Drinking water at the correct time
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Aacha tharki 
These claims are misleading.
“There is no clinical trial to support these claims," Dr. Nannette Rey, a board member of the Philippine Heart Association, told AFP in an email on February 27, 2020.
Such claims “are actually derived from known benefits of water and just extrapolated and passed on as clinical recommendations, when in fact the only recommendation is just to drink enough fluids," Rey said. “What is recommended is to keep yourself hydrated the whole day for vital body function."
Dr. Ranulfo Javelosa Jr., the Chief of the Preventive Cardiology Division of the Philippine Heart Center, also told AFP that the claims are "medical myths."
During a phone conversation with AFP on February 27, 2020, Javelosa said that heart diseases most often arise from a combination of factors including “cholesterol, sugar, stress and smoking.”
“If you reduce those, you reduce the risks of heart attack,” he said. “Drinking a glass of water will not change all those.”
Fact-checking organizations Africa Check and Full Fact have also debunked similar misleading claims about timing water intake here and here.
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A meme posted on Facebook in Nigeria claims that drinking water at specific times of the day has health benefits that include preventing a heart attack
It says: “2 glasses after waking up helps activate internal organs. 1 glass 30 minutes before a meal helps digestion. 1 glass before taking a shower helps lower blood pressure. 1 glass before going to bed avoids stroke or heart attack.”
It is healthy to drink lots of water and keep our bodies hydrated – any time of the day. There’s no evidence that when we drink it gives water these specific curing powers.
Fact-checking site Hoax-Slayer has researched the meme’s advice and found it “doesn’t hold water, so to speak”.
And cardiac surgeon Dr A Marc Gillinov of the Cleveland Clinic in the US says “there is no data to suggest that ‘when’ you drink water matters. Choose water over most other drinks. But don’t schedule your drinking according to a fictitious claim.”
1 glass 30 minutes before a meal helps digestion?
A University of Washington article titled “Water myths debunked” says it “found no research backing up this claim”.
It quotes Dr Michael Rosenfeld, a lecturer in human metabolism, as saying he had “never heard of this claim” and concludes it is “likely a myth”.
In fact, drinking extra water isn’t needed for digesting food, at any time. Dr Braden Kuo of Massachusetts General Hospital in the US told news site Boston that “drinking water is not necessary for digesting food, because the body is very efficient at secreting and reabsorbing its own fluids”.
1 glass before taking a shower lowers blood pressure?
Hoax-Slayer warns that “drinking water before a bath or shower – or at any other time for that matter – does NOT lower blood pressure”. It quotes biomedical researcher Dr Judith Airey as saying that “generally, increasing the amount of water that is consumed will not increase the amount of sodium lost by the blood, so blood pressure will not be lowered”.
“In fact, drinking water can actually cause a very short term increase in blood pressure in some people, particularly those with some types of very low blood pressure. This is only temporary and has no long term impact on blood pressure.”
The University of Washington article concludes that this is also a myth.
It says: “Your blood pressure will not be affected because it is under the tight control of various hormones. If you are severely dehydrated and your blood pressure drops below the normal level, that system of hormones will cause you to feel thirsty. In the case of dehydration, drinking water will actually help increase blood pressure to a normal level.”
1 glass before going to bed avoids stroke or heart attack?
In an article examining bad advice for heart health, HuffPost says “most heart attacks occur in the day, generally between 6am and noon. Having one during the night, when the heart should be most at rest, means that something unusual happened”. So even without the glass of water, you would be unlikely to have a heart attack at night.
The University of Washington looked into recommendations on decreasing our risk of heart attack and stroke by the American Heart Association, US Centers for Disease Control and other US health organisations.
“These recommendations include keeping a healthy weight, staying physically active, eating healthy, managing stress, and refraining from smoking,” it says. “Drinking a glass of water before bed is not on the list.”
More than this, if you have to wake up in the middle of the night to go to the bathroom because you drank a lot of water before going to sleep, “this actually heightens your risk of heart attack and stroke because your sleep cycle is interrupted”.
So this advice is also a myth
It says: “2 glasses after waking up helps activate internal organs. 1 glass 30 minutes before a meal helps digestion. 1 glass before taking a shower helps lower blood pressure. 1 glass before going to bed avoids stroke or heart attack.”
It is healthy to drink lots of water and keep our bodies hydrated – any time of the day. There’s no evidence that when we drink it gives water these specific curing powers.
Fact-checking site Hoax-Slayer has researched the meme’s advice and found it “doesn’t hold water, so to speak”.
And cardiac surgeon Dr A Marc Gillinov of the Cleveland Clinic in the US says “there is no data to suggest that ‘when’ you drink water matters. Choose water over most other drinks. But don’t schedule your drinking according to a fictitious claim.”
1 glass 30 minutes before a meal helps digestion?
A University of Washington article titled “Water myths debunked” says it “found no research backing up this claim”.
It quotes Dr Michael Rosenfeld, a lecturer in human metabolism, as saying he had “never heard of this claim” and concludes it is “likely a myth”.
