There are days when we reach the afternoon and realize we have barely drunk any water. A coffee in the morning, perhaps a glass with lunch and little else. And, although thirst seems the most obvious signal, the body may start noticing the lack of fluids long before we seriously consider hydrating.
The human body is composed of roughly 70% water and constantly loses fluids through urine, sweat, and even breathing. Therefore, maintaining adequate hydration is important for the body to function normally.
But how can we tell if we are drinking enough? Beyond counting glasses, there are some signs that are quite easy to recognize.
You have a dry mouth and thirstier than normal
It may seem obvious, but thirst is one of the first signals the body uses to request fluids.
If you notice dry mouth on a regular basis or have a thirst that doesn’t go away, it could be a clue that you need to drink more.
Additionally, mouth dryness can affect the oral mucosa and its natural defenses.
Your urine is darker than usual
This is probably one of the simplest indicators to observe in daily life.
When we don’t ingest enough fluids, urine becomes concentrated and can take on a darker yellow hue. By contrast, pale yellow urine is typically associated with adequate hydration.
So yes: a trip to the bathroom can also give you a clue about how much you have drunk that day.
You have a headache or feel dizzy
A headache or a feeling of dizziness can also appear when dehydration is present. The lack of fluids can reduce blood volume and affect the flow of blood and nutrients reaching the brain.
That said, if headaches or dizziness are frequent, intense, or do not go away, it’s not advisable to automatically attribute them to drinking too little water: it’s advisable to consult with a healthcare professional.
You are more tired and find it hard to concentrate
Do you reach mid-afternoon and feel like your brain is running on half speed? Fatigue and difficulties concentrating can be other signals linked to insufficient hydration.
It isn’t always a matter of sleep deprivation. In some cases, drinking very little during the day can also contribute to that sense of tiredness and lack of concentration.
Your skin and lips are drier
The dry lips and a skin that looks more dull are other signs that can appear when there is a lack of fluids.
There is even a well-known home test: gently pinching the skin on the back of the hand and observing how long it takes to recover its position. A particularly slow rebound can appear in cases of dehydration, although this test alone does not allow for diagnosis.
Your under-eye area appears more pronounced
Hydration can also influence the appearance of the area under the eyes. When fluids are lacking, dark circles can become more noticeable and lend the face a tired look.
However, dark circles have many other causes—from genetics to lack of sleep—so they should not be interpreted as a definitive sign of dehydration.
You have constipation
There is a signal that perhaps we don’t immediately associate with drinking water: constipation.
When liquid intake is insufficient, the intestine can absorb more water from the stools, making them drier and harder to expel. Therefore, proper hydration is also part of habits that help maintain normal bowel movement.
How much water do you really need?
There is no identical amount that suits everyone. Fluid needs depend on factors such as diet, physical activity, climate, and individual characteristics.
As a general reference, people often talk about around 1.5 liters of water per day, although total fluid needs can be higher and part of the water we need comes from foods, especially fruits and vegetables.
Therefore, rather than obsessing over an exact figure, it is wise to pay attention to your body’s signals and maintain an adequate fluid intake throughout the day.
The next time you notice a dry mouth, feel more tired than usual, or find that your urine has a noticeably darker color, perhaps your body isn’t being subtle: it may be asking you for a glass of water.
