Many practitioners of Buddhism follow a strict vegetarian diet. They do this in an attempt to follow the way of Buddha, who is believed to have lived a vegetarian life that shunned killing. It seems, however, that this may not be the whole truth.
According to research, Buddha accepted all foods given to him as long as he wasn’t the sole reason for the killing and the killing wasn’t done in front of him. This probably helps explain why many depictions of him are of a relatively fat guy, who could never have gained so much weight on eating vegetables alone.