https://phys.org/news/2019-01-critic-turned-believer-sway-case-genetically-foods.html > Now, a new study from researchers at the Annenberg Public Policy Center shows that such a conversion message can influence public attitudes toward genetically modified (GM) foods. > Using video of a talk by the British environmentalist Mark Lynas about his transformation from an opponent of GM crops to an advocate, researchers found that Lynas' conversion narrative had a greater impact on the attitudes of people who viewed it than a direct advocacy message.