When you are busy working all day sitting down, it can be difficult to drink even a glass of water properly. However, if you are dehydrated, your concentration and judgment can drop sharply, and fatigue builds up. Even a 2% decrease in body water can slow down blood circulation and cause immediate changes in metabolism and skin health. Water is not just a simple beverage; it is a fundamental substance needed to drive all functions of our body. If you frequently experience the signals below, you may already be in a state of 'dehydration.'
Your head feels foggy and you can't concentrate
When you are dehydrated, your blood becomes sticky, reducing the oxygen supply to the brain. At this time, headaches and a foggy feeling can recur, which can easily be mistaken for simple fatigue. In dry indoor environments, the rate of dehydration progresses faster. Drinking small amounts of water frequently can effectively prevent a decline in concentration. According to a study from Loughborough University in the UK, even mild dehydration can reduce work concentration by up to 20%.
Your hands and feet are cold and you feel easily fatigued
When water decreases, blood circulation worsens, causing peripheral body temperature to drop. Your hands and feet become cold, your muscles stiffen, and by the afternoon, overall fatigue intensifies. In offices with frequent heating and cooling, 'routine watering (a sip of water every hour)' is essential. Water smooths blood flow and helps eliminate fatigue substances, aiding in energy recovery. When tired, a glass of lukewarm water is more effective for recovery than coffee.
Your face feels tight and your lips are chapped
When body water decreases, the skin's moisture retention ability drops, causing the stratum corneum to crack easily. Even with makeup, it can flake off, and even with lip balm, it can crack quickly due to 'internal dryness' of the skin. Under air conditioning or heating, moisture loss doubles. Drinking 6 to 8 glasses of water at regular intervals can restore the skin barrier and maintain elasticity. Keeping indoor humidity at 50-60% also helps.
Your urine is dark and the frequency decreases
When dehydrated, the kidneys concentrate urine to preserve body water. Dark or strongly smelling urine is already a sign of dehydration. The ideal urine color is light lemon, and urinating 5 to 7 times a day is normal. Holding in urine frequently increases the risk of urinary tract infections and stones. Office workers who sit for long periods should consciously replenish water in small sips after meals or before and after meetings.
Indigestion, bloating, and constipation occur
Water activates digestive enzymes and aids intestinal movement. In a dehydrated state, food stays in the intestines longer, accumulating toxins and gas. At this time, indigestion, abdominal bloating, and constipation become frequent. A glass of lukewarm water 30 minutes before meals stimulates the stomach and aids digestion. However, drinking excessive water during meals can dilute stomach acid and hinder digestion. A total daily water intake of at least 1.5L is recommended.
When and how should you drink water optimally?
It is better to drink water at regular intervals rather than drinking a lot at once, such as right after waking up, before morning concentration, after lunch, during afternoon fatigue times, and before leaving work. Lukewarm water has a high absorption rate in the body and does not burden the stomach. Generally, the recommended daily amount is body weight (kg) × 30ml, and at least 1.5L is needed even including moisture from food. Consistent water intake is the simplest and most powerful health habit that protects fatigue recovery, immunity, and skin health simultaneously.
