富含草酸盐的绿叶菜（菠菜、甜菜叶、莙荙菜）会导致肾结石；膳食草酸盐每增加 100 mg，尿草酸盐约升高 2.7 mg。
原始表述
无阿拉伯语原文。
译文
富含草酸盐的绿叶菜（菠菜、甜菜叶、莙荙菜）会导致肾结石；膳食草酸盐每增加 100 mg，尿草酸盐约升高 2.7 mg。
出处
- 来源状态
- 档案网站编辑
- 归属
- Archive editors
- 出处
- https://eltayebat.com/rule/leafy-greens-cucurbits/
- 归属的不确定性
- Archive editorial text and study selection written by the archive operators, not necessarily by Elawady.
- 所声称的机制
Dietary oxalate increases urinary oxalate and calcium-oxalate crystallisation.
- 所声称的健康影响
Kidney stones.
- 涉及人群
Everyone
- Elawady 设定的地域限制
none found
科学评估
基本错误 – 该说法的主要部分没有证据支持，或被严重夸大。
证据确定性: 中 – 进一步研究仍可能影响该评估。
1. 说法是什么？
Oxalate-rich greens cause kidney stones.
2. 哪些内容可证实是正确的？
Spinach is the main oxalate source; high spinach intake (>=8 servings/month) was modestly associated with stones in men (RR 1.30) and older women (RR 1.34). Dietary oxalate contributes to urinary oxalate (Crivelli 2020; Holmes 2001, I-VEG-118: 24-42% of urinary oxalate on controlled diets). The archive's figure is correctly reproduced: in controlled diets, urinary oxalate rises by about 2.7 mg per 100 mg of dietary oxalate within 50-750 mg/day (Mitchell et al., I-VEG-116, as cited in Bargagli 2020). Calcium oxalate stone formers with high urinary oxalate are advised to moderate oxalate-rich foods.
3. 哪些内容是错误或夸大的？
The cohort authors concluded that the data 'do not implicate dietary oxalate as a major risk factor'; in free-living people the highest vs lowest quartile of dietary oxalate differed by only 1.7 mg/day in urinary oxalate (Taylor 2008, I-VEG-117). A vegetable- and legume-rich DASH diet was associated with markedly fewer stones (RR 0.55-0.60). Boiling removes 30-87% of soluble oxalate (Chai 2005, I-VEG-119), and eating calcium with meals reduces absorption. The archive's cited J Urol study is an animal model with an oxalate precursor, not green vegetables.
4. 哪些内容仍不明确？
The effect of very high spinach intake in specific populations (e.g. hot climates) is uncertain.
5. 哪些研究支持该说法？
Mitchell 2019 (I-VEG-116, 2.7 mg per 100 mg); Taylor 2007 (modest association); Holmes 2001 (I-VEG-118); Khan 2007 (rat model).
6. 哪些研究与该说法相矛盾？
Taylor 2007 (conclusion); Taylor 2008 (I-VEG-117, small effect on urinary oxalate); Taylor 2009 (DASH); Chai 2005 (I-VEG-119, cooking).
7. 对德国和欧洲而言情况如何？
Kidney-stone guidance in Europe advises adequate fluid and calcium, with oxalate moderation for recurrent stone formers.
8. 关于埃及的已知情况是什么？
Kidney stones are common in Egypt; hydration is the key preventive measure (not reviewed in detail).
9. 合理的实际结论是什么？
对大多数人来说，吃绿叶菜不会显著增加结石风险；结石患者应获得个体化的建议。
评估详情
- 证据确定性的依据
Large cohorts (240,000 participants) found only a modest association between oxalate intake and stones in men and older women (RR ~1.2), none in younger women; the authors concluded that dietary oxalate is not a major risk factor. A DASH-style diet rich in vegetables and legumes was associated with 40-45% lower stone risk.
- 来源质量
The archive's 2.7 mg figure does not appear in the abstract of the cited J Urol paper, which is a rat study using hydroxy-L-proline, not a human dietary-oxalate study.
