What is the theme in My Year of Meats by Ruth L. Ozeki?

A huge theme of this novel deals with the use of antibiotics and hormones in meat that will be consumed. Jane knows very little about the meat industry in America when she first takes a job as the producer of a reality show to promote the consumption of beef in Japan. However, as she begins to work on the show, Jane sees firsthand the effects of using these drugs in meat.