Drinking a lot of water harms the liver; one should drink only when thirsty and not 'flood' the body with water.
Original statement
شرب الميه كتير يضر الكبد طبعا طبعا
verbatim according to source. Translation by the project; the Arabic wording is authoritative.
Translation
Drinking a lot of water harms the liver; one should drink only when thirsty and not 'flood' the body with water.
Origin
- Source status
- Video transcript (own words)
- Attribution
- Elawady (machine transcript)
- Video
- Dr.D Clinics - Diaa Al Awady is live! الالتهاب الخلوي ❤️❤️❤️ (Open source)
- Published
- 25 May 2025
- Timestamp
- 0:12:00 (location in the original video’s automatic YouTube caption track; confirms where the words occur, not who speaks)
- Attribution uncertainty
- Short remark in a long live stream; machine transcript; context is a discussion of urea and creatinine.
- Claimed mechanism
Not explained.
- Claimed health effect
Liver damage; strain on organs.
- Population concerned
General population.
- Geographic restriction by Elawady
none found
Diverging source versions
اشرب الماء حين تعطش فقط — لا داعي لإجبار نفسك على شرب كميات محددة يومياً. الجسم يُخبرك باحتياجه للماء عبر العطش، ولا يُنصح بإغراق أجهزة جسمك بكميات مفرطة من الماء.
- Source status
- Third-party site (unofficial)
- Attribution
- Third-party site (unofficial by its own statement)
- Origin
- https://altayybat.com/ar/
- Attribution uncertainty
- Lowest attribution level; the site states it is unofficial.
دمك مباشره عشان كده ما بتخشش مباشره الميه بتعدي على الكبد الاول عشان كده الماء الكثير ضرر مباشر على خلايا الكبد الماء الكثير اللي بتتشرب ضرر مباشر وصريح على خلايا الكبد فما تسوليش ليه خلايا بتورم ورجليها بتورم
Drinking a lot of water directly harms liver cells, because water passes through the liver first; it makes cells and legs swell.
- Source status
- Video transcript (own words)
- Attribution
- Elawady (machine transcript)
- Video
- Dr.D Clinics - Diaa Al Awady is live! الكلي (Open source)
- Published
- 20 May 2025
- Timestamp
- 0:49:09 (location in the original video’s automatic YouTube caption track; confirms where the words occur, not who speaks)
- Attribution uncertainty
- 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.
Scientific assessment
Mostly false – Essential parts of the statement are not supported by the evidence or are strongly exaggerated.
Certainty of evidence: low – Further research is likely to change the assessment considerably.
1. What was claimed?
Much water harms the liver; drink only when thirsty.
2. What is demonstrably correct?
Forcing very large volumes is unnecessary for healthy people, and extreme intake can cause hyponatraemia.
3. What is wrong or exaggerated?
No evidence was found that drinking water harms the liver. 'Only when thirsty' may be insufficient for older people, in hot weather or with heavy sweating, and in people prone to kidney stones.
4. What remains unclear?
No study directly testing water intake and liver damage was found; the judgement on the liver part rests on the absence of any reported effect in reviews and on renal water physiology.
5. Which studies support it?
Partly, for the second half only: no scientific studies support a fixed '8 x 8' rule for healthy adults in temperate climates (I-FAST-08).
6. Which studies contradict it?
Reviews of water and health describe water as a critical nutrient and do not report liver damage from generous intake (I-INTC-01, I-FAST-08). I-INTC-01 states that thirst is blunted in older people ('it may be prudent for the elderly to learn to drink regularly when not thirsty') and may be inadequate during exercise and in children; this review was funded by Nestlé Waters. Larger intakes are advisable in some diseases and with heavy work in hot climates (I-FAST-08). In a 5-year RCT in people with calcium kidney stones, high water intake reduced recurrences (12/99 vs 27/100) (I-FAST-09), so 'only when thirsty' is not adequate for everyone.
