Tuesday, March 22, 2011
Going on a Diet Can Make You Irritable
It may usually be part of an effort to live a better, happier life. But dieting actually makes people more likely to be irritable and angry, according to research.
The effort involved in resisting cravings and being disciplined about eating can provoke aggressive behaviour.
Scientists compared the attitudes of volunteers who were on a diet with those who ate what they wanted. They found that those counting the calories were quicker to express irritation when they were subjected to a hectoring public service advertisement which promoted exercise.
The American researchers behind the study wrote: 'We set out to examine whether exerting self-control can indeed lead to a wide range of angry behaviors and preferences subsequently, even in situations where such behaviors are quite subtle.'
'Research has shown that exerting self-control makes people more likely to behave aggressively toward others and people on diets are known to be irritable and quick to anger.'
David Gal of Northwestern University and Wendy Liu of the University of California found that people who exerted self-control were more likely to prefer anger-themed movies, were more interested in looking at angry facial expressions, were more persuaded by angry arguments, and expressed more irritation at a message that used controlling language to convince them to change their exercise habits.
In one experiment for the study published in the Journal of Consumer Research, people who choose an apple instead of a chocolate bar were more likely to choose movies with anger and revenge themes than milder movies.
In another study, participants who exerted financial restraint by choosing a gift certificate for groceries over one for a spa service showed more interest in looking at angry faces rather than at fearful ones.
In a third experiment, dieters had more favorable opinions toward a public policy message that used an anger-framed appeal (if funds are not increased for police training, more criminals will escape prison) than they did toward a sad message.
Finally, participants who chose a healthy snack over a tastier, less-healthy one were more irritated by a marketer's message that included controlling language (words such as "you ought to," "need to," and "must").
'Public policy makers need to be more aware of the potential negative emotions resulting from encouraging the public to exert more self control in daily choices," the authors write. 'Instead behavioral interventions might rely on a broader range of methods to foster positive behaviors toward long-term goals."