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Related Experiment Video

Updated: Mar 1, 2026

Measuring Oral Fatty Acid Thresholds, Fat Perception, Fatty Food Liking, and Papillae Density in Humans
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A pilot study into a possible relationship between diet and stuttering.

Jean Hum1, Toni Rietveld2, Piet Wiedijk1

  • 1Oral Dynamics Lab (ODL), Department of Speech-Language Pathology, University of Toronto, Canada.

Journal of Fluency Disorders
|June 4, 2017
PubMed
Summary

This study found no link between copper or thiamine supplements and stuttering frequency. However, mood state showed a significant correlation with fluency in adults who stutter.

Keywords:
AnxietyCopperDietStutteringThiamine

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Area of Science:

  • Neuroscience
  • Nutritional Science
  • Speech-Language Pathology

Background:

  • Theoretical and empirical evidence suggests copper metabolism may influence stuttering.
  • Dietary intake's role in stuttering has not been systematically investigated.
  • Copper and thiamine (vitamin B1) are essential nutrients with potential neurological roles.

Purpose of the Study:

  • To explore the association between ingested copper and thiamine levels and stuttering frequency.
  • To investigate the impact of copper and thiamine supplementation on stuttering in adults.
  • To utilize a double-blind, cross-over, longitudinal study design.

Main Methods:

  • 19 adults (20-51 years) who stutter participated over 9 weeks.
  • Online surveys included self-assessed fluency, mood, and food journals.
  • A double-blind, cross-over design involved copper and thiamine supplementation with washout periods.
  • Formal speech assessments were conducted at baseline and post-supplementation.

Main Results:

  • Copper and thiamine supplementation did not significantly affect stuttering frequency based on self and formal assessments.
  • A moderate, significant correlation was observed between mood state and fluency.
  • No measurable effect of dietary copper or thiamine on stuttering was detected.

Conclusions:

  • Findings do not support the hypothesis that dietary copper or thiamine influences stuttering.
  • A relationship between variations in stuttering and self-perceived anxiety is modestly supported.
  • Further research on the interplay between mood and stuttering is warranted.