With each new heat waveThe body constantly loses water through sweat and respiration, even when not performing intense physical exertion. This sustained loss, if not properly compensated for, can lead to dehydration. mild but continuous dehydration which easily goes unnoticed and gradually undermines well-being day by day. This phenomenon, known as silent dehydrationIt becomes especially worrying when temperatures soar, because increases the risk of heatstroke and other complications. In Spain and the rest of Europe, where summers are becoming increasingly extreme, and in the face of measures such as climate shelters and cooler citiesExperts insist that it is not enough to drink only when thirst appears.
This phenomenon, known as silent dehydrationIt becomes especially worrying when temperatures soar, because increases the risk of heatstroke and other complications. In Spain and the rest of Europe, where summers are becoming increasingly extreme, experts insist that it is not enough to drink only when thirst strikes.
What is silent dehydration during a heat wave?
During the episodes of intense heatThe body continuously eliminates fluids to regulate its internal temperature. Water and electrolytes are lost through sweat, urine, and respiration, a process that intensifies when walking on the street, using public transportation, or simply being in hot environments.
When those losses are not adequately replaced, a mild but sustained dehydration It may not cause any noticeable symptoms at first. There isn't always intense thirst to alert you to the problem, so many people continue with their routine without realizing that their body is functioning with a water deficit.
Cardiovascular health and internal medicine specialists point out that this situation is more common during the prolonged heat waves, when several days of very high temperatures follow one another and the body does not fully recover from one day to the next.
Under these conditions, so-called silent dehydration becomes an added risk factor for suffering from heat stroke. dizziness, drops in blood pressure, intense fatigue and even decompensation in people with pre-existing conditions.
Who are the most vulnerable to silent dehydration?
Experts agree that not everyone copes with a heat wave in the same way. There are groups in which the The sensation of thirst is less reliable or whose fluid needs are greater, so silent dehydration occurs more frequently.
First, they highlight the childrenYoung children, especially babies, have a higher percentage of body water and lose fluids more quickly. Furthermore, they depend on adults to offer them drinks frequently, so it's easy for them not to get enough water on extremely hot days.
Another key group are the older adultsWith age, the mechanism that triggers the sensation of thirst becomes less effective, so an older person can be dehydrated without feeling thirsty. If this is compounded by the fact that many take diuretics or other medications that affect fluid balance, the risk of silent dehydration increases significantly during heat waves.
People who spend many hours outdoors or in very hot places are also particularly at risk: construction workers, delivery drivers, agricultural workers, people who do intense outdoor sports, or those who live in poorly ventilated homes. In these cases, the water loss through sweat It is constant and, if not accompanied by adequate replenishment, the body enters into a water deficit without it always being immediately noticeable.
Health professionals also remind us that those who suffer chronic diseasesThose with dermatological problems or a history of heat stroke should be extra vigilant about their hydration, as they can become more easily decompensated when temperatures rise significantly.
Early signs of dehydration that should not be ignored
One of the ideas that experts repeat most often is that the thirst is not a completely reliable indicator.When that feeling appears strongly, the body has usually been dehydrated for some time. Therefore, it's recommended to observe other, more subtle signs that may indicate dehydration in progress.
A key clue is the urine colorVery dark or concentrated tones can be a sign that the body needs more fluids, while a lighter color is usually associated with adequate hydration. Monitoring this throughout the day is helpful for adjusting the amount of water you drink.
La dry mouthA coated tongue or the feeling of needing to constantly drink small amounts of liquid are other common signs. Many people attribute these symptoms to the heat or air conditioning, but they can indicate sustained water loss.
Early signs are also considered to be constant tirednessDifficulty concentrating, mild dizziness upon standing, or a feeling of weakness without apparent cause. In the context of a heat wave, these symptoms should raise suspicion of dehydration, especially if accompanied by headache or general malaise.
In cases where dehydration progresses and becomes more severe, the following may appear: very intense thirsttachycardia, dry skin, a noticeable decrease in the amount of urine and even disorientation or confusion, conditions that already require rapid medical attention to rule out heat stroke or other serious complications.
