Recognizing Dehydration and Why Not Drinking Enough Strains the Body.

Water serves many functions in the body. Among other things, it transports oxygen, nutrients, and metabolic byproducts. If fluid intake is too low, the composition of the blood changes, and the heart must therefore work harder to keep the circulatory system going. The body then tries to conserve water, and the kidneys produce less urine. The skin, too, can then only release less fluid.

Another important factor is temperature regulation. Normally, the body cools itself through sweating, but when the body is dehydrated, this process no longer functions properly. As a result, body temperature can rise more quickly. These are all adaptive responses, but they only help compensate for fluid loss in the short term. 

The signs of dehydration develop gradually and are therefore not noticed right away. Many symptoms are initially attributed to other causes. 

Typical signs of dehydration include, for example:

• a dry mouth and thirst
• headaches or a feeling of pressure in the head
• decreased concentration
• dizziness or unsteadiness
• dark, more concentrated urine

These symptoms often occur simultaneously and cause performance to deteriorate rapidly, without the person realizing that it’s actually due to dehydration.

As is well known, the body constantly loses fluid through the skin at high temperatures. This is how it regulates body temperature. This process is often underestimated. The situation becomes particularly critical when several factors come together. In the summer, almost every room is air-conditioned. Air conditioning dries out the air, causing the body to lose even more fluid in air-conditioned rooms. Hydration habits also play a major role. Many people “forget” to drink regularly. In the summer heat, this can quickly become life-threatening, especially for older adults and babies. 

When fluid volume decreases, it directly affects circulation. Blood pressure can become more unstable, and the brain receives a reduced blood supply for a short time. This can cause dizziness, lightheadedness, or weakness. In more severe cases, circulation can be so severely impaired that those affected have to sit down or feel as if they are about to faint. 

Not everyone reacts the same way to dehydration. Some groups are particularly vulnerable:

• older adults, who often have a reduced sense of thirst
• Children, whose fluid requirements are proportionally higher
• People engaged in physical exertion or sports
• People who drink very little or sweat heavily

In these groups, dehydration can develop more quickly and have more severe effects.

Dehydration can worsen rapidly and progressively. Mild cases can often be easily corrected, but if the fluid deficit persists, it becomes problematic.

Warning signs:

• significantly reduced urge to urinate
• severe weakness
• increasing confusion
• severe circulatory problems

In such situations, you should act quickly, because the body needs targeted support.

The most important thing is to drink enough throughout the day. It’s not very helpful to drink large amounts all at once; it’s better to drink smaller amounts regularly.

When we sweat heavily, the body loses not only water but also electrolytes. These minerals are essential for muscles and nerves to function properly. Drinking only water won’t fully restore this balance. That’s why it’s important to ensure a balanced fluid intake that also includes minerals. People with diabetes mellitus or other metabolic disorders, in particular, should make sure they stay adequately hydrated.

Being mindful of your own drinking habits is crucial:

• drink regularly, even when you’re not thirsty
• Place drinks where they’re visible
• Schedule regular breaks to drink
• Drink more fluids early on when it’s hot
• Adjust physical activity to the temperature

These simple measures help prevent dehydration.

Dehydration often develops unnoticed and only becomes apparent once the body is already under stress. Especially in the summer, fluid requirements can rise quickly. Those who make sure to drink enough early on and take the first signs seriously can keep their circulation stable and significantly improve their performance. If symptoms persist or circulatory problems recur, it may be advisable to consult a physician specializing in internal medicine.