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LOS ANGELES (AP) - Food labels tell consumers about the calories, nutrients and serving size of a product.

Will they want to know if their food is genetically engineered? That question is at the heart of a California ballot initiative that seeks to require certain foods that contain genetically modified ingredients to be labeled as such.

Proponents say people have a right to know what they're eating. Opponents say grocery bills will be higher if the measure is passed next month.

Genetically engineered crops have existed for more than a decade. Most of the biotech crops are used for animal feed or as ingredients in processed foods including cookies, cereal, potato chips and salad dressing.

The federal government and many scientists have said such foods are safe to eat.