Dr. Weil says (on p. 109):

The point of bringing a spiritual perspective into your life is to remind yourself that you are more than just your physical body, that there is more to life than the material universe.

He thinks that a good time to remind ourselves of this is when we sit down to eat, keeping in mind that whether you are a strict vegetarian or an omnivore, that you are taking life each time you eat, to sustain your life. He says “Life lives at the expense of other life,” which is something I had never given much thought to before. I mean, I think about it, being a huge meat lover myself, but never think about it in terms of eating my veggies, but it is true. So take a moment before you eat, and say a prayer if you are a religous person, or at the very least, reflect on being thankful that you have food to eat, or just close your eyes for a moment and concentrate on your breathing.