NEW YORK (Reuters Health) - The number of U.S. children who drink sugar-free beverages has doubled in the past decade, a new study finds - though the health implications of the trend, if any, are unclear. Using data from a federal health survey, researchers found that by 2008, 12.5 percent of children were drinking artificially-sweetened beverages. That was up from six percent a decade earlier. U.S. adults are downing more diet drinks too. ...