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PREDICTING THE EFFECTS OF A HIGH ENERGY DIET ON FATTY LIVER AND HIPPOCAMPAL-DEPENDENT MEMORY IN MALE RATS
OBJECTIVE: In rodents, diets exceeding nutritional requirements (i.e. high-energy diets; HED) impair hippocampal-dependent memory. Our research suggests that the effects likely involve HED-induced increases in liver lipids. In this experiment, we provided rats with diet choices and tested whether vo...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3695417/ https://www.ncbi.nlm.nih.gov/pubmed/23784893 http://dx.doi.org/10.1002/oby.20167 |
Sumario: | OBJECTIVE: In rodents, diets exceeding nutritional requirements (i.e. high-energy diets; HED) impair hippocampal-dependent memory. Our research suggests that the effects likely involve HED-induced increases in liver lipids. In this experiment, we provided rats with diet choices and tested whether voluntary consumption of a HED impairs spatial memory, whether differences in initial weight gain predict memory deficits, and whether increases in liver lipids are associated with the memory deficits. DESIGN & METHODS: Adult male Sprague-Dawley rats were given a control diet or cafeteria-style HED for 8 weeks. Weight gain during the first 5 days on the diet was used to divide rats into a HED-Lean group and HED-Obese group. Spatial water maze memory was tested 8 weeks later and postmortem liver lipid concentrations were quantified. RESULTS: Compared with the HED-Lean and control rats, the HED-Obese rats had impaired spatial memory and met the human diagnostic criterion of non-alcoholic fatty liver disease (> 5% liver lipids relative to liver weight). Moreover, liver lipids were correlated with memory deficits. CONCLUSIONS: These findings show that voluntary consumption of a HED impairs memory, that initial weight gain predicts fatty liver and memory deficits, and that fatty liver may contribute to the memory-impairing effects of obesity. |
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