只在口渴时喝水；没有必要强迫自己每天喝固定的量。
原始表述
اشرب الماء حين تعطش فقط — لا داعي لإجبار نفسك على شرب كميات محددة يومياً.
按来源为原话. 译文由本项目提供；以阿拉伯语原文为准。
译文
只在口渴时喝水；没有必要强迫自己每天喝固定的量。
出处
- 来源状态
- 第三方网站（非官方）
- 归属
- Third-party site (unofficial; states it is not affiliated with Elawady)
- 出处
- https://altayybat.com/ar/
- 归属的不确定性
- Lowest attribution level; no source video given.
- 所声称的机制
Thirst accurately signals water needs.
- 所声称的健康影响
Avoiding overload of body systems with water
- 涉及人群
General population
- Elawady 设定的地域限制
none found
来源版本存在差异
- 来源状态
- 视频转录文本（本人原话）
- 归属
- Elawady (machine transcript)
- 视频
- Dr Diaa Al Awady د ضياء العوضي is live!لايف مش مهم خالص (打开来源)
- 发布日期
- 2026年2月11日
- 时间戳
- 无（转录文本不含时间信息）
- 归属的不确定性
- Archive transcript (YouTube CC or AI-generated); no timestamps; 'published' is the date listed by the archive and may be the upload date. Live-stream transcripts can contain viewer comments read aloud; the quoted passage was checked in context to be spoken by Elawady.
- 来源状态
- 视频转录文本（本人原话）
- 归属
- Elawady (machine transcript)
- 视频
- الجزء الرابع من الندوة (打开来源)
- 发布日期
- 2024年3月2日
- 时间戳
- 无（转录文本不含时间信息）
- 归属的不确定性
- Archive transcript (YouTube CC or AI-generated); no timestamps; 'published' is the date listed by the archive and may be the upload date. Live-stream transcripts can contain viewer comments read aloud; the quoted passage was checked in context to be spoken by Elawady.
科学评估
可能正确 – 有一些证据支持该说法，但不足以得出明确判断。
证据确定性: 低 – 进一步研究很可能大幅改变该评估。
1. 说法是什么？
Thirst alone should guide drinking.
2. 哪些内容可证实是正确的？
'No scientific studies were found in support of 8 x 8'; the osmoregulatory system maintains water balance in healthy adults (I-FAST-08).
3. 哪些内容是错误或夸大的？
The same review emphasises that higher intakes are advisable for prevention of some diseases and in hot climates and vigorous work (I-FAST-08). In an RCT, high water intake reduced kidney stone recurrence (12/99 vs 27/100 over 5 years) (I-FAST-09).
4. 哪些内容仍不明确？
Optimal intake in hot climates.
5. 哪些研究支持该说法？
I-FAST-08; I-FAST-123 (few trials; no proof that everyone needs a fixed amount).
6. 哪些研究与该说法相矛盾？
I-FAST-09 and Cochrane review of the same trial (I-FAST-122): increased water intake reduced stone recurrence (12/99 vs 27/100 over 5 years).
7. 对德国和欧洲而言情况如何？
EFSA adequate intakes for total water: 2.0 L/day women, 2.5 L/day men from all sources, for moderate temperature and activity (I-FAST-124; abstract verified via Crossref/OpenAlex).
8. 关于埃及的已知情况是什么？
Hot climate and kidney stone prevalence in Egypt make the exceptions practically important.
9. 合理的实际结论是什么？
对于处在温和环境中的健康成年人，口渴是一个合理的指引；在炎热环境中、有结石、年老或患病时，人们需要更有意识地多喝水。
评估详情
- 证据确定性的依据
For healthy adults in temperate conditions there is no evidence for '8 glasses a day' (narrative review, I-FAST-08) and only 18 RCTs on changing water intake exist (I-FAST-123). Extra water helps defined groups: stone recurrence RR 0.45 with higher intake (Cochrane, one RCT, low certainty; I-FAST-122). EFSA adequate intakes (2.0 L women, 2.5 L men, including food water) apply to moderate climate and activity (I-FAST-124); hot climates, heavy work, older age, fever and diarrhoea raise needs.
- 来源质量
Third-party site plus own words.
- 地区可推广性
Egypt's hot climate increases water needs; transfer from temperate-climate evidence is limited.
- 个体例外情况
Kidney stones, hot climate, heavy exercise, elderly, children, illness with fluid loss, people on SGLT2 inhibitors or diuretics.
