RATING: đś Partially Reliable đś
I want to note at the start that this post tends to use âdehydrationâ and 'not drinking enough waterâ interchangably. It is possible to stay hydrated without drinking plain water - in fact, water is not the most hydrating drink.
Throughout my fact check, I will be charitable and assume that the author is referencing dehydration and not a lack of drinking water specifically - but I wanted to note that the phrasing is misleading, as the two are not the same thing.
From a CNN article on hydration: 'The researchers found that while water â both still and sparkling â does a pretty good job of quickly hydrating the body, beverages with a little bit of sugar, fat or protein do an even better job of keeping us hydrated for longer.â
Iâve found no evidence that drinking less water, or even general dehydration can lead to hypoxemia (low blood oxygen levels). However, feeling tired is a symptom of dehydration.
From NHS page on dehydration: 'Symptoms of dehydration in adults and children include: [âŚ] feeling tiredâ
Water makes up for about 75% of brain mass, not 85%.
From a News Medical article on hydration and cognitive function: 'The brain, compared to the rest of the body contains more water mass, approximately 75% of all brain mass is water.â
Headaches are symptom of dehydration. However, the connection here is false, as the brain itself is has no pain receptors.
From a BHF article on hydration: 'Other signs of dehydration include: [âŚ] headacheâ
From a Science Focus article on headaches: 'it might surprise you to know that headaches donât originate from the brain itself. We can find nociceptors in the skin, in the joints and in some internal organs, but curiously not in the brain. So the brain itself doesnât feel pain.
Even though the brain cannot perceive pain, its surroundings, such as the meninges (the covering of the brain), nerve tissues, blood vessels, and neck muscles, can.â
There is insufficient evidence that drinking water directly increases weight loss.
From a Healthline artice on weight loss and water consumption: 'Drinking water can help burn calories and reduce hunger cravings. Replacing sugary drinks with water can also lower caloric and sugar intake. But there isnât enough evidence that water itself can help you lose weight.â
I have not found evidence of a direct link between dehydration and indigestion. However, swapping out drinks like tea, coffee, and soda for water may improve symptoms.
From a paper on berage intake and GER symptoms: 'intake of coffee, tea, or soda was associated with an increased risk of GER symptoms. In contrast, consumption of water, juice, or milk was not associated with GER symptoms. Drinking water instead of coffee, tea, or soda reduced the risk of GER symptoms.â
Whilst the phrasing here is a little unclear (lubcrication would be more correct than 'fuelâ), it is true that dehydration can cause joint pain, particularly in those already prone to it.
From a Orthopedic Associates article on dehydration and joint pain: 'Dehydration can cause joint pain because of the lubricating effect it has on the joints. Itâs estimated that 70 â 80% of your joint cartilage consists of water.
Dehydration is a risk factor for constipation. However, as previously mentioned, water consumption is not directly linked to weight loss. Furthermore, not drinking enough does not cause 'toxin build-upâ. It is true that chronic constipation can cause complications.
From a Healthline article on dehydration and constipation: 'Dehydration can cause constipation by resulting in dry and hard stools that are difficult to pass. It can also lead to other effects, such as diarrhea and bloating.â
From a Smithsonian article listing common myths about kidneys: âDrink at least six to eight glasses of water to detox. Weâve heard this over and over again. But there is little scientific evidence to support it. All that chugging a lot of water does is increase the volume of urine that you excreteâ
From a Healthline article on chronic constipation: 'Over time, if you regularly experience constipation, youâre at risk for certain complications.â
Iâve struggled to find reputable sources to clarify dandruff statement. However, I would first note that 'dry scalpâ and 'dandruffâ are used interchangable, when they are in fact two different conditions.
The best I could find regarding the effect of dehydration is an article from Head and Shoulders, a shampoo brand. This suggests that dehydration cannot cause dandruff, but that it can worsen dry scalp.
From a Healthline article on dandruff and dry scalp: 'Dandruff and dry scalp have the same main symptoms of falling flakes and an itchy scalp, but theyâre two different conditions.â
From Head and Shoulders: 'Dehydration wonât cause dandruff â but that doesnât mean theyâre not linked. [..] We know the reason for dandruff, but dehydration and its effect on the scalp can make the problem far worse.â
Dehydration can affect skin quality, though I would clarify that skin may become dry despite being hydrated.
From a Healthline article on dehydrated skin: 'Dehydrated skin may be dry and itchy with an overall tone and complexion that may appear uneven or dull, and more noticeable fine lines.â
Dry mouth may be caused by dehydration.
From a NHS page on dry mouth: 'The main causes of a dry mouth are: dehydration â for example, from not drinking enough, sweating a lot or being illâ