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Palatability and preabsorptive insulin release.

J Louis-Sylvestre, J Le Magnen

    Neuroscience and Biobehavioral Reviews
    |January 1, 1980
    PubMed
    Summary
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    Food palatability influences insulin release before absorption. More palatable food increased insulin levels, suggesting a link between taste, preabsorptive insulin, and how much an animal eats.

    Area of Science:

    • Physiology
    • Endocrinology
    • Animal Behavior

    Background:

    • Preabsorptive insulin release, triggered by oral stimuli and mediated by the vagus nerve, plays a role in nutrient anticipation.
    • The relationship between food palatability and the magnitude of this early insulin response is not fully understood.

    Purpose of the Study:

    • To investigate if the level of orally-triggered, vagally-mediated preabsorptive insulin release correlates with food palatability.
    • To determine if food palatability, assessed by satiation levels, affects preabsorptive insulin secretion.

    Main Methods:

    • Rats were trained to eat five meals daily.
    • During test meals, rats consumed diets unaltered, sweetened, or sweetened with quinine.
    • Blood samples were collected before and after meals to measure immunoreactive insulin levels.

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    Main Results:

    • Rats consumed significantly different amounts of each diet (3g, 4.9g, 1.5g).
    • Peak insulin release varied, with the sweetened diet eliciting the highest response (65 microU/ml) and the quinine-adulterated diet the lowest (25 microU/ml).
    • The early insulin response occurred before significant food intake, suggesting a preabsorptive effect.

    Conclusions:

    • Food palatability significantly modulates preabsorptive insulin release in rats.
    • This palatability-dependent insulin release may influence the amount of food consumed.
    • Findings suggest a link between sensory aspects of food, early endocrine responses, and appetite regulation.