7. What applies to Germany and Europe?
European reference values for water intake exist (EFSA); not fetched in this review.
8. What is known about Egypt?
In Egypt's hot climate, fluid needs are often higher.
9. What practical conclusion is appropriate?
Drink regularly according to thirst, climate and activity; people with specific diseases should follow medical advice on fluid intake.
Assessment details
- Rationale for certainty of evidence
No study links normal or generous water intake to liver damage (I-INTC-01, I-FAST-08). Extremely high intake over a short time can cause hyponatraemia, which affects the brain, not the liver (general knowledge; not sourced here). Thirst-guided drinking is adequate for many healthy adults but not for all, e.g. people with kidney stones (I-FAST-09) or in hot climates (I-FAST-08). Certainty raised from very_low to low because relevant reviews and an RCT are now linked; there is still no direct study of the liver question.
- Source quality
Brief remark; third-party site paraphrase.
- Regional transferability
Hot climate (Egypt) increases water needs.
- Individual exceptions
People with heart or kidney failure or hyponatraemia may be advised to restrict fluids by their doctor.
- Regional scope of the claim
- general (biological/medical)
- Last reviewed
- 26 October 2026 provisional
Scientific evidence in detail
Not supported by high-quality evidence – There is no good evidence for the claim; this alone does not prove it wrong.
Research question: Does drinking a lot of water harm the liver, and is drinking only when thirsty adequate for everyone?
Research question in detail (PECO)
- Population
- Adults
- Intervention or exposure
- High water intake
- Comparison
- Thirst-guided intake
- Geographic scope
- universal biology; climate-dependent needs
- Outcomes
- Liver injury
- Hyponatraemia
- Disease-specific outcomes (stones, cystitis, CKD)
Study results as reported by the authors. Our assessment follows below.
What speaks for the claim?
More water did not slow kidney disease
Clark WF et al.. JAMA 2018 · PMID 29801012 · DOI 10.1001/jama.2018.4930 Randomised controlled trialabstract checkednewly addedCKD WIT RCT: coaching to drink more water did not slow kidney decline (no benefit from extra water in this group).
- Actual result
- eGFR difference -0.3 (-1.8 to 1.2)
- Methodological quality
- high (RCT)
- Relevance
- indirect: supports 'no need to flood' only
- Limitations
- No liver outcomes
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 Narrative reviewabstract checkedValtin 2002: no scientific basis for a fixed 8x8 rule in healthy adults in temperate climates.
- Actual result
- As in packet
- Methodological quality
- low (narrative)
- Relevance
- indirect
- Limitations
- Old narrative review
What speaks against the claim?
Drinking more water reduced bladder infections
Hooton TM et al.. JAMA Intern Med 2018 · PMID 30285042 · DOI 10.1001/jamainternmed.2018.4204 Randomised controlled trialabstract checkednewly addedRCT: extra 1.5 L water/day halved recurrent cystitis in women who drank little.
- Actual result
- 1.7 vs 3.2 episodes/year
- Methodological quality
- moderate (open label, industry funded)
- Relevance
- direct against thirst-only for this group
- Limitations
- Danone-funded
Drinking more water to prevent kidney stones
RCT: high water intake reduced kidney stone recurrence.
- Actual result
- 12/99 vs 27/100
- Methodological quality
- moderate
- Relevance
- direct against thirst-only for stone formers
- Limitations
- Single trial
What does the overall evidence say?
Editorial assessment based on the studies above – not itself a study result.
Which position is better supported?
No evidence that water harms the liver; very high intake over a short time can cause hyponatraemia (not liver damage). Thirst is adequate for many healthy adults but not for everyone.
Why some studies weigh more
RCTs in specific groups and guideline advice outweigh the unsupported liver statement; no liver study exists in either direction.
Is a causal relationship established? Not established No mechanism or data for liver harm.
Remaining uncertainty
No direct study of water intake and liver outcomes.
Justified conclusion
Mostly false.
Does this depend on the country?
- General biological effects
- Universal.