- 地区可推广性
US cohorts; transferable to Germany and Egypt with caution (Egypt has high stone prevalence linked to climate and fluid intake; not reviewed).
- 个体例外情况
Recurrent calcium-oxalate stone formers, people with enteric hyperoxaluria or CKD may need to limit high-oxalate foods individually and ensure adequate calcium.
- 说法的地域范围
- 普遍性（生物学/医学）
- 最近审核
- 2026年10月26日 初步
科学证据详解
过度解读 – 确有真实的发现，但该说法从中引申出的结论超出了数据所能支持的范围（例如把关联当作因果、把动物数据套用到人身上、把小效应说成大效应）。
研究问题: Do oxalate-rich greens cause kidney stones in the general population, and does each 100 mg dietary oxalate raise urinary oxalate by about 2.7 mg?
研究问题详解 (PECO)
- 人群
- General population; calcium oxalate stone formers
- 干预或暴露
- Dietary oxalate from spinach, chard, beet greens
- 对照
- Low oxalate intake
- 地域范围
- universal biology; hot climates increase stone risk
- 结局指标
- incident kidney stones
- urinary oxalate
研究结果按作者报告呈现。我们的评估见下文。
哪些证据支持该说法？
Dietary oxalate raises urinary oxalate
Mitchell T et al.. Am J Physiol Renal Physiol 2019 · PMID 30566003 · DOI 10.1152/ajprenal.00373.2018 叙述性综述已核查摘要新增Mitchell 2019 review incl. controlled-diet data.
- 实际结果
- 2.7 mg urinary oxalate per 100 mg dietary oxalate (50-750 mg/day, 1,000 mg calcium), as cited in Bargagli 2020; diet supplies ~half of urinary oxalate; avoid oxalate-rich foods if stone former.
- 方法学质量
- low-moderate (narrative review)
- 相关性
- direct for the number
- 局限
- Narrative; figure verified via secondary citation.
Dietary oxalate and kidney stones
Taylor & Curhan 2007 cohorts (240,000).
- 实际结果
- Spinach >=8 servings/month: RR 1.30 men, 1.34 older women; modest overall association.
- 方法学质量
- moderate
- 相关性
- direct
- 局限
- Authors concluded oxalate not a major risk factor.
哪些证据不支持该说法？
Vegetable-rich diet and kidney stones
Taylor 2009 DASH-style diet cohorts.
- 实际结果
- Highest vs lowest DASH score: RR 0.55-0.60 for stones.
- 方法学质量
- moderate
- 相关性
- direct (vegetable-rich diet)
- 局限
- Observational.
Usual dietary oxalate changes urine oxalate only a little
Taylor EN et al.. Clin J Am Soc Nephrol 2008 · PMID 18650406 · DOI 10.2215/CJN.01410308 横断面研究已核查摘要新增Taylor 2008 cross-sectional 24-h urines (3,348).
- 实际结果
- Q4 vs Q1 dietary oxalate: +1.7 mg/d urinary oxalate (4-7% of median).
- 方法学质量
- moderate
- 相关性
- direct
- 局限
- Cross-sectional.
总体证据说明了什么？
基于上述研究的编辑评估——其本身并非研究结果。
哪种观点有更好的证据支持？
The 2.7 mg per 100 mg figure is a correct reproduction of controlled-diet data, and stone formers with high urinary oxalate are advised to moderate oxalate-rich foods. In the general population, greens are at most a modest stone risk factor, and vegetable-rich (DASH) diets are associated with fewer stones.
为什么有些研究权重更大
Large cohorts with stone outcomes outweigh physiological slopes; controlled diets explain mechanism.
因果关系是否已确立？ 有可能，尚未确立 Dietary oxalate raises urinary oxalate (causal mechanism), but a causal effect of normal greens intake on stones in the general population is not established.
仍存在的不确定性
Very high spinach intakes in hot climates; people with enteric hyperoxaluria or primary hyperoxaluria.
