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Related Experiment Videos

Changes in macronutrient selection as a function of dietary tryptophan.

P J White1, K A Cybulski, R Primus

  • 1Rutgers, State University of New Jersey, New Brunswick 08903.

Physiology & Behavior
|January 1, 1988
PubMed
Summary

The serotonergic system influences nutrient selection, with tryptophan loading reducing carbohydrate intake in rats. However, rats compensated by increasing fat intake, maintaining overall caloric intake.

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Area of Science:

  • Neuroscience
  • Nutritional Science
  • Behavioral Biology

Background:

  • The serotonergic system is implicated in regulating food intake, particularly carbohydrate and protein consumption.
  • Previous studies suggested tryptophan supplementation affects nutrient selection based on diet composition.

Purpose of the Study:

  • To investigate the role of the serotonergic system in nutrient selection when rats have independent access to protein, carbohydrate, and fat sources.
  • To determine if increased serotonergic activity alters the intake of specific macronutrients and total caloric intake.

Main Methods:

  • Rats were provided with separate sources of protein, carbohydrate, and fat following tryptophan loading.
  • Intake of each macronutrient and total caloric intake were measured.

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  • Hypothalamic concentrations of serotonin and 5-hydroxyindole acetic acid were analyzed to assess serotonergic system activity.

    • Main Results:

    • Tryptophan loading led to a significant decrease in carbohydrate intake.
    • Rats increased their intake of fat and, to a lesser extent, protein.
    • Total caloric intake remained constant, indicating compensatory feeding behavior.
    • Increased hypothalamic serotonin and 5-hydroxyindole acetic acid levels confirmed enhanced serotonergic activity.

    Conclusions:

    • Serotonin plays a role in carbohydrate intake regulation, with reduced consumption observed after tryptophan loading.
    • The serotonergic system's influence extends to other macronutrients, as evidenced by increased fat and protein intake.
    • Rats can maintain caloric homeostasis by adjusting fat and protein consumption when carbohydrate intake is reduced.