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Background and Objective: Aloe Vera is considered as one of herbs causes oxidative indexes modification due to antioxidant properties. On the other hands, High-fat diets (HFD) cause liver disorders prevalence. This study was done to evaluate the protective effect of hydro-alcoholic extract of Aloe Vera gel on enzymes and liver tissue structure of high-fat diet rats.
Methods: In this experimental study, 40 adult male rats were allocated in five groups including control, sham (HFD 10 ml/kg) and three experimental groups receiving HFD with doses of 150, 300 and 600 mg/kg/bw of Aloe Vera gel extract. Prescriptions were conducted by gavage and for 60 days. Blood samples were collected to measure AST, ALT and ALP enzymes. Liver removed subsequently and following preparing tissue sections liver cells were counted.
Results: High-fat diet significantly increased ALP and ALT enzymes (P<0.05). High-fat diