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Meal pattern analysis: artifacts, assumptions and implications.

T W Castonguay, L L Kaiser, J S Stern

    Brain Research Bulletin
    |September 1, 1986
    PubMed
    Summary
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    Meal patterns in rats show weak correlations between meal size and duration or intervals. Optimal analysis requires specific end-of-meal definitions for daytime and nighttime feeding behavior.

    Area of Science:

    • Animal Behavior
    • Nutritional Science
    • Physiology

    Background:

    • Understanding rodent feeding patterns is crucial for modeling homeostatic feeding behavior.
    • Previous studies have shown weak correlations between meal size and duration or intervals.

    Purpose of the Study:

    • To investigate the relationship between meal size, meal duration, and inter-meal intervals in Sprague-Dawley rats.
    • To determine appropriate end-of-meal criteria for analyzing feeding patterns.

    Main Methods:

    • Continuous monitoring of food intake in 12 male Sprague-Dawley rats over eight days.
    • Precise measurement of food intake (0.01g) and meal parameters.
    • Application of log survivorship analysis to interval data.

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    Main Results:

    • Weak correlations were observed between meal size and meal duration/intervals.
    • A significant interaction was found between end-of-meal definition and the correlation strength.
    • Log survivorship analysis suggested a 10-minute definition for daytime and a 5-minute definition for nighttime patterns.

    Conclusions:

    • The choice of end-of-meal criteria significantly impacts the observed correlations in feeding behavior.
    • Data-determined criteria (10 min daytime, 5 min nighttime) render the correlation between meal size and post-meal interval non-significant.
    • Findings provide insights into the homeostatic regulation of feeding behavior.