Water constitutes 70% of Earth's surface and 70% of the human body. This remarkable coincidence underscores water's vital importance to our health. Yet in daily life, we often agonize over meal choices while giving little thought to drinking water.Most people assume drinking water is the simplest thing—just grab a cup and gulp it down, right? In reality, the science behind hydration goes far beyond that. When you drink and how much you consume significantly impact your health.
Different Approaches for Different People
People with colds: Drink more water.A January 21, 2011 New York Times article noted that drinking extra water or pure fruit juice during a cold aids recovery by helping flush mucus from the respiratory tract, making breathing easier. Additionally, when feverish, the body's self-protective mechanism triggers cooling responses like sweating, rapid breathing, and increased skin evaporation—all signs of accelerated metabolism requiring substantial fluid replenishment.Drinking more water not only promotes sweating and urination but also aids in regulating body temperature and expediting the expulsion of pathogens.
For those with constipation: Drink water in large gulps. Simply put, constipation stems from two causes: first, accumulated waste in the body due to insufficient hydration; second, a loss of excretory function in organs like the intestines.Drinking water in large gulps and swallowing quickly allows water to reach the intestines faster, stimulating peristalsis and promoting bowel movements. Traditional Chinese medicine attributes constipation partly to insufficient bodily fluids. Drinking water in large gulps rapidly replenishes these fluids, thereby stimulating intestinal movement and facilitating bowel movements.Chen Xiafei, Chief Nutritionist at Shanghai East Hospital's Nutrition Department, recommends that individuals with constipation supplement their water intake with dietary fiber for optimal results. Therefore, it is best to drink a glass of high-fiber vegetable juice daily.
For overweight individuals: Drink a glass of water before and after meals. Many chemical reactions within the human body occur in water.Adequate hydration ensures the body's metabolic systems function properly. For those who are overweight, drinking a small glass of water about half an hour before meals can increase feelings of fullness. Drinking another small glass half an hour after meals aids digestion and helps maintain a healthy weight.To prevent dehydration after severe vomiting or diarrhea, drink a small amount of lightly salted water to replenish energy and alleviate weakness. How Office Workers Should Hydrate Detoxification: A glass of water in the morning. Many know morning hydration benefits health. After overnight metabolism, bodily waste requires external assistance to be expelled—water serves as the optimal "cleansing agent."At this time, cells act like dry sponges, absorbing the water and expelling waste within about 40 minutes. This is a crucial detoxification process. Diluted salt water, honey water, or plain boiled water are all excellent choices for morning hydration. Experts advise against drinking water that is too cold or too hot in the morning; a temperature around 40°C (104°F) is ideal.
Irritability: Drink More Water.The brain produces endorphins, known as "feel-good hormones," while adrenaline is often called the "pain hormone." When someone feels distressed or irritable, adrenaline surges. Like other toxins, it can be expelled from the body—one effective method being increased water intake. Physical exertion helps eliminate adrenaline through sweat, or crying can expel it via tears.
Stress Relief: Drink water before making decisions. Research from the University of East London found that students who drank water before exams showed improved cognitive function and performed better. For office workers, drinking water before high-pressure situations or decision-making helps clear the mind.
Not Thirsty? Drink Anyway.A Hong Kong Department of Health survey found one-third of adults drink fewer than six cups of water daily. Busy office workers often go half a day without a sip. The U.S. Water Health website notes that by the time thirst is felt, the body has already lost at least 1% of its water. Thus, office workers should establish good hydration and urination habits: drink water every hour and urinate every 2–3 hours.
How Should Seniors Drink Water?
Before bed: Sip a couple of mouthfuls. During deep sleep, bodily fluid loss reduces blood water content, increasing blood viscosity.Drinking a small amount of water before bed can reduce blood viscosity, thereby lowering the risk of cerebral thrombosis. Additionally, during dry autumn and winter seasons, water helps moisten the respiratory tract, promoting better sleep. However, be mindful not to drink excessively before bed. Elderly individuals often have the habit of getting up at night, and if drinking water disrupts sleep, it may not be worth the benefit.
After bathing: Drink water slowly.Many people feel thirsty after bathing and tend to drink a full glass in one go. Experts emphasize that the elderly have weaker constitutions and less robust cardiac endurance than younger individuals. Especially after a hot bath, when the body is heated, blood vessels dilate, blood flow increases, and the heart rate is faster than usual, drinking water requires particular caution. It is best to drink a cup of warm water slowly in small sips; otherwise, it can easily increase the burden on the heart.
After exercise: Drink in sync with your heartbeat. Elderly individuals should also avoid large amounts of water immediately after physical activity. At this time, the blood vessels in the gastrointestinal tract are contracted and require a recovery period. Drinking large quantities of water right away can cause fluid to accumulate in the stomach and intestines, leading to bloating and impaired digestion.It's best to wait a few minutes until the heartbeat stabilizes before drinking warm water in small sips. Maintain a steady pace while drinking, ideally matching the frequency of your heartbeat, and take intermittent breaks between sips. This allows the heart to absorb the water entering the body in a regular and steady manner.