WASHINGTON — Eating healthy food isn't always cheap, and some conservatives in Congress are concerned that the Obama administration's effort to make school lunches more nutritious is a luxury the nation can't afford.Many schools, especially the poorest ones, agree. They say new rules issued by the Agriculture Department in January will require them to buy pricier foods and more equipment at a time when federal and state budgets are tight and food costs are rising.Read More... More on School Lunches