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Diet-induced mood changes in normal populations.

P D Leathwood, P Pollet

    Journal of Psychiatric Research
    |January 1, 1982
    PubMed
    Summary
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    Caffeine significantly boosts alertness and cognitive function, while tryptophan induces drowsiness. Neither substance impacts hunger or food preferences, according to this study on mood and stimulant effects.

    Area of Science:

    • Neuroscience
    • Nutritional Science
    • Psychology

    Background:

    • Caffeine, tryptophan, and tyrosine are common substances affecting neurotransmitter systems.
    • Understanding their impact on mood, cognition, and appetite is crucial for nutritional and psychological research.

    Purpose of the Study:

    • To investigate the effects of caffeine, tryptophan, and tyrosine on mood, hunger, and food preferences.
    • To compare the subjective sedation/stimulation levels induced by these substances.

    Main Methods:

    • A double-blind, placebo-controlled study involving 60 volunteers.
    • Participants completed an 11-item questionnaire assessing mood and food-related parameters.
    • Treatments included caffeine (100 mg), tryptophan (500 mg), tyrosine (500 mg), and placebo.

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    Main Results:

    • Caffeine significantly enhanced scores for wakefulness, vigor, mental clarity, energy, and efficiency.
    • Caffeine was ranked as the most stimulating treatment.
    • Tryptophan administration led to increased scores for somnolence and lethargy, and was ranked as the most sedating.
    • Tyrosine showed no significant effects.
    • No treatment altered hunger ratings or food preferences (carbohydrate/protein).

    Conclusions:

    • Caffeine acts as a potent stimulant, enhancing cognitive and mood-related parameters.
    • Tryptophan exhibits sedative properties, contrasting with caffeine's stimulant effects.
    • These amino acids and caffeine do not appear to influence appetite or macronutrient choices.