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A professor of medicine at the University of Pennsylvania,"There really isn't data to support this." I think unfortunately, they're not basing this on really hard science. It's not a very scientific approach they've taken to make it a major public health effort. The idea drinking water increases energy, the world I've used to describe it is quixotic. We're designed to drink when we're thirsty. There's no need to have more than that. The White House and its experts say too many Americans aren't drinking nearly enough water. The director of the National Center for Chronic Disease Prevention and Health Promotion with the centres for Disease Control and prevention, said drinking water has many positive benefits. Drinking water can help people maintain a healthy weight and may be an important strategy for preventing obesity. Even mild levels of dehydration may result in decreased concentration, alertness, and short-term memory among children and adults as well as diminished athletic performance. To remind families of the importance of drinking water, supporters of PHA's effort will carry the Drink Up logo on nearly 300 million packs of bottled water, more than half a billion bottles of water, 200,000 packages of reusable bottles, and more than 10,000 reusable bottles in the next year. Sam Kass, executive director of "Let's Move," the first lady's anti-childhood obesity initiative, cited US statistics showing that about 40 per cent of people drink less than half the typically recommended eight cups of water a day and that about one-fourth of kids below age 19 don't drink any plain water at all on any given day.