- 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
仅在特定条件下成立 – 该说法仅在特定剂量、特定人群、特定制备方式或特定情况下成立。
研究问题: In healthy adults, is drinking according to thirst sufficient, without a fixed daily amount?
研究问题详解 (PICO)
- 人群
- Healthy adults; subgroups (stone formers, older adults, hot climate, heavy work)
- 干预或暴露
- Thirst-guided drinking
- 对照
- Fixed or increased intake
- 地域范围
- climate-dependent (hot climate in Egypt)
- 结局指标
- Hydration status
- Kidney stones
- Weight, other outcomes
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？
Do we need eight glasses of water a day?
Valtin H. Am J Physiol Regul Integr Comp Physiol 2002 · PMID 12376390 · DOI 10.1152/ajpregu.00365.2002 叙述性综述已核查摘要No scientific studies support '8 x 8'; osmoregulation is precise in healthy adults in temperate climate.
- 实际结果
- Narrative review.
- 方法学质量
- low (narrative review)
- 相关性
- direct
- 局限
- Old; temperate climate.
Trials of drinking more water
Hakam N et al.. JAMA Netw Open 2024 · PMID 39585691 · DOI 10.1001/jamanetworkopen.2024.47621 系统综述已核查摘要新增Few RCTs exist on changing water intake; benefits shown mainly for stones and weight loss.
- 实际结果
- 18 RCTs; 55% at least one positive result.
- 方法学质量
- moderate (systematic review)
- 相关性
- direct: no proof that a fixed amount is needed for everyone
- 局限
- No meta-analysis.
哪些证据不支持该说法？
Drinking more water to prevent kidney stones
Bao Y et al.. Cochrane Database Syst Rev 2020 · PMID 32045491 · DOI 10.1002/14651858.CD004292.pub4 系统综述已核查摘要新增For people with previous kidney stones, drinking enough to pass >=2 L urine/day reduces recurrence.
- 实际结果
- RR 0.45 (0.24-0.84); 149 fewer per 1000 over 5 years; low certainty.
- 方法学质量
- high-quality review, low-certainty evidence (1 RCT)
- 相关性
- direct for stone formers
- 局限
- Single trial (same as I-FAST-09).
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？
Healthy adults in moderate conditions can generally rely on thirst; there is no proof that everyone must drink a fixed amount. People with kidney stones, in hot climates, doing heavy work, older people (blunted thirst), children and the ill need deliberate, often higher intake.
为什么有些研究权重更大
Evidence is thin in both directions; Cochrane evidence for stone formers is the most rigorous.
因果关系是否已确立？ 有可能，尚未确立 Causal benefit of extra water shown only for stone recurrence (single RCT).
仍存在的不确定性
Optimal intake in hot climates.
合理的结论
Conditionally true.
为什么研究结果看起来互相矛盾？
Valtin (no need for 8x8) and Cochrane (more water for stone formers) address different populations; no true conflict.
这是否取决于国家？
- 一般生物学效应
- Universal osmoregulation.
- 饮食习惯
- Hot Egyptian summers and outdoor work increase water needs; temperate-climate reference values (EFSA) underestimate needs in heat.
- 食品原产地
- Not applicable.
- 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
- No Egyptian hydration surveillance data assessed.
足以改变结论的地区差异没有可靠数据支持。
统计复核
- Absolute effect and NNT from Borghi counts; independence of evidence – 12/99 vs 27/100: RR 0.45, ARR 14.9 points, NNT about 7; Cochrane and Borghi are the same trial (not independent). 已重新计算
总体证据的确定性（GRADE，简化版）
- 主要结局
- Adequacy of thirst-guided drinking for health in healthy adults
- 起始等级
- 低（观察性研究）
- 降级理由
- indirectness (temperate settings)
- 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
- EFSA NDA Panel: Scientific Opinion on Dietary Reference Values for water (2010) · 原始文献
Adequate total water intake (drinks plus food moisture) 2.0 L/day women, 2.5 L/day men, valid for moderate temperature and activity; more in pregnancy (+300 mL) and lactation (+about 700 mL). Abstract read via OpenAlex; EFSA page blocked (403).
