A normal-calcium, low-protein, low-salt diet reduced recurrence of renal stones over 5 years.

Patients 120 men (mean age 45 y) who had idiopathic hypercalciuria (urinary calcium excretion > 300 mg/d) on an unrestricted diet, recurrent formation of calcium oxalate stones ( ≥ 2 colic episodes with expulsion of stones or radiographic evidence of retained stones), no known condition commonly associated with calcium nephrolithiasis, no previous visit to a stone disease centre, and no current treatment for prevention of recurrent stones. 103 men (86%) completed the study (13 withdrew, 2 were lost to follow up, and 2 died).