Can I use cornmeal from 2013?

No, it is not recommended to use cornmeal from 2013. Cornmeal, like other grains, can become rancid over time due to its high oil content. Rancid cornmeal can have an unpleasant odor and taste, and it may also contain harmful bacteria. It is always best to use cornmeal within its recommended shelf life for safety and the best quality.