Regarding your question about why we do not eat meat and yet we eat plant life, the answer is that we do everything as Krishna recommends. Everything we eat is first offered to Lord Krishna, and because Krishna does not eat meat, therefore we also do not eat meat. The fruits, grains, and vegetables which we offer to the Lord are not caused any suffering by our offering them to Krishna. Rather they are greatly benefited because to be offered for the pleasure of the Lord will grant for the living entity within the plant body certain liberation in the near future. Everything that we do in Krishna Consciousness is ultimately beneficial to all living creatures because we are working under the recommendations of the Lord Himself who is the well-wisher of all His part and parcel children. I hope this will sufficiently clear up this matter for you.
Srila Prabhupada’s letter to: Ann Clifford — Los Angeles 2 August, 1969