合理的结论
The quantitative statement is correct; the sweeping claim that greens cause kidney stones is overstated.
为什么研究结果看起来互相矛盾？
Controlled diets (Holmes 2001; Mitchell) show a larger dietary contribution than free-living cohorts (Taylor 2008) because calcium co-intake, measurement error and range of intake differ.
这是否取决于国家？
- 一般生物学效应
- Universal physiology.
- 饮食习惯
- High heat and low fluid intake in Egypt increase stone risk; molokhia and spinach are common.
- 食品原产地
- Oxalate content depends on plant and preparation (boiling removes 30-87% soluble oxalate).
- 污染物
- not applicable
- 本国生产条件
- not applicable
- 法律规则
- not applicable
- 实际监测数据
- not applicable
足以改变结论的地区差异没有可靠数据支持。
统计复核
- Implied urinary increment at realistic intakes – 250 mg/day -> +6.8 mg/day (linear). 已重新计算
- Relative size of quartile difference – +1.7 mg/d = 4.4-6.5% of median excretion. 已重新计算
总体证据的确定性（GRADE，简化版）
- 主要结局
- Incident kidney stones with higher greens/oxalate intake (general population)
- 起始等级
- 低（观察性研究）
- 降级理由
- inconsistency (sex/age-specific)
- 结果
- 低
由单名审查者参照 GRADE 方法进行的简化评估；并非正式的 GRADE 专家组评估。GRADE 评价的是针对某一结局的整体证据，而非单项研究。
已核查的临床指南和官方声明
- American Urological Association: Medical Management of Kidney Stones: AUA Guideline (2026) Part I (PMID 42529981) (2026) · 原始文献
PubMed abstract only: provides dietary measures for patients with calcium stones to reduce recurrence; specific oxalate wording not visible in the abstract (full guideline page not accessible).
检索策略
本次审查的文献检索记录（检索式采用原数据库语法）。
| 数据库 | 日期 | 检索式 | 检索目标 | 命中数 | 纳入数 |
|---|---|---|---|---|---|
| PubMed | 2026年10月26日 | ("dietary oxalate" OR "oxalate intake") AND ("urinary oxalate") AND (determinants OR "24-hour" OR cohort) | 支持性证据 | 95 | |
| PubMed | 2026年10月26日 | (kidney stone* OR nephrolithiasis) AND (guideline[pt] OR "practice guideline"[pt] OR guideline[ti]) AND (diet* OR oxalate) AND (medical management OR prevention) | 指南 | 22 | |
| Europe PMC | 2026年10月26日 | (spinach OR "leafy vegetables" OR "vegetable intake" OR "plant-based") AND (nephrolithiasis OR "kidney stone") AND (cohort OR "meta-analysis") AND (risk) | 反对性证据 | 671 | |
| Europe PMC | 2026年10月26日 | "dietary oxalate" AND "urinary oxalate" AND "2.7 mg" | 支持性证据 | 10 | |
| PubMed | 2026年10月26日 | (Egypt[tiab] OR Egyptian[tiab]) AND (urolithiasis OR "kidney stone*" OR nephrolithiasis) AND (diet* OR oxalate) | 双向 | 22 | |
| AUA website | 2026年10月26日 | https://www.auanet.org/guidelines-and-quality/guidelines/kidney-stones-medical-mangement-guideline (HTTP 404); PubMed record of AUA 2026 guideline used | 指南 | 0 |
待解决的问题
Effect in people with primary hyperoxaluria (reported in Egyptian families) - an individual exception requiring medical advice.
核查深度如何？
8 项相关研究：0 项核查了全文（其中 0 项进行了结构化偏倚风险评估），8 项基于摘要核查，0 项仅核查了文献信息。 尚未进行由两名独立审查者完成的正式评估，也尚未进行独立的人类专家审核。
最近一次科学审核: 2026年10月26日
评定结论的变更历史
- 2026年10月25日 · 第 1 阶段 · 初始评估: 基本错误 (中)
- 2026年10月26日 · 第 4 阶段（系统证据审查） · 在扩展证据后重新审查；评定结论不变: 基本错误 (中)
The 2.7 mg per 100 mg figure, previously "not verified", is now verified as a correct reproduction of the controlled-diet literature (Mitchell 2019 as cited by Bargagli 2020). This corrects the review text but does not change the verdict on the causal claim.
