Basically... its eating anything without a bar code. Stay on the perimeter of the grocery store and you should be ok. Fruits, vegetables, nuts, meats, salads...food that hasn't been processed.
Sounds interesting, and kind of tough on the surface...but with some planning and menu making, all will be well. Here are a few tips if your going to give this a try.
FROM YAHOO VOICES:
1. Eat local/ Organic if you can. This helps keep down the exposure to pesticieds and supports local economy.
2. Go for color! Red Peppers, Avocado, sweet potatoes...the more color the better the nutrients.
3. Shop the perimeter of the grocery store. Its the processed stuff that is along the aisles.
4. Set aside time each sunday to plan, chop, pre-package and shop. This will go along way to keep you on track.