- Eating habits
- Not decisive.
- Origin of the food
- Not relevant.
- Contaminants
- Drinking-water quality is a separate issue not addressed by the claim.
- National production conditions
- Not relevant.
- Legal rules
- Not relevant.
- Actual monitoring data
- Not applicable.
A regional difference that changes the conclusion is not supported by robust data.
Statistical re-check
- Ratio of cystitis episodes – 1.7/3.2 = 0.53; 111/216 = 0.51 recalculated
Certainty of the overall evidence (GRADE, simplified)
- Main outcome
- Liver harm from generous water intake
- Starting level
- low (observational studies)
- Reasons for downgrading
- indirectness (no direct studies)
- Result
- low
Simplified assessment by a single reviewer, following the GRADE approach; not a formal GRADE panel. GRADE rates the body of evidence for one outcome, not individual studies.
Clinical guidelines and official statements checked
- NICE: Irritable bowel syndrome in adults: diagnosis and management (CG61; I-GUT-110) (2008, updated 2017) · Original publication
Red-flag assessment and referral; regular meals; at least 8 cups of fluid per day, especially water; reduce alcohol and fizzy drinks; limiting high-fibre foods such as wholemeal/high-fibre flour and breads may help; exclusion diets such as low FODMAP only with a healthcare professional with dietary expertise. - EFSA: Scientific Opinion on Dietary Reference Values for water (EFSA Journal 2010; DOI 10.2903/j.efsa.2010.1459) (2010) · Original publication could not be retrieved; content not used
Search strategy
Documented literature searches for this review (search strings in the original database syntax).
| Database | Date | Search | Looking for | Hits | Included |
|---|---|---|---|---|---|
| Europe PMC | 26 October 2026 | ("water intake" OR "plain water" OR "fluid intake" OR "hydration") AND (liver OR hepatic OR "fatty liver" OR NAFLD OR MASLD) AND (cohort OR "cross-sectional" OR randomized OR randomised) | supporting evidence | 30153 | |
| Europe PMC | 26 October 2026 | TITLE:("water intake" OR "water consumption" OR "plain water" OR hydration OR "fluid intake") AND TITLE:(liver OR hepatic OR "fatty liver" OR NAFLD OR MASLD OR steatosis) | supporting evidence | 61 | |
| Europe PMC | 26 October 2026 | ("water intoxication" OR "exercise-associated hyponatremia" OR "hyponatraemia") AND ("water intake" OR "excessive drinking" OR overhydration) AND (consensus OR review) | supporting evidence | 656 | |
| Europe PMC | 26 October 2026 | TITLE:("increased water intake" OR "water intake") AND (randomized OR randomised) AND (health OR outcomes) | contradicting evidence | 134 | |
| Web (curl/WebFetch of guideline page) | 26 October 2026 | https://www.nice.org.uk/guidance/cg61/chapter/Recommendations | guidelines | 1 | |
| Web (curl/WebFetch of guideline page) | 26 October 2026 | https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010.1459 and https://www.efsa.europa.eu/en/efsajournal/pub/1459 (both HTTP 403; DOI title confirmed via Crossref only) | guidelines | 1 |
Open questions
Any liver outcome data related to water intake.
How deeply was this checked?
6 linked studies: 2 checked in full text (1 of them with a structured risk-of-bias assessment), 4 on the basis of the abstract, 0 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.
Last scientific review: 26 October 2026
History of the verdict
- 25 October 2026 · Phase 1 · Initial assessment: Mostly false (low)
- 26 October 2026 · Phase 4 (systematic evidence review) · Re-examined with extended evidence; verdict unchanged: Mostly false (low)
New RCTs clarify the 'thirst only' part but no liver data exist; unchanged.
New sources: I-GUT-110 I-GUT-116 I-GUT-117
In plain language
There is no evidence that drinking plenty of water damages the liver. The kidneys remove extra water. Drinking huge amounts very quickly can be dangerous because it dilutes the salt in the blood, but this is rare. Older people and people in hot climates should not rely only on thirst.
