If it has a nervous system, I don't eat it. Nervous system = pain.

A vegetarian once told me she doesn't eat anything that poops. Funny, but also true.

Consciousness is the energy or the symptom of the soul. Even plants have consciousness, to a lesser degree, but plant life can be made into Prasadam and thus can become karma free.

I personally believe that the plants and rocks have consciousness too - albeit quite different from our own. While I choose a plant-based diet, I believe it is important to remember that life feeds on death. In order for us to feed, we are often taking the life of something, even if it is a plant. Respect and acknowledgment of that sacrifice is important to me. I know a few yogins who will only eat parts of the plant that are voluntarily dropped by the plant - the fruits and seed pods. Things like squashes and avocado and peppers and of course sweet fruits, and such. Another place to take the awareness and respect for the life forms that nourish our bodies and give the gift of life to us!