Lack of water increases stress

The experts observed healthy young people who were divided into two groups: some drank less than 1.5 liters of liquid per day, while others adhered to the norm — about 2 liters for women and 2.5 liters for men. After a week of the usual routine, the participants were tested using a stress test that included a mock interview and mental arithmetic.

It turned out that both groups were equally nervous and felt a rapid heartbeat. But the difference was in the hormonal response. Those who drank little fluids had levels of cortisol, the main stress hormone, rising more than 50% higher than those who drank enough.

Interestingly, the participants themselves with low water intake did not feel particularly thirsty. But tests showed that their urine was darker and more concentrated, indicating latent dehydration.

The fact is that when there is a shortage of water, the body triggers a protective mechanism — it secretes vasopressin, which retains moisture and regulates kidney function. But the same hormone also affects the brain, increasing the production of cortisol. As a result, the stress response becomes more powerful and potentially more dangerous to health.

Scientists remind us that chronically elevated cortisol levels are associated with a higher risk of cardiovascular disease, diabetes, and even depression. Therefore, maintaining a normal level of hydration is not only about physical health, but also about stress tolerance.

You can check your hydration level simply by the color of your urine. A light yellow shade indicates that there is enough water, while a dark color hints at a lack of liquid.

And one more practical tip: if you have a busy day ahead, an important speech, or a deadline, it’s better to keep a bottle of water handy. This small step can help you cope with stress more easily and stay healthy in the long run.