Studies on this claim
Studies supporting the claim (0)
No studies in this group.
Studies contradicting or limiting the claim (4)
-
Why the body needs water
Popkin BM et al.. Nutr Rev 2010 · PMID 20646222 · DOI 10.1111/j.1753-4887.2010.00304.xNarrative reviewindependent cross-checkfull text, structured risk-of-bias assessmentWater is a critical nutrient; without it a person dies within days. Long-term trials on ideal intake are missing.
No liver harm from water is described; knowledge gaps concern requirements, not liver damage.
Does the study support the specific claim? No · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Summarise knowledge on water intake and health
- How was the study done?
Narrative review
- How many people, animals or samples were studied?
Published literature
- What was actually found?
Water is essential; requirements are poorly measured
- How large was the observed effect?
not applicable
- What do the results mean in everyday life?
We cannot live without water; how much each person needs varies.
- What are the study's limitations?
Not systematic; funded by a bottled-water company; no long-term trials exist
- What does it say about Elawady's specific claim?
Contradicts 'zero intake gives health'; gives no evidence that water harms the liver; notes that thirst alone may not suffice for older people, children and during exercise
- Do the results apply to Germany and Europe?
Applicable
- What can explicitly not be concluded from this study?
Exact water requirement for an individual
-
Drinking more water to prevent kidney stones
Borghi L et al.. J Urol 1996 · PMID 8583588Randomised controlled trialindependent cross-checkabstract checkedOver five years, stones came back in 12% of those drinking a lot vs 27% without advice.
Does the study support the specific claim? No · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
High water intake and calcium stone recurrence
- How was the study done?
Randomised prospective 5-year study
- How many people, animals or samples were studied?
199 patients; First-episode idiopathic calcium stone formers (plus 101 controls)
- What was actually found?
Recurrence halved.
- How large was the observed effect?
12% vs 27%
- What do the results mean in everyday life?
Stone formers should drink more.
- What are the study's limitations?
Not blinded; Single centre
- What does it say about Elawady's specific claim?
- Do the results apply to Germany and Europe?
Italian; directly applicable.
- What can explicitly not be concluded from this study?
Benefits in people without stones.
-
UK guideline on irritable bowel syndrome
National Institute for Health and Care Excellence (NICE). NICE guideline CG61 2008 (last updated 04 April 2017)Guideline / position statementindependent cross-checkfull text checkedNICE suggests regular meals, plenty of fluids, fewer fizzy drinks and possibly less high-fibre bread, with supervised diets if needed.
Advises at least 8 cups of fluid per day for people with IBS
Does the study support the specific claim? Partly · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Guide IBS care.
- How was the study done?
National guideline.
- How many people, animals or samples were studied?
Adults with IBS.
- What was actually found?
Diet and lifestyle advice first; low FODMAP with expert help; red flags referred.
- How large was the observed effect?
Not applicable.
- What do the results mean in everyday life?
Food changes can help IBS, guided by professionals.
- What are the study's limitations?
Older diet evidence.
- What does it say about Elawady's specific claim?
Partly supports diet changes; contradicts 'drink only when thirsty' for IBS.
- Do the results apply to Germany and Europe?
Applies to Europe.
- What can explicitly not be concluded from this study?
Not proof of cure.
-
Drinking more water reduced bladder infections
Hooton TM et al.. JAMA Intern Med 2018 · PMID 30285042 · DOI 10.1001/jamainternmed.2018.4204Randomised controlled trialindependent cross-checkabstract checkedWomen with frequent bladder infections who drank an extra 1.5 litres of water daily had about half as many infections over a year.
Extra 1.5 L/day halved recurrent cystitis in low drinkers
Does the study support the specific claim? No · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Test extra water for recurrent cystitis.
- How was the study done?
12-month RCT.
- How many people, animals or samples were studied?
140 women who drank little.
- What was actually found?
