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The other factor affecting how well a beverage hydrates relates to a drink's nutrient composition. For example, milk was found to be even more hydrating than plain water because it contains the sugar lactose, some protein and some fat, all of which help to slow the emptying of fluid from the stomach and keep hydration happening over a longer period. Milk also has sodium, which acts like a sponge and holds onto water in the body and results in less urine produced. The same can be said for oral rehydration solutions that are used to treat diarrhea. Those contain small amounts of sugar, as well as sodium and potassium, which can also help promote water retention in the body. "This study tells us much of what we already knew: Electrolytes - like sodium and potassium - contribute to better hydration, while calories in beverages result in slower gastric emptying and therefore slower release of urination," said Melissa Majumdar, a registered dietitian, personal trainer and sp...