Maybe it’s me, but I am not sure I follow this guy’s reasoning. Did the participants all have the same level of volunteerism before the study? Is this also true of people who, let’s say, viewed pictures of religious icons? Did they feel more or less altruistic afterwards? Are the findings correlation or cause?
“After viewing a few organic foods, comfort foods or control foods, participants who were exposed to organic foods volunteered significantly less time to help a needy stranger, and they judged moral transgressions significantly harsher than those who viewed non-organic foods. These results suggest that exposure to organic foods may lead people to affirm their moral identities, which reduces their desire to be altruistic.”
Psychology professor's research relates food to moral identities | WWNO.




