There are many handy apps available these days to help you decide which foods are the healthiest and most sustainable to purchase at the grocery store. And most are free! My favorite is this one...
The Environmental Working Group created the Dirty Dozen app for the iPhone and it is fabulous. It's a wonderful tool to use when you can't get to a farmer's market, don't have a garden, or when you are trying to save cash deciding which organic produce to buy. I try to buy only organic and/or local produce but sometimes cash is tight and I feel like I need to make a judgement call. This app helps me to make the healthiest decisions possible and save money in the process. Good stuff!