The role of nutrition in hydration during extreme heat
The way you eat in summer directly influences how your body copes with high temperatures. Nutritionists recommend opting for a light and water-rich diet, which facilitates digestion and prevents metabolic overload during a heat wave.
Foods with high caloric density And many saturated fats, such as those found in fatty meats, sausages, or dishes with heavy sauces, force the body to work harder during digestion. This extra effort can increase the feeling of heat, cause heaviness, and contribute to general exhaustion when the temperature is soaring.
Something similar happens with the fried foods and very elaborate dishesCooked with a lot of oil, they are more difficult to digest and can cause digestive discomfort, gas, and intestinal upset. On extremely hot days, these types of foods not only make you feel worse, but they also do nothing to help you stay properly hydrated.
Instead, it is advisable to give prominence to fresh fruits and vegetablesThese fruits provide water, vitamins, fiber, and minerals. Watermelon, melon, red fruits, cucumber, zucchini, peppers, and celery, among others, help meet some of our fluid needs and contribute to making meals lighter and more refreshing.
The lean proteinFoods like fish, skinless chicken, or legumes prepared in cold salads are easier on the digestive system when the heat is intense. Combining them with vegetables and mild dressings helps conserve energy without overloading on heavy dishes that could worsen the feeling of discomfort.
Drinks that hydrate and drinks that can work against you
Not all drinks consumed in summer actually help with hydration. During heat waves, it's common to turn to very cold soft drinks, sugary beverages, or alcohol, but experts emphasize that, in many cases, these options can be harmful. worsen silent dehydration.
The high sugar drinksDrinks like some sodas or processed juices promote increased urination and do not provide the same quality of hydration as water. Furthermore, their excessive consumption is associated with other health problems that worsen in prolonged heat.
El alcohol It also has a diuretic effect and contributes to the loss of fluids and electrolytes. Drinking alcoholic beverages during a heat wave, especially if you are in the sun or combine it with physical activity, increases the risk of dehydration without you noticing it in time.
Drinks with caffeineLike some energy drinks, they can also increase urine production and are not the most recommended option when the goal is to maintain constant and safe hydration, especially in children and the elderly.
Health professionals advise prioritizing the consumption of high-quality, low-sodium water as your main beverage throughout the day. In situations of intense heat and heavy sweating, it may be helpful to occasionally use electrolyte drinks, but always avoiding excess sugar and without replacing water as the basis of daily hydration.
Daily habits to prevent silent dehydration
Beyond what you eat and drink, the key is to incorporate a series of simple routines that help prevent silent dehydration during heat waves, both at home, at work, or on the street.
One of the most repeated recommendations is drink water regularly Drink throughout the day, without waiting until you're thirsty. Always having a bottle handy and taking small sips every so often makes it easier to drink enough.
Observing the color of urine from time to time allows adjust the amount of liquids that are being taken. If you notice that the tone is darkening, it may be a sign that you need to increase your water intake or introduce more water-rich foods into your meals.
On days marked by a heat wave, specialists recommend increase fluid intake Before, during, and after any physical activity, even if it's not particularly intense. Something as everyday as walking for a few minutes in the sun or carrying shopping bags can lead to a considerable loss of water.
Emphasis is also placed on the need to closely monitor children and the elderlyOffer them water frequently and remind them to drink, as they are not always aware of their own thirst. In family settings, care homes, or day centers, it is important to establish fixed drinking times, even if everyone appears to be well.
Lastly, keep the home as cool as possibleVentilating at appropriate times and avoiding direct sun exposure during the middle of the day helps the body lose less water and tolerate heat better, thus reducing the risk of entering a state of silent dehydration.
With summers getting hotter, learning to recognize the subtle signs of dehydrationChoosing the right foods and drinks and reinforcing simple hydration habits has become a fundamental tool for self-care. Paying attention to children, the elderly, and those exposed to the sun, prioritizing water over other beverages, and planning a cooler, lighter diet allows us to get through heat waves more safely and reduces the chances that silent dehydration will lead to more serious health problems.
