In a recent study looking at the antioxidant effects of grape juice on oxidative stress in the brain, researchers from several universities in Brazil examined the antioxidant effect differences of organic versus conventional grape juice on rats consuming a high-fat diet. Researchers used three groups of rats for their study:  a control group fed water, a conventional test group fed conventional grape juice, and an organic test group fed organic grape juice. The study findings showed that while both organic and conventional grape juice showed antioxidant effects, organic grape juice was more successful at protecting against oxidative stress in the brain. The study concludes that grape juices could be useful in treating some neurodegenerative diseases associated with oxidative damage, and that organic grape juice is more effective than conventional grape juice in this protection.