When Annette Evanson sends her son off to elementary school each day, she packs him a lunch stocked with carrot sticks, whole-grain bread and fresh fruit. She considers it a defensive move. "They serve the kids corn dogs and hot dogs at school," said Evanson, who lives in suburban Overland Park, Kansas. "It just mimics fast food. What kind of example are we giving to the kids?" Indeed, concerns about unhealthy eating at schools and evidence of mounting obesity and illness in America's young people has triggered a new kind of food fight in U.S. school cafeterias.