Fig. 2.

Urinary oxalate excretion of healthy subjects on oxalate- and calcium-controlled diets: constellations of 39 individuals (19 male, 20 female, 22–43 yr old) from 4 previously published dietary-controlled studies in our laboratory (28, 32, 33, 35). Dotted line represents line of best fit for 1,000-mg calcium diets (■) and 50- to 750-mg dietary oxalate intake. Urinary oxalate excretion increases 2.7 mg for every 100 mg of dietary oxalate ingested. At 250 mg of oxalate intake, data points demonstrate urinary oxalate excretion at 400 mg of calcium in Oxalobacter formigenes-colonized (○) and -noncolonized (∆) individuals. □, Urinary oxalate excretion of individuals on an oxalate-free formula diet (21). Values are means (SD).