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一个人对液体的需求因体重,年龄,运动量,体温和周围的气温而异。在一般的情况下一个成年人为正常排除废物和体内组织所需的水约为每日2.5升。大部分水是以饮料的形式摄入的;有些是食物中原有的水分,极少部分是由新陈代谢过程产生的。食物中原有的水分量约为700毫升。牛奶中含有87%的水分,一些水果和蔬菜中的水分超过90%。甚至谷物中也有微量水分。总计,固态食品提供40%所需的液
A person’s need for liquids varies according to weight, age, amount of exercise, body temperature and ambient temperature. Under normal circumstances, an adult would normally need about 2.5 liters per day to properly dispose of waste and body tissue. Most of the water is taken in the form of drinks; some are the original moisture in the food, and very few are produced by the metabolic process. The original amount of water in the food is about 700 ml. Milk contains 87% moisture, some fruits and vegetables more than 90% moisture. There are even traces of moisture in the grain. In total, solid food provides 40% of the required liquid