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The Impact of Dietary Calcium and Oxalate Ratios on Stone Risk

草酸盐 草酸钙 排泄 医学 尿钙 内科学 动物科学 肌酐 尿 内分泌学 肾结石 食品科学 化学 生物 无机化学
作者
Jessica N. Lange,Kyle Wood,Patrick W. Mufarrij,Michael F. Callahan,Linda Easter,John Knight,Ross P. Holmes,Dean G. Assimos
出处
期刊:Urology [Elsevier BV]
卷期号:79 (6): 1226-1229 被引量:21
标识
DOI:10.1016/j.urology.2012.01.053
摘要

To determine whether the ratio of dietary calcium and oxalate consumption at mealtime affects gastrointestinal oxalate absorption and urinary oxalate excretion.A study was conducted with 10 non-stone-forming adults placed on controlled diets with daily calcium and oxalate contents of 1000 and 750 mg, respectively. Subjects consumed a balanced calcium/oxalate ratio diet for 1 week, observed a minimum 1-week washout period, and subsequently consumed an imbalanced calcium/oxalate ratio diet for one week. Urine specimens were collected on the last 4 days of each diet. Outcome measures included urinary creatinine, calcium, and oxalate as well as the Tiselius index for assessing urinary calcium oxalate supersaturation.Total daily calcium excretion, oxalate excretion, and Tiselius index were similar between balanced and imbalanced dietary phases. There were significant differences in calcium excretion (mg/g creatinine) between balanced and imbalanced diets in the 1-6 PM (83.1 vs 110.2, P <.04), 6-11 PM (71.3 vs 107.2, P <.02), and 11 PM-8 AM collections (55.0 vs 41.8, P <.02). There was significantly higher oxalate excretion on the balanced diet in the 1-6 pm time period (28.1 vs 16.7, P <.01). There were no differences in the Tiselius index in these collections.These results demonstrate that the sequence of ingesting relatively large amounts of oxalate does not significantly affect calcium oxalate stone risk if the recommended daily quantity of dietary calcium is consumed.
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