The concept of 凉白开 is deeply embedded in Chinese culture and reveals a lot about traditional views on health and hygiene.
Health and Hygiene: For centuries, before reliable modern water treatment, boiling was the only effective way to kill harmful bacteria and pathogens in drinking water. This practice became a deeply ingrained habit passed down through generations, persisting even in cities with improved water infrastructure. It represents a cultural baseline for water safety.
Traditional Chinese Medicine (TCM): In TCM, the stomach and spleen are believed to function best with foods and drinks that are neutral or warm in temperature. Consuming ice-cold beverages (冰水, bīngshuǐ) is thought to “shock” the digestive system, hindering digestion and disrupting the body's natural energy flow (气, qì). 凉白开, being at room temperature, is considered the most gentle and harmonious option for hydration, aligning with the core TCM principle of maintaining balance.
Comparison to Western Culture: In America or Europe, asking for “a glass of water” will almost always get you chilled tap water, often with ice. It's the default and is seen as refreshing. In China, offering a guest iced water can sometimes be seen as thoughtless, especially to an older person or someone who is unwell. The default polite offerings are hot tea (热茶, rèchá), hot water (热水, rèshuǐ), or the neutral 凉白开. This small difference highlights a major cultural divergence in everyday wellness practices.