The latest target in the battle over fast food is something you shouldn't even put in your mouth. Convinced that Happy Meals and other food promotions aimed at children could make kids fat as well as happy, county officials in Silicon Valley are poised to outlaw the little toys that often come with high-calorie offerings. The proposed ban is the latest in a growing string of efforts to change the types of foods aimed at youngsters and the way they are cooked and sold. Across the nation, cities, states and school boards have taken aim at excessive sugar, salt and...