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 |
|---|---|---|---|---|---|
| Europe PMC | 2026年10月26日 | JOURNAL:"Cochrane Database Syst Rev" AND TITLE:(water OR fluid) AND (stones OR nephrolithiasis OR urolithiasis) | 反对性证据 | 6 | |
| Europe PMC | 2026年10月26日 | ("water intake" OR hydration) AND (health outcomes OR mortality OR "chronic kidney disease" OR weight) AND ("systematic review" OR "umbrella review") AND TITLE:(water) | 双向 | 191 | |
| Europe PMC | 2026年10月26日 | ("ad libitum drinking" OR "drinking to thirst" OR "thirst-guided" OR "thirst") AND (hydration OR "fluid balance") AND (adequate OR sufficient) AND (healthy adults OR older adults) | 支持性证据 | 927 | |
| Crossref + OpenAlex | 2026年10月26日 | DOI 10.2903/j.efsa.2010.1459 (EFSA DRV water); EFSA/Wiley page returned 403 | 指南 | 1 |
待解决的问题
Evidence on thirst-guided drinking in hot climates.
核查深度如何？
5 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），5 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: 可能正确 (中)
- 2026年10月26日 · 第 4 阶段（系统证据审查） · 评定结论已更改: 可能正确 (中) → 可能正确 (低)
Verdict unchanged. Certainty lowered: the supporting evidence is a narrative review and the 2024 systematic review shows the trial base on water intake is thin in both directions; 'moderate' overstated it.
新来源: I-FAST-122 I-FAST-123 I-FAST-124
通俗解释
没有证据证明每个人每天都必须喝八杯水；生活在凉爽气候中的健康成年人通常可以依靠口渴感来喝水。但在炎热天气、从事繁重工作时、在老年阶段，或者对于曾患肾结石的人，喝得比口渴感提示的更多是很重要的。
与该说法相关的研究
支持该说法的研究 (1)
-
Do we need eight glasses of water a day?
Valtin H. Am J Physiol Regul Integr Comp Physiol 2002 · PMID 12376390 · DOI 10.1152/ajpregu.00365.2002叙述性综述独立交叉核查已核查摘要No proof for 8 glasses in healthy adults in mild climates, but more is needed in heat, hard work and some diseases.
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？
Is there evidence for '8 x 8' glasses of water a day?
- 研究是如何开展的？
Narrative review
- 研究了多少人、动物或样本？
not applicable; Healthy adults
- 实际发现了什么？
No evidence for 8 x 8.
- 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？
Thirst usually suffices if healthy and in mild climate.
- 该研究有哪些局限？
Narrative; Old
- 它对 Elawady 的具体说法说明了什么？
- 研究结果是否适用于德国和欧洲？
Temperate climate applies to Germany.
- 从该研究中明确不能得出什么结论？
Advice for hot climates or patients.
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 (2)
-
Drinking more water to prevent kidney stones
Borghi L et al.. J Urol 1996 · PMID 8583588随机对照试验独立交叉核查已核查摘要Over five years, stones came back in 12% of those drinking a lot vs 27% without advice.
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？
High water intake and calcium stone recurrence
- 研究是如何开展的？
Randomised prospective 5-year study
- 研究了多少人、动物或样本？
199 patients; First-episode idiopathic calcium stone formers (plus 101 controls)
- 实际发现了什么？
Recurrence halved.
- 观察到的效应有多大？
12% vs 27%
- 研究结果对日常生活意味着什么？
Stone formers should drink more.
- 该研究有哪些局限？
Not blinded; Single centre
- 它对 Elawady 的具体说法说明了什么？
- 研究结果是否适用于德国和欧洲？
Italian; directly applicable.
- 从该研究中明确不能得出什么结论？
Benefits in people without stones.
-
Drinking more water to prevent kidney stones
Bao Y et al.. Cochrane Database Syst Rev 2020 · PMID 32045491 · DOI 10.1002/14651858.CD004292.pub4系统综述独立交叉核查已核查摘要★ 关键研究People who had kidney stones and drank enough to pass 2 litres of urine a day had fewer new stones.
For people with previous stones, increased water intake (urine >=2 L/day) reduces recurrence (low certainty).
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？
Assess water for stone prevention.
- 研究是如何开展的？
Cochrane review.
- 研究了多少人、动物或样本？
1 RCT, 220 people.
- 实际发现了什么？
RR 0.45 for recurrence.
- 观察到的效应有多大？
149 fewer recurrences per 1000.
