SANTIAGO, Chile — "Bon appetit," said Chilean artist Marco Evaristti as he presented his friends with his newest creation: meatballs cooked with fat from his own body, extracted by liposuction. "Ladies and gentleman, bon appetit and may god bless," said Evaristti, a glass in his hand, to his dining companions seated last Thursday night around a table in Santiago's Animal Gallery. On the plates in front of them was a serving of agnolotti pasta and in the middle a meatball made with oil Evaristti removed from his body in a liposuction procedure last year. "The question of whether or not...