Not an article, but rather a movement - Yale's Rudd Center's page on parent advocacy for healthy school food!
Far be it from me not to link to good stuff too - Dr. Oz' Time Magazine article praised by Harriet Hall over at Science Based Medicine (this one ain't about apple juice fear mongering)
Harvard comes out swinging and releases the Healthy Eating Plate, their own, evidence-based, version of the USDA's MyPlate