Ready-to-eat meals found in the prepared food aisle are a growing source of waste, as it is difficult to reuse meals that aren't sold but are fully cooked. Kristofor Husted/Harvest Public Media hide caption

itoggle caption Kristofor Husted/Harvest Public Media

The expiration date on foods like orange juice and even milk aren't indicators of when those products will go bad. iStockphoto.com hide caption

itoggle caption iStockphoto.com