 g of protein in the form of cooked red meat at 1200 hours (lunch protein load, PL) and at 2000 hours (supper PL) the next evening. A low-protein meal in the form of vegetables was given as a control load at 2000 hours on the first day (supper control load, CL) and at 1200 hours on the second day (lunch CL).
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