新来源: I-VEG-116 I-VEG-117 I-VEG-118 I-VEG-119
通俗解释
菠菜和其他一些绿叶菜含有草酸盐，而大多数肾结石中都有这种物质。在大型研究中，草酸盐吃得最多的人结石风险只略高一点，作者得出结论：膳食草酸盐不是一个主要的风险因素。吃富含蔬菜、水果和豆类饮食的人，肾结石实际上少得多。档案网站引用的动物研究并没有检验蔬菜。
与该说法相关的研究
支持该说法的研究 (2)
-
Oxalate precursor and kidney crystals in rats
Khan SR et al.. J Urol 2007 · PMID 17870111 · DOI 10.1016/j.juro.2007.06.046动物研究被 Tayebat 档案网站引用已核查摘要Rats fed an oxalate precursor developed kidney crystals that partly cleared after stopping it.
该研究是否支持这一具体说法？ 不明确 · 方法学质量: 低 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Test oxalate reduction in rats
- 研究是如何开展的？
Animal experiment
- 研究了多少人、动物或样本？
Rats
- 实际发现了什么？
Crystals formed, partly reversible
- 观察到的效应有多大？
Not applicable
- 研究结果对日常生活意味着什么？
No direct meaning for vegetable eating.
- 该研究有哪些局限？
Animal; precursor
- 它对 Elawady 的具体说法说明了什么？
Very indirect
- 研究结果是否适用于德国和欧洲？
Low
- 从该研究中明确不能得出什么结论？
Cannot show greens cause stones in humans.
-
Dietary oxalate raises urinary oxalate
Mitchell T et al.. Am J Physiol Renal Physiol 2019 · PMID 30566003 · DOI 10.1152/ajprenal.00373.2018叙述性综述独立交叉核查已核查摘要★ 关键研究About half of urinary oxalate comes from food; a cited controlled-diet estimate is 2.7 mg more urinary oxalate per 100 mg eaten.
Confirms the 2.7 mg per 100 mg figure and advice for stone formers to avoid oxalate-rich foods.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 低 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Review the role of dietary oxalate in stones.
- 研究是如何开展的？
Narrative review.
- 研究了多少人、动物或样本？
Not applicable.
- 实际发现了什么？
Diet contributes about half of urinary oxalate; restriction advised for stone formers.
- 观察到的效应有多大？
2.7 mg per 100 mg (cited).
- 研究结果对日常生活意味着什么？
Kidney-stone patients may need to limit spinach-type foods; others usually do not.
- 该研究有哪些局限？
Narrative.
- 它对 Elawady 的具体说法说明了什么？
Number correct; general causal claim overstated.
- 研究结果是否适用于德国和欧洲？
Universal.
- 从该研究中明确不能得出什么结论？
Cannot show that greens cause stones in healthy people.
该组中没有被标记为关键研究的研究。
与该说法相矛盾或限制该说法的研究 (4)
-
Dietary oxalate and kidney stones
Taylor EN, Curhan GC. J Am Soc Nephrol 2007 · PMID 17538185 · DOI 10.1681/ASN.2007020219队列研究独立交叉核查已核查摘要★ 关键研究Highest oxalate intake raised stone risk only modestly (about 20%) in some groups; authors: not a major risk factor.
该研究是否支持这一具体说法？ 否 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Oxalate and stones
- 研究是如何开展的？
Cohorts
- 研究了多少人、动物或样本？
240,681
- 实际发现了什么？
Modest or no association
- 观察到的效应有多大？
RR ~1.2
- 研究结果对日常生活意味着什么？
Greens not a major stone risk.
