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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...

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Detalles Bibliográficos
Autores principales: Darling, J. N., Ross, A. P., Bartness, T. J., Parent, M. B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2013
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
Descripción
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.