Infections fell from 3.2 to 1.7 per year.
- How large was the observed effect?
Difference 1.5 episodes (1.2-1.8).
- What do the results mean in everyday life?
For some people, drinking more than thirst suggests helps.
- What are the study's limitations?
Open label, funded by a water company.
- What does it say about Elawady's specific claim?
Contradicts 'only drink when thirsty' for everyone.
- Do the results apply to Germany and Europe?
Applicable in Europe.
- What can explicitly not be concluded from this study?
Says nothing about the liver.
No study in this group is marked as key.
Studies with mixed or unclear results (2)
-
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.00365.2002Narrative reviewindependent cross-checkabstract checkedNo proof for 8 glasses in healthy adults in mild climates, but more is needed in heat, hard work and some diseases.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Is there evidence for '8 x 8' glasses of water a day?
- How was the study done?
Narrative review
- How many people, animals or samples were studied?
not applicable; Healthy adults
- What was actually found?
No evidence for 8 x 8.
- How large was the observed effect?
not applicable
- What do the results mean in everyday life?
Thirst usually suffices if healthy and in mild climate.
- What are the study's limitations?
Narrative; Old
- What does it say about Elawady's specific claim?
Supports C-FAST-09; partly C-FAST-10 (no fixed high intake), with stated exceptions.
- Do the results apply to Germany and Europe?
Temperate climate applies to Germany.
- What can explicitly not be concluded from this study?
Advice for hot climates or patients.
-
More water did not slow kidney disease
Clark WF et al.. JAMA 2018 · PMID 29801012 · DOI 10.1001/jama.2018.4930Randomised controlled trialindependent cross-checkabstract checkedCoaching people with kidney disease to drink about 0.6 L more per day did not change kidney function over a year.
No benefit and no harm of extra water on kidney function in CKD
Does the study support the specific claim? Partly · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Test extra water in CKD.
- How was the study done?
RCT, 12 months.
- How many people, animals or samples were studied?
631 adults.
- What was actually found?
No difference in eGFR decline.
- How large was the observed effect?
-0.3 mL/min (-1.8 to 1.2).
- What do the results mean in everyday life?
Extra water is not a treatment for everyone, but it was not harmful here.
- What are the study's limitations?
Short; no liver outcomes.
- What does it say about Elawady's specific claim?
Partly supports not over-drinking; does not support liver harm.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot show liver effects.
No study in this group is marked as key.
Regional context
Germany / EU
European reference values for water intake exist (EFSA); not fetched in this review.
Egypt
In Egypt's hot climate, fluid needs are often higher.
What applies in my country?
General scientific assessment
Mostly false Mostly false: no evidence that water harms the liver; thirst alone is not always a good guide.
This statement concerns biological or medical relationships. The scientific assessment above applies regardless of the country; country-specific food data do not change it.
References
- Water, hydration, and health.. Popkin BM et al.. Nutr Rev 2010 · PMID 20646222 · DOI 10.1111/j.1753-4887.2010.00304.x
- Urinary volume, water and recurrences in idiopathic calcium nephrolithiasis: a 5-year randomized prospective study.. Borghi L et al.. J Urol 1996 · PMID 8583588
- Irritable bowel syndrome in adults: diagnosis and management (NICE guideline CG61). National Institute for Health and Care Excellence (NICE). NICE guideline CG61 2008 (last updated 04 April 2017)
- Effect of Increased Daily Water Intake in Premenopausal Women With Recurrent Urinary Tract Infections: A Randomized Clinical Trial.. Hooton TM et al.. JAMA Intern Med 2018 · PMID 30285042 · DOI 10.1001/jamainternmed.2018.4204
- "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
- Effect of Coaching to Increase Water Intake on Kidney Function Decline in Adults With Chronic Kidney Disease: The CKD WIT Randomized Clinical Trial.. Clark WF et al.. JAMA 2018 · PMID 29801012 · DOI 10.1001/jama.2018.4930