A pedestrian sits on a wall in a file photo. If people keep gaining weight at the current rate, fat will be the norm by 2015, with 75 percent of U.S. adults overweight and 41 percent obese, U.S. researchers predicted on Wednesday. (Toby Melville/Files/Reuters)Reuters - If people keep gaining weight at the current rate, fat will be the norm by 2015, with 75 percent of U.S. adults overweight and 41 percent obese, U.S. researchers predicted on Wednesday.