Yes It Can Be Done

And yes, it's Berkeley that's doing it. Why? Because parents and administrators there made it a priority. Check out this article in the SF Chronicle:

It took Candito [the District's Director of Nutrition] three years to find a handful of vendors willing to provide the nine-grain muffins, organic cereal and other fare that lives up to the groundbreaking food policy the district adopted last fall. The plan encourages employees to model healthy snack behavior and sends parents guidelines on how to pack nutritious lunches. It encourages eating locally grown food, with extra credit for eating produce grown in school gardens.

"Lots of district food directors want to take this path, but they don't have the support," Candito said. "At Berkeley, we have an integrated focus on physical education, school gardens, nutrition education and a commitment to healthy food in the cafeteria," Candito said.