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Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing

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Published on: October 25, 2019

Leptin resistance does not induce hyperphagia in the rat.

Takashi Higuchi¹, Akiko Mizuno, Kazumi Narita

¹Department of Integrative Physiology, University of Fukui, Matsuoka, Eiheiji-cho, Fukui, Japan. higuchit@u-fukui.ac.jp

The Journal of Physiological Sciences : JPS

|December 7, 2011

Summary

Leptin resistance does not cause overeating in rats fed a high-fat diet (HFD). Despite reduced food intake over time, HFD-fed rats gained more weight, suggesting body weight is not constantly regulated.

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Area of Science:

Metabolism and Endocrinology
Animal Physiology

Background:

Leptin is recognized for its role in regulating body weight by suppressing appetite.
Leptin resistance is implicated in high-fat diet (HFD)-induced obesity, potentially impairing its function.
The precise impact of leptin resistance on feeding behavior and weight gain warrants further investigation.

Purpose of the Study:

To investigate the effects of switching from ordinary chow (OC) to a HFD on feeding patterns and weight gain in male rats.
To determine if leptin resistance influences hyperphagia or leads to altered body weight regulation.

Main Methods:

Male rats were fed either OC or a HFD.
Food intake (by weight and calories) and body weight gain were monitored over 20 days.
Feeding patterns, including nocturnal intake, were analyzed in relation to developed leptin resistance.

Main Results:

Initial HFD intake increased, but caloric consumption gradually decreased to match OC levels by day 20.
Reduced food intake occurred exclusively during nighttime hours, without a change in HFD preference.
Despite normalized caloric intake, HFD-fed rats exhibited significantly greater weight gain compared to controls.

Conclusions:

Leptin resistance does not appear to induce hyperphagia (overeating) in the context of HFD feeding.
The findings suggest that body weight may not be regulated to maintain a constant level, challenging established physiological models.