Kalila Volkov, in her Sept. 28 Viewpoint, stated that no long-term studies have been conducted to determine the health effects of eating genetically engineered foods. However, the first peer-reviewed study was done recently and published in the journal Food and Chemical Toxicology. For two years, researchers fed rats a diet of genetically engineered corn that is common in the U.S. food supply, and found massive mammary tumors, kidney and liver damage, and premature death. Because of this study, Russia is now not allowing genetically engineered foods in their country, and Europe may not soon. I plan to vote yes on Proposition 37, so I can better avoid genetically engineered foods.