互联网上掀起的"喝大水"热潮引发广泛关注。1上海疾控部门发布健康提醒，指出短时间内过量饮水可能引发稀释性低钠血症，俗称"水中毒"。1轻症表现为恶心呕吐、头痛乏力、注意力不集中，严重情况可能危及生命。1
关于饮水量，疾控部门澄清了长期流行的"每天8杯水"说法。1这一建议最早源自1945年的美国营养指南，但原建议明确指出大部分水分已包含在日常食物中。1《中国居民膳食指南（2022）》给出了更科学的参考标准：低身体活动水平的成年男性每天水的适宜摄入量为1700毫升，女性为1500毫升。1
科学补水应根据身体实际需求调整。1疾控部门建议采取少量多次的方式，每隔1-2小时饮用一杯水为宜。1可以通过尿液颜色判断水分状况：淡柠檬黄色表明水分充足，深黄琥珀色提示明显缺水，乌龙茶色则可能示警严重缺水。1对于运动出汗的人群，可在日常基础上额外增加500-1000毫升的饮水量。1
An internet trend encouraging excessive water consumption has prompted health authorities to issue cautions about the dangers of overhydration. Shanghai disease control officials released guidance warning that consuming large quantities of water in a short period can lead to "water intoxication," medically known as dilutional hyponatremia.1
The widely circulated advice to drink eight glasses of water daily originated from a 1945 American nutrition recommendation, though that original guidance specified that most water intake comes from food sources.1 Current Chinese dietary standards provide more nuanced guidance, with the 2022 Chinese Residents' Dietary Guidelines recommending daily water intake of 1,700 milliliters for adult men with low physical activity levels and 1,500 milliliters for women with low physical activity levels.1 Health officials emphasized that appropriate water consumption should be tailored to individual needs rather than following a fixed formula.
Consuming excessive amounts of pure water rapidly can trigger dilutional hyponatremia with symptoms ranging from nausea, vomiting, and headaches to fatigue and difficulty concentrating in mild cases, potentially progressing to life-threatening conditions in severe instances.1 Shanghai health authorities provided practical guidance for safe hydration: drinking small amounts at intervals of one to two hours, and increasing intake by 500 to 1,000 milliliters during or after sweating from physical activity.1 Officials also recommended using urine color as an indicator—pale lemon yellow signals adequate hydration, dark amber suggests dehydration, and tea-colored urine indicates possible severe dehydration.1
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