Social exclusion impairs self-regulation.

@article{Baumeister2005SocialEI,
  title={Social exclusion impairs self-regulation.},
  author={Roy F. Baumeister and C. Nathan DeWall and Natalie J. Ciarocco and Jean M. Twenge},
  journal={Journal of personality and social psychology},
  year={2005},
  volume={88 4},
  pages={
          589-604
        }
}
Six experiments showed that being excluded or rejected caused decrements in self-regulation. In Experiment 1, participants who were led to anticipate a lonely future life were less able to make themselves consume a healthy but bad-tasting beverage. In Experiment 2, some participants were told that no one else in their group wanted to work with them, and these participants later ate more cookies than other participants. In Experiment 3, excluded participants quit sooner on a frustrating task. In… 

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