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Acute changes in the response to peripheral leptin with alteration in the diet composition
L Lin1, R Martin, A O Schaffhauser
1Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA 70808, USA. linl@pbrc.edu
Summary
Dietary fat, not obesity, quickly causes leptin resistance. Rats on high-fat diets showed reduced response to leptin, impacting feeding behavior and hormone levels.
Area of Science:
- Nutrition Science
- Endocrinology
- Neuroscience
Background:
- Diet-induced obesity in rodents is linked to leptin resistance.
- Leptin is a key hormone regulating appetite and body weight.
Purpose of the Study:
- To investigate if dietary fat itself, independent of obesity, alters the feeding response to peripheral leptin.
- To determine the time course of leptin resistance development in response to high-fat diets.
Main Methods:
- Osborne-Mendel rats were adapted to either high- or low-fat diets.
- Rats received peripheral leptin injections and their feeding responses were monitored with familiar or alternative diets.
- Serum corticosterone levels and hypothalamic neuropeptide Y mRNA expression were analyzed.
Main Results:
- Rats adapted to a high-fat diet showed no feeding response to leptin.
- Switching high-fat diet-adapted rats to a low-fat diet restored leptin sensitivity.
- Switching low-fat diet-adapted rats to a high-fat diet induced leptin resistance within 5 days.
- Leptin affected corticosterone and neuropeptide Y in low-fat fed rats but not high-fat fed rats.
Conclusions:
- Dietary fat exposure, rather than obesity, can rapidly induce leptin resistance.
- Short-term consumption of high-fat diets significantly impairs the body's response to leptin.
- These findings suggest a direct role for dietary fat composition in metabolic dysregulation.