The biotech industry and others have contributed millions of dollars to stop this proposition. We already have labeling of foods: Calories, fats, the breakdown of nutrients and ingredients, country of origin, etc. I don't think genetically modified foods are healthy. The FDA has not conducted a single independent test of any genetically engineered product. The agency simply accepts the testing completed and provided by the biotechnology companies. Conflict of interest? Only one human study has been done with GMOs and of the seven people involved, three has adverse effects after eating the genetically modified food.
Proposition 37, if passed, would require food sold in grocery stores to be labeled that it is produced with genetic engineering. It would also be prohibited from being advertised as "natural." This does not apply to restaurants. There is no added cost to consumers. It is a grassroots effort, started in Chico, by people who want to eat good, healthy food.