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Caffeine can decrease subjective energy depending on the vehicle with which it is consumed and when it is measured.

H A Young1, D Benton

  • 1Department of Psychology, University of Swansea, Wales, UK.

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Summary
This summary is machine-generated.

Caffeine in energy drinks impacts blood glucose and mood. While it improves cognitive function, its effects on mood vary depending on the drink

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Area of Science:

  • Nutritional Neuroscience
  • Human Metabolism
  • Cognitive Psychology

Background:

  • Energy drinks contain glucose and caffeine, potentially affecting blood glucose homeostasis, cognition, and mood long-term.
  • The combined impact of glucose and caffeine on physiological and cognitive outcomes requires further investigation.

Purpose of the Study:

  • To investigate the effects of caffeine and varying glycaemic loads on interstitial glucose levels, mood, and cognition.
  • To differentiate the impact of caffeine when consumed with different beverage bases (yoghurt, glucose, water).

Main Methods:

  • Participants consumed a standard breakfast followed by a yoghurt-, glucose-, or water-based drink, with or without 80 mg of caffeine.
  • Interstitial glucose levels, mood, and cognitive performance were assessed at various time points post-consumption.

Main Results:

  • Caffeine consumption elevated blood glucose levels, irrespective of the beverage base.
  • Caffeine with water initially increased subjective energy but later led to negative mood states (tiredness, hostility, confusion).
  • Caffeine with a yoghurt-based drink improved mood (energy, agreeableness, clearheadedness) and cognitive functions (memory, reaction time, vigilance) across all conditions.

Conclusions:

  • Caffeine's influence on mood is modulated by its vehicle, with macronutrients like those in yoghurt potentially mitigating negative effects.
  • Further research is needed to understand the interaction between caffeine, macronutrients, and the temporal dynamics of their effects on cognition and mood.