Don't eat anything that your great-great-grandmother wouldn't recognize as food.
It's an excellent recommendation aimed at guiding us away from processed foods and back toward things that are nutritious and healthy. As I wander through my un-diet, it's one of my general rules of thumb-- not an absolute, but something that's basically a good idea.
I think it needs a slight modification for an urban, multicultural society-- my great-great-grandmother certainly wouldn't recognize chicken tikka, tom kha gai, truffles, or any number of wonderful tasty things as food. Since I'd rather not be guided by the limited variety from 100 years go, I'm extending the rule a bit, while keeping the general principle-- if it's good enough for gramma Nguyen, it's good enough for me.
How was my shopping trip tonight?
- orange juice
I don't know about cereal, and store-bought bread is a hair questionable, but in general I'd say I hit the principles pretty well.
I also made one modification to the roasted tomato soup recipe I posted recently: garnish with fresh basil that you just picked off of your AeroGarden. I love being able to just walk over and pick fresh herbs, and in a few weeks I should have salad greens too.