Let us look into what scientific mechanisms are taking place inside our body. While Donguibogam spoke of 'qi and flow,' modern medicine explains this phenomenon through more precise biochemical mechanisms.
First, let us look at caffeine. Caffeine acts to interfere with adenosine receptors in the kidneys. Adenosine normally constricts blood vessels in the kidneys, reducing the blood volume directed there and promoting water reabsorption. However, when caffeine blocks this adenosine, renal blood flow volume increases, and the filtration rate of the glomerulus, which acts as a urine filter, rises. Simply put, the kidneys end up filtering water far more vigorously than usual. In addition, caffeine inhibits sodium reabsorption in the renal tubules of the kidneys, increasing the amount of sodium and water excreted in the urine. That is why a cup of coffee becomes the main culprit rushing us to the bathroom.
Next is alcohol. Alcohol induces a far more potent diuresis than caffeine. At its core lies the antidiuretic hormone (vasopressin) secreted by the pituitary gland. This hormone acts like a commanding officer ordering the kidneys to conserve water in our body, but alcohol strongly suppresses the secretion of this commander. When antidiuretic hormone cannot perform its role, the kidneys do not receive the order to conserve water and simply excrete fluids haphazardly. Consequently, the more alcohol you consume, the more rapidly urine volume surges, causing our body to lose even essential hydration. This is why you experience a hangover the morning after drinking, marked by intense thirst, a dry mouth, and a headache. It goes beyond simple water depletion; important electrolytes such as sodium and potassium are excreted together, disrupting the body's balance.
In this way, caffeine and alcohol disrupt our body's fluid balance and irritate the urinary bladder through different mechanisms. If symptoms of frequent urination or polyuria persist, the bladder muscles may become excessively tense or sensitive, and chronic dehydration can affect the function of every cell in our body, causing various issues such as fatigue, impaired concentration, and dry skin. Small daily habits were actually placing a larger burden on our body than expected. Now is the time to go beyond simply thinking 'I go to the bathroom often,' and to listen attentively to the signals your body sends, caring for it thoughtfully.
