Every book I read says don't buy anymore food than you can use in 3 weeks. That it loses freshness and nutrition. Well, I bought some feed last month from the feed store. I use Purina Layena. It was a brand new shipment, cuz I had to go back after the truck came at noon. I looked at the date stamp on the bag where they sew it closed, and it said Jan 2007. It was a whole year old! Doesn't it lose it's freshness in that year? Why do I have to worry about not buying more than I can use in 3 weeks, if they are going to sell year old food?