Water is the source of life. Our bodies require daily hydration, as water permeates every part of us, transporting nutrients and accelerating metabolism. Thus, water is vital, and the water we drink daily matters greatly. Yet many people approach hydration casually, often consuming six common "toxic waters" that severely impact health. Do you know what these "toxic waters" are?
1. Avoid drinking tap water immediately after turning on the faucet in the morning
Experts state that tap water straight from the treatment plant is generally safe. This is because China's water treatment plant staff are predominantly postgraduate and doctoral graduates, possessing high levels of education and technical expertise. Additionally, the advanced equipment at these plants ensures the water's hygiene and safety.However, secondary contamination can occur during transportation through pipelines, water towers, and storage tanks. Why shouldn't you drink the first water from the tap in the morning? Because bacteria can multiply in the pipes overnight. Therefore, after waking up, let the tap run for about 5 minutes to flush out the stagnant water. The water that flows out afterward is relatively cleaner.Don't waste the drained water—use it for washing your face or cleaning. II. Drinking "Boiled-Over Water" Can Cause Poisoning Some people worry about water purity and boil tap water for over ten minutes before drinking it, creating what's known as "boiled-over water."Experts state this practice is incorrect. In some areas, tap water naturally contains higher mineral content. Prolonged boiling causes mineral elements to concentrate as water evaporates. For instance, while tap water may initially meet lead standards, prolonged boiling concentrates the water, causing it to exceed safety limits.Furthermore, tap water is disinfected with chlorine. When chlorine reacts with organic pollutants in the water, it forms disinfection byproducts (DBPs), classified as Group A carcinogens. The longer the boiling time, the higher the production of these harmful compounds. This explains why people traditionally avoided drinking water from steaming pots—reboiled water—as it contains these toxic byproducts.
How long should water be heated? Experiments show it's best to turn off the heat immediately after boiling. Boiling eliminates most bacteria; generally, except for spore-forming bacteria, other bacteria and viruses die at around 80°C.
III. Avoid drinking water left overnight
When boiled water sits for extended periods, nitrogen-containing organic compounds continuously break down into nitrites. Simultaneously, microbial activity inevitably accelerates this decomposition. The health risks of nitrites are well-documented: they strongly bind to hemoglobin in the blood, impairing oxygen transport and posing a carcinogenic risk.Therefore, boiled water should ideally be consumed within the same day.
Furthermore, while many households now rely on bottled water, even seemingly well-sealed containers should be emptied within three to four days. Once opened, bacteria can enter through the water inlet. Additionally, the negative pressure created when dispensing water from a dispenser inevitably draws in air, allowing airborne bacteria and microorganisms to infiltrate the container.If not consumed promptly, bacterial levels may exceed safety standards, rendering purified water no longer pure. Fourth, not all mineral water is suitable for drinking. Many people mistakenly believe that any mineral water is inherently good, leading some to collect spring water from mountains using containers. However, not all mineral water is safe for consumption.In some regions, such as the suburbs of Tianjin, mineral water contains high levels of fluoride. Although classified as mineral water, long-term consumption can lead to fluorosis and dental fluorosis, making it unsuitable for drinking. For natural mineral water intended for consumption, the state imposes strict regulatory standards, ensuring toxic metals and other minerals do not exceed permissible limits.
V. Water filtered by purification systems is not suitable for long-term consumption
Home water purifiers subject tap water to intensive processing. Their filtration mechanisms, containing materials like activated carbon, adsorb particles, bacteria, viruses, and other contaminants from tap water. Consequently, water treated by purifiers appears exceptionally clear—far clearer than tap water.However, this filtration process also removes beneficial minerals. While installing a water purifier is advisable for safety reasons, the resulting water lacks essential minerals and trace elements. Therefore, it is not recommended for long-term consumption, including bottled or桶装 purified water.
6. Bottled water stored long-term in car trunks is unsafe to drink
During manufacturing, plasticizers (also known as phthalates in Taiwan) are added to the raw materials of bottled water containers to aid molding. If water is stored for extended periods, some plasticizers may leach into the water, imparting a plastic taste.DEHP, a common plasticizer, is 20 times more toxic than melamine. Drinking just one 500ml cup of DEHP-contaminated water exceeds the daily intake limit. Therefore, overseas guidelines recommend storing bottled water in cool, dark places. Storing a case of water in a car trunk and retrieving it only when needed is incorrect practice.
Five Daily Moments When Water is Essential
1.After work
Drink a glass before leaving the office to increase satiety.
2. 2-3 hours before bedtime
Hydrating at this time dilutes blood and accelerates circulation.
3. Upon waking
Replenishes fluids lost overnight and helps prevent hypertension, cerebral hemorrhage, and cerebral thrombosis.
4. Before meals
Drink water about an hour before eating on an empty stomach to stimulate secretion of necessary digestive fluids, enhance appetite, and aid digestion and nutrient absorption.
5. Morning and afternoon work breaks
Take short breaks to hydrate during work hours.
4. Before meals
Drinking water on an empty stomach about 1 hour before eating ensures sufficient secretion of digestive juices, boosting appetite and aiding digestion and absorption.
5. During morning and afternoon work breaks
Replenishes fluids lost through sweat and urination, while also facilitating the smooth elimination of accumulated waste from the body.