- 研究结果对日常生活意味着什么？
Stone formers should drink more than thirst alone suggests.
- 该研究有哪些局限？
Only one trial.
- 它对 Elawady 的具体说法说明了什么？
Limits the thirst-only rule; contradicts water restriction.
- 研究结果是否适用于德国和欧洲？
Applicable; stone disease common in Egypt's hot climate.
- 从该研究中明确不能得出什么结论？
Primary prevention.
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)
-
Trials of drinking more water
Hakam N et al.. JAMA Netw Open 2024 · PMID 39585691 · DOI 10.1001/jamanetworkopen.2024.47621系统综述独立交叉核查已核查摘要★ 关键研究Only 18 trials exist; drinking more water helped with kidney stones and weight loss in some.
Few RCTs; benefits of extra water shown mainly for stones and weight loss; no proof that everyone needs a fixed amount.
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？
Summarise RCTs of water intake.
- 研究是如何开展的？
Systematic review.
- 研究了多少人、动物或样本？
18 RCTs.
- 实际发现了什么？
Benefits for stones and weight in some trials.
- 观察到的效应有多大？
15 fewer stones per 100 over 5 years.
- 研究结果对日常生活意味着什么？
No strong proof that everyone must drink a set amount; some people benefit from drinking more.
- 该研究有哪些局限？
Few, heterogeneous trials.
- 它对 Elawady 的具体说法说明了什么？
Partly supports thirst-guided drinking; limits it for specific groups.
- 研究结果是否适用于德国和欧洲？
Applies; same physiology.
- 从该研究中明确不能得出什么结论？
Optimal intake in hot climates.
-
EU reference values for water
EFSA Panel on Dietetic Products, Nutrition, and Allergies (NDA). EFSA Journal 2010 · DOI 10.2903/j.efsa.2010.1459指南 / 立场声明独立交叉核查已核查摘要★ 关键研究European experts set adequate total water intake at 2.0 L/day for women and 2.5 L/day for men, including water in food.
AIs include water from food and apply to moderate conditions; they do not require forced drinking but define normal total 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？
Set reference values for water.
- 研究是如何开展的？
Expert review of intake and urine data.
- 研究了多少人、动物或样本？
not applicable
- 实际发现了什么？
AIs by age and sex.
- 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？
Normal water needs are substantial; heat increases them.
- 该研究有哪些局限？
Only for moderate climate and activity.
- 它对 Elawady 的具体说法说明了什么？
Contradicts water restriction; neutral on thirst-guided drinking.
- 研究结果是否适用于德国和欧洲？
EU reference; Egypt's hotter climate implies higher needs.
- 从该研究中明确不能得出什么结论？
Needs in hot climates.
该组中没有被标记为关键研究的研究。
地区背景
德国 / 欧盟
EFSA adequate intakes for total water: 2.0 L/day women, 2.5 L/day men from all sources, for moderate temperature and activity (I-FAST-124; abstract verified via Crossref/OpenAlex).
埃及
Hot climate and kidney stone prevalence in Egypt make the exceptions practically important.
在我的国家适用什么？
一般科学评估
可能正确 对于处在温和环境中的健康成年人是合理的，但有重要的例外。
该说法涉及生物学或医学关系。上述科学评估不论在哪个国家都适用；各国食品数据不会改变这一评估。
参考文献
- "Drink at least eight glasses of water a day." Really? Is there scientific evidence for "8 x 8"?. Valtin H. Am J Physiol Regul Integr Comp Physiol 2002 · PMID 12376390 · DOI 10.1152/ajpregu.00365.2002
- Urinary volume, water and recurrences in idiopathic calcium nephrolithiasis: a 5-year randomized prospective study.. Borghi L et al.. J Urol 1996 · PMID 8583588
- Water for preventing urinary stones.. Bao Y et al.. Cochrane Database Syst Rev 2020 · PMID 32045491 · DOI 10.1002/14651858.CD004292.pub4
- Outcomes in Randomized Clinical Trials Testing Changes in Daily Water Intake: A Systematic Review.. Hakam N et al.. JAMA Netw Open 2024 · PMID 39585691 · DOI 10.1001/jamanetworkopen.2024.47621
- Scientific Opinion on Dietary Reference Values for water.. EFSA Panel on Dietetic Products, Nutrition, and Allergies (NDA). EFSA Journal 2010 · DOI 10.2903/j.efsa.2010.1459