What Enables Self-Control? A Test of Glucose, Fructose, and Vagus Nerve Activation as Possible Factors

Authors

  • Elizabeth D. Clo Department of Psychology, Bishop’s University Canada
  • Lionel G. Standing Department of Psychology, Bishop’s University Canada
  • Stuart J. McKelvie Department of Psychology, Bishop’s University Canada

DOI:

https://doi.org/10.24310/espsiescpsi.v8i1.13225

Keywords:

Fructose, Glucose, Self-control, Vagus Nerve

Abstract

This study replicated the study by Miller, Bourrasseau, and Blampain (2013) on the effects of fructose and glucose on self-control. It also investigated these authors' suggestion that self-control may be under the influence of the vagus nerve, which can be activated by forceful exhalation in the Valsalva manoeuvre. The participants (N = 101) were assigned to one of five conditions: three groups that received a solution of either glucose, fructose, or a placebo sweetener (solution condition); and two groups that underwent the Valsalva manoeuvre (VM and VM-control). Participants in the solution condition groups ingested one of the three sweeteners, whereas those in the VM and VM-control conditions were required to blow or not blow into a manometer for 15 seconds, respectively. The number of anagrams that participants subsequently completed was used to assess their level of self-control. In contrast to the results obtained by Miller et al. (2013), it was found that fructose, glucose, and VM did not increase the participants' levels of self-control compared to control subjects. These negative results concur with several recent studies which document the difficulty of replicating published findings in psychology.

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Published

2015-05-01

How to Cite

Clo, E. D., Standing, L. G., & McKelvie, S. J. (2015). What Enables Self-Control? A Test of Glucose, Fructose, and Vagus Nerve Activation as Possible Factors. Escritos De Psicología - Psychological Writings, 8(1), 38–43. https://doi.org/10.24310/espsiescpsi.v8i1.13225

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Section

Research Reports