The menus offered to children by most U.S. restaurant chains have too many calories, too much salt or fat, and often not a hint of vegetables or fruit, according to a study by the Center for Science in the Public Interest. The group, which has agitated for everything from healthier popcorn at the movies to calorie labeling in supermarkets, found that among almost 3,500 combinations surveyed, kids' meals failed to meet nutritional standards 97 percent of the time.