The study was based on three observations. In the first observation, participants who choose an apple instead of chocolate asked for a violent movie rather than a love story. In the second observation, self controlled participants showed more interest in aggressive people rather than fearful ones. Kalis Keto In the third observation, participants were more favorable of public policy messages with a firm. The study quoted Dr. David Gal as saying that "we found that people who have self controlled on diet have to exert for their daily choices can put them under a lot of stress and anger."