- 该研究有哪些局限？
FFQ
- 它对 Elawady 的具体说法说明了什么？
Contradicts general claim
- 研究结果是否适用于德国和欧洲？
Moderate
- 从该研究中明确不能得出什么结论？
Cannot address stone formers specifically.
-
Vegetable-rich diet and kidney stones
Taylor EN et al.. J Am Soc Nephrol 2009 · PMID 19679672 · DOI 10.1681/ASN.2009030276队列研究独立交叉核查已核查摘要★ 关键研究People with a diet rich in vegetables, fruit and legumes had about 40-45% fewer kidney stones.
该研究是否支持这一具体说法？ 否 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
DASH and stones
- 研究是如何开展的？
Cohorts
- 研究了多少人、动物或样本？
~240,000
- 实际发现了什么？
Fewer stones
- 观察到的效应有多大？
RR 0.55-0.60
- 研究结果对日常生活意味着什么？
Vegetables protect rather than harm.
- 该研究有哪些局限？
Observational
- 它对 Elawady 的具体说法说明了什么？
Contradicts claim
- 研究结果是否适用于德国和欧洲？
Moderate
- 从该研究中明确不能得出什么结论？
Cannot prove causation.
-
Usual dietary oxalate changes urine oxalate only a little
Taylor EN et al.. Clin J Am Soc Nephrol 2008 · PMID 18650406 · DOI 10.2215/CJN.01410308横断面研究独立交叉核查已核查摘要★ 关键研究People eating the most oxalate excreted only 1.7 mg/day more oxalate than those eating the least.
Small effect of usual dietary oxalate on urinary oxalate.
该研究是否支持这一具体说法？ 否 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Find determinants of urinary oxalate.
- 研究是如何开展的？
Cross-sectional cohort analysis.
- 研究了多少人、动物或样本？
3,348 adults.
- 实际发现了什么？
Small dietary oxalate effect; vitamin C, BMI, diabetes matter.
- 观察到的效应有多大？
+1.7 mg/d (Q4 vs Q1).
- 研究结果对日常生活意味着什么？
Ordinary amounts of greens hardly change kidney-stone chemistry.
- 该研究有哪些局限？
Cross-sectional; imprecise intake.
- 它对 Elawady 的具体说法说明了什么？
Limits the claim.
- 研究结果是否适用于德国和欧洲？
Transferable.
- 从该研究中明确不能得出什么结论？
Cannot exclude effects of very high intakes.
-
Boiling greens removes much of their oxalate
Chai W et al.. J Agric Food Chem 2005 · PMID 15826055 · DOI 10.1021/jf048128d检测 / 残留研究独立交叉核查已核查摘要Boiling cut soluble oxalate by 30-87% in nine vegetables; steaming removed less.
Boiling removes 30-87% of soluble oxalate; preparation modifies exposure.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Measure oxalate loss with cooking.
- 研究是如何开展的？
Food analysis.
- 研究了多少人、动物或样本？
9 vegetables.
- 实际发现了什么？
Boiling most effective.
- 观察到的效应有多大？
30-87% reduction.
- 研究结果对日常生活意味着什么？
Boiled greens (water discarded) contain far less soluble oxalate than raw juice.
- 该研究有哪些局限？
No human outcomes.
- 它对 Elawady 的具体说法说明了什么？
Limits the generalisation; supports the juicing-specific risk.
- 研究结果是否适用于德国和欧洲？
Universal.
- 从该研究中明确不能得出什么结论？
Cannot show stone risk directly.
该组中没有被标记为关键研究的研究。
结果不一或不明确的研究 (2)
-
Where urinary oxalate comes from
Crivelli JJ et al.. Nutrients 2020 · PMID 33379176 · DOI 10.3390/nu13010062叙述性综述独立交叉核查已核查摘要Dietary oxalate contributes to urinary oxalate, modified by gut bacteria and calcium.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Review oxalate
- 研究是如何开展的？
Review
- 研究了多少人、动物或样本？
Not applicable
- 实际发现了什么？
Diet contributes; gut bacteria modify
- 观察到的效应有多大？
Not applicable
- 研究结果对日常生活意味着什么？
Calcium with meals and moderation help stone formers.
