From The Los Angeles Times: School districts in Los Angeles, New York, Chicago, Dallas, Miami and Orlando, Fla., plan to use their collective influence — 2.5 million daily meals served and $530 million annually spent — to make wholesome food a national standard. The districts are also aiming for more eco-friendly practices — replacing polystyrene and plastic with biodegradable trays and flatware, for instance. As such diet-related maladies as diabetes and obesity increase among children, the quest to reduce fat, sugar and sodium in school meals has gained new urgency among districts.