In fact, drinking extra water isn’t needed for digesting food, at any time. Dr Braden Kuo of Massachusetts General Hospital in the US told news site Boston that “drinking water is not necessary for digesting food, because the body is very efficient at secreting and reabsorbing its own fluids”.
1 glass before taking a shower lowers blood pressure?
Hoax-Slayer warns that “drinking water before a bath or shower – or at any other time for that matter – does NOT lower blood pressure”. It quotes biomedical researcher Dr Judith Airey as saying that “generally, increasing the amount of water that is consumed will not increase the amount of sodium lost by the blood, so blood pressure will not be lowered”.
“In fact, drinking water can actually cause a very short term increase in blood pressure in some people, particularly those with some types of very low blood pressure. This is only temporary and has no long term impact on blood pressure.”
The University of Washington article concludes that this is also a myth.
It says: “Your blood pressure will not be affected because it is under the tight control of various hormones. If you are severely dehydrated and your blood pressure drops below the normal level, that system of hormones will cause you to feel thirsty. In the case of dehydration, drinking water will actually help increase blood pressure to a normal level.”
1 glass before going to bed avoids stroke or heart attack?
In an article examining bad advice for heart health, HuffPost says “most heart attacks occur in the day, generally between 6am and noon. Having one during the night, when the heart should be most at rest, means that something unusual happened”. So even without the glass of water, you would be unlikely to have a heart attack at night.
The University of Washington looked into recommendations on decreasing our risk of heart attack and stroke by the American Heart Association, US Centers for Disease Control and other US health organisations.
“These recommendations include keeping a healthy weight, staying physically active, eating healthy, managing stress, and refraining from smoking,” it says. “Drinking a glass of water before bed is not on the list.”
More than this, if you have to wake up in the middle of the night to go to the bathroom because you drank a lot of water before going to sleep, “this actually heightens your risk of heart attack and stroke because your sleep cycle is interrupted”.
So this advice is also a myth
An infographic claims that drinking water at certain times of the day has certain health benefits.
The graphic reads:
“Benefits of drinking water at the correct time
2 glasses after waking up helps activate internal organs
1 glass 30 minutes before a meal helps digestion
1 glass before taking a bath helps lower blood pressure
1 glass before going to bed avoid [sic] stroke and heart attack.”
Variations of this claim have been shared on Facebook and across the internet thousands of times.
They’re broadly incorrect. While water is important for the human body, consuming it at certain times of day in specific quantities will not lead to any known health benefits.
We could not find any research that confirms drinking water after waking up “activates internal organs”. The statement is highly ambiguous as it does not define what “activate” means or which organs water is meant to activate; many bodily processes require water, so singling out organs is odd, as is the idea of “activating” organs—your organs should always be working.
That said, it is true that if you have not drunk water for several hours due to sleep and are thirsty, then drinking water will rehydrate you.
It is somewhat true that water helps with the digestion process. Water softens stool and helps prevent constipation. We’ve seen no evidence that drinking the water precisely 30 minutes before eating is necessary though.
We found no evidence that drinking a glass of water before a bath will lower blood pressure; in fact, there’s some evidence that drinking water slightly raises blood pressure for some people.
We could find no evidence that drinking water before bed affects your chances of having a heart attack.
There has been some research to suggest that fluid intake could help prevent coronary heart disease, and some to suggest that being dehydrated could inhibit stroke recovery, though we couldn’t find any evidence specifying that drinking water before bed, was particularly beneficial in either of these cases.
The graphic reads:
“Benefits of drinking water at the correct time
2 glasses after waking up helps activate internal organs
1 glass 30 minutes before a meal helps digestion
1 glass before taking a bath helps lower blood pressure
1 glass before going to bed avoid [sic] stroke and heart attack.”
Variations of this claim have been shared on Facebook and across the internet thousands of times.
They’re broadly incorrect. While water is important for the human body, consuming it at certain times of day in specific quantities will not lead to any known health benefits.
We could not find any research that confirms drinking water after waking up “activates internal organs”. The statement is highly ambiguous as it does not define what “activate” means or which organs water is meant to activate; many bodily processes require water, so singling out organs is odd, as is the idea of “activating” organs—your organs should always be working.
That said, it is true that if you have not drunk water for several hours due to sleep and are thirsty, then drinking water will rehydrate you.
It is somewhat true that water helps with the digestion process. Water softens stool and helps prevent constipation. We’ve seen no evidence that drinking the water precisely 30 minutes before eating is necessary though.
We found no evidence that drinking a glass of water before a bath will lower blood pressure; in fact, there’s some evidence that drinking water slightly raises blood pressure for some people.
We could find no evidence that drinking water before bed affects your chances of having a heart attack.
There has been some research to suggest that fluid intake could help prevent coronary heart disease, and some to suggest that being dehydrated could inhibit stroke recovery, though we couldn’t find any evidence specifying that drinking water before bed, was particularly beneficial in either of these cases.
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