When one understands higher knowledge, he or she naturally becomes a vegetarian. They appreciate the lives of other sentient living beings, and stop consuming them. Not only is this a wise move morally, karmically, economically and ecologically, but it is also way healthier for the body.
“Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet.” Albert Einstein
Fruits and vegetables are living and growing beings, but they are much less sentient than animals, and so the karma (mental and physical reactions) for eating them is much less. To completely nullify the effect of karma, one can spiritualize their vegetarian food by offering it to God. In the Vedas such pure, soul-nourishing food is taken beyond vegetarianism and is known as prasadam, which literally means “God’s mercy”. When you prepare prasadam, even cooking becomes an act of meditation and loving devotion.