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来自欧洲一份最新研究显示，对于欲补充水分的民众，喝纯水并非最佳选择，反而是喝下含有少量糖、脂质或蛋白质的饮料将协助人体更加保水。

根据《CNN》报道，由苏格兰圣安德鲁斯大学(Scotland’s St. Andrews University)研究团队发表的报告，刊登在最新一期的《美国临床营养学杂志》(the american journal of clinical nutrition)，科学家发现，尽管纯水对于迅速补充人体水分具有良效，但若考量到“保水”能力，含少量糖、脂质或蛋白质的饮料则优于纯水。

研究主要作者，圣安德鲁斯医学院的莫恩教授（Ronald Maughan）指出，此原理与人体对水溶液中不同浓度的溶质会有不同程度的反应有关。

简而言之，若大量喝下纯水，水分从胃部进入血液的速度虽快，但由于渗透压的改变，保留水分子的难度也将上升；反之若喝下牛奶，牛乳中的乳糖、脂质及微量元素将有助减缓胃液排空并保持较长时间的水合作用，进而增长“持续吸收水分”的时间。

营养师表示，这与常被用于治疗腹泻的口服补液溶液原理相同，口服补充液含有少量糖、钠及钾等电解质，可协助促进人体保留水分。

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