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Gender differences between the effect of monosodium glutamate on food intake in rats

R Racotta1, A Hernandez-Garcia

  • 1Departmento de Fisiologia, Escuela Nacional de Ciencias Biológicas, IPN, México, D.F.

Physiology & Behavior
|August 1, 1989
PubMed

Insights

Monosodium glutamate (MSG) affects rat feeding differently based on gender. Female rats showed reduced food intake at high doses, while male rats exhibited increased food and water consumption.

Area of Science:

  • Neuroscience
  • Physiology
  • Endocrinology

Background:

  • Monosodium glutamate (MSG) consumption is widespread.
  • Previous research indicated MSG increases feeding in rats.
  • The impact of MSG on feeding behavior requires further investigation, particularly concerning sex-based differences.

Purpose of the Study:

  • To compare the effects of MSG administration on food and water intake in male and female adult rats.
  • To investigate potential sex-specific responses to subcutaneous MSG.

Main Methods:

  • Adult male and female rats were administered subcutaneous injections of MSG (3 g/kg or 6 g/kg) or saline (NaCl 0.9%).
  • Food and water intake were monitored and compared between treatment groups and sexes.

Main Results:

  • In female rats, MSG at 3 g/kg had no significant effect, while 6 g/kg reduced food intake and increased water intake.
  • In male rats, MSG at 6 g/kg significantly increased both food and water intake.
  • Significant differences in response to MSG were observed between male and female rats.

Conclusions:

  • Sex significantly influences the effect of glutamate on food intake regulation in rats.
  • MSG's impact on appetite and hydration is sexually dimorphic.
  • These findings highlight the importance of considering sex in neurobiological studies of appetite control.

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