- 该研究有哪些局限？
Narrative
- 它对 Elawady 的具体说法说明了什么？
Context
- 研究结果是否适用于德国和欧洲？
High
- 从该研究中明确不能得出什么结论？
Cannot quantify stone risk.
-
Diet supplies a sizeable share of urine oxalate
Holmes RP et al.. Kidney Int 2001 · PMID 11135080 · DOI 10.1046/j.1523-1755.2001.00488.x其他独立交叉核查已核查摘要In controlled diets, food supplied 24-42% of urinary oxalate, and more (53%) when calcium intake was low.
Diet contributes 24-53% of urinary oxalate, depending on calcium intake.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Quantify dietary contribution to urinary oxalate.
- 研究是如何开展的？
Controlled feeding.
- 研究了多少人、动物或样本？
Healthy adults (n not in abstract).
- 实际发现了什么？
Dietary share 24-53%.
- 观察到的效应有多大？
See results.
- 研究结果对日常生活意味着什么？
Eating calcium with oxalate-rich greens reduces oxalate absorption.
- 该研究有哪些局限？
Small, physiological endpoint.
- 它对 Elawady 的具体说法说明了什么？
Mixed.
- 研究结果是否适用于德国和欧洲？
Universal.
- 从该研究中明确不能得出什么结论？
Cannot show stone risk.
该组中没有被标记为关键研究的研究。
地区背景
德国 / 欧盟
Kidney-stone guidance in Europe advises adequate fluid and calcium, with oxalate moderation for recurrent stone formers.
埃及
Kidney stones are common in Egypt; hydration is the key preventive measure (not reviewed in detail).
在我的国家适用什么？
一般科学评估
基本错误 2.7 mg 这一数字是正确的，但绿叶菜一般不会导致肾结石；适度控制草酸盐是针对结石患者的建议。
以下食品安全领域与该说法相关：
- 农药与农药残留
- 污染物（重金属、PFAS、PCB、二噁英、硝酸盐）
- 病原体（沙门氏菌、弯曲杆菌等）
水果与蔬菜
选择一个国家，查看针对该国已核查的信息。
局限：法律规则描述的是允许什么，而不是每一种食品实际含有什么。检测数据来自样本，只有结合其方法细节才有意义。
参考文献
- Dietary oxalate and calcium oxalate nephrolithiasis.. Khan SR et al.. J Urol 2007 · PMID 17870111 · DOI 10.1016/j.juro.2007.06.046
- Dietary oxalate and kidney stone formation.. Mitchell T et al.. Am J Physiol Renal Physiol 2019 · PMID 30566003 · DOI 10.1152/ajprenal.00373.2018
- Oxalate intake and the risk for nephrolithiasis.. Taylor EN, Curhan GC. J Am Soc Nephrol 2007 · PMID 17538185 · DOI 10.1681/ASN.2007020219
- DASH-style diet associates with reduced risk for kidney stones.. Taylor EN et al.. J Am Soc Nephrol 2009 · PMID 19679672 · DOI 10.1681/ASN.2009030276
- Determinants of 24-hour urinary oxalate excretion.. Taylor EN et al.. Clin J Am Soc Nephrol 2008 · PMID 18650406 · DOI 10.2215/CJN.01410308
- Effect of different cooking methods on vegetable oxalate content.. Chai W et al.. J Agric Food Chem 2005 · PMID 15826055 · DOI 10.1021/jf048128d
- Contribution of Dietary Oxalate and Oxalate Precursors to Urinary Oxalate Excretion.. Crivelli JJ et al.. Nutrients 2020 · PMID 33379176 · DOI 10.3390/nu13010062
- Contribution of dietary oxalate to urinary oxalate excretion.. Holmes RP et al.. Kidney Int 2001 · PMID 11135080 · DOI 10.1046/j.1523-1755.2001.00488.x