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Self-control (or self-regulation) is the ability to control or over- findings, the precise nature of the energy source of self-control has
ride one’s thoughts, emotions, urges, and behavior. Self-control remained unspecified. In the present, we examined whether self-
allows for the flexibility necessary for successful goal attainment, control does indeed rely on an actual energy source, namely, blood
and it greatly facilitates adherence to morals, laws, social norms, glucose.
and other rules and regulations. As such, it is one of the most Since Freud (1923/1961a, 1933/1961b), psychological theoriz-
important and beneficial processes in the human personality struc- ing about personality or the self has used energy models relatively
ture. A burgeoning body of evidence has linked good self-control sparingly. Yet, the human body is undeniably an energy system,
to a broad range of desirable outcomes, including healthier inter- and its very life depends on ingesting energy and then using it to
personal relationships, greater popularity, better mental health, fuel its activities, including complex psychological processes. The
more effective coping skills, reduced aggression, and superior human brain consumes 20% of the body’s calories even though it
academic performance, as well as less susceptibility to drug and constitutes only 2% of the body’s mass (Dunbar, 1998). In order
alcohol abuse, criminality, and eating disorders (DeWall, for evolution to have selected in favor of such expensive psycho-
Baumeister, Stillman, & Gailliot, in press; Duckworth & Selig- logical processes, those processes must have paid great adaptive
man, 2005; Finkel & Campbell, 2001; Gailliot, Schmeichel, & dividends to offset such a high cost in calories. The capacity for
Baumeister, 2006; Gottfredson & Hirschi, 1990; Kahan, Polivy, & self-control provides numerous benefits (e.g., Baumeister, 2005),
Herman, 2003; Pratt & Cullen, 2000; Shoda, Mischel, & Peake, and so it is plausible that self-control may have been one psycho-
1990; Tangney, Baumeister, & Boone, 2004; Vohs & Heatherton, logical process that was immensely valuable despite being so
2000). expensive in terms of caloric energy (glucose).
Self-control seems to rely on a limited energy or strength, such An accumulating amount of evidence is consistent with the
that engaging in a single act of self-control impairs subsequent notion that self-control relies on some kind of energy. For instance,
attempts at self-control, as if some sort of energy had been used up after resisting the temptation to eat freshly baked cookies, partic-
during the initial act (for reviews, see Baumeister, Gailliot, De- ipants in one study quit sooner on a subsequent task requiring
Wall, & Oaten, in press; Muraven & Baumeister, 2000). Although effortful persistence, compared with participants who did not have
viewing self-control as an energy resource has served as a highly to resist eating the cookies (Baumeister, Bratslavsky, Muraven, &
convenient metaphor that explains a broad range of empirical Tice, 1998). Resisting the temptation to eat the cookies presum-
ably depleted an energy resource that could otherwise have been
used to persist on the subsequent task. A variety of other behaviors
have been found to rely on and deplete this energy source as well,
Matthew T. Gailliot, Roy F. Baumeister, C. Nathan DeWall, Jon K. including managing one’s impression (Vohs, Baumeister, & Cia-
Maner, E. Ashby Plant, Dianne M. Tice, Lauren E. Brewer, Department of rocco, 2005), suppressing stereotypes and prejudice (Gordijn, Hin-
of Psychology, Texas A&M University. driks, Koomen, Dijksterhuis, & Van Knippenberg, 2004; Richeson
Correspondence concerning this article should be addressed to Matthew & Shelton, 2003; Richeson & Trawalter, 2005; Richeson,
Gailliot or Roy Baumeister, Department of Psychology, Florida State
University, Tallahassee, FL 32306-1270. E-mail: gailliot@psy.fsu.edu or
Trawalter, & Shelton, 2005), coping with thoughts and fears of
dying (Gailliot et al., 2006), controlling one’s monetary spending
baumeister@psy.fsu.edu
(Vohs & Faber, 2004), restraining aggression (DeWall et al., in
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