When should you throw out old food?

How long has that bag of flour been in your cupboard? Is the quality of the flour still good? What about that jar of cinnamon in your spice rack or the half bottle of balsamic vinegar that you received last year as a holiday gift? Should you consume these foods or do your cupboards need a massive cleanup?
Our Nutrition and You Blogger, Joan Salge Blake, set out to find out the answers to these and other kitchen storage questions. Take her quiz to see if your kitchen pantry passes the cupboard clean up test.