水对人类赖以生存的重要性仅次于氧气。一个绝食的人失去全部脂肪以及半数蛋白质,还能勉强维持生命,但如断水,失去其体内含水量的20％,很快就会死亡,这就说明没有水的存在,任何生理过程都无法进行。 人体水的含量及其分布: 成人体重的50％～70％是水分,但与其胖瘦、性别、年龄不呈正比关系,女子体内含水量多于男子,年 Water is second only to oxygen for human survival. A hunger strike loses all fats and half of the protein and barely sustains life, but losing water, losing 20% ​​of its body water, will soon die, suggesting that no physiologic process is possible without water . Water content and distribution of human body: 50% to 70% of adult weight is water, but not proportional to their weight, weight, sex, age, the water content of the female body is more than that of the man,