“People who are drinking bottles and bottles of water in between meals and with no food, they’re probably just peeing most of that out,” Nieman says. Ingesting water along with amino acids, fats and minerals seems to help the body take up and retain more H2O-and therefore maintain better levels of hydration-which is especially important following exercise and periods of heavy perspiration. These include a drink’s nutrient content, as well as the presence of “diuretic agents,” which increase the amount of urine a person produces. But the authors of the 2015 study wrote that there are several “elements of a beverage” that affect how much H2O the body retains. So are sports drinks, beer, and even coffee, to some extent. Of course, no one’s suggesting that people dump water in favor of milk and OJ. (Lager was a little less hydrating than water, but a little better than coffee.) For a 2015 study in the American Journal of Clinical Nutrition, researchers compared the short-term hydration effects of more than a dozen different beverages-everything from plain water and sports drinks to milk, tea, and beer, to a specially formulated “rehydration solution.” Based on urine analyses collected from the study volunteers, the researchers concluded that several drinks-including milk, tea, and orange juice, but not sports drinks-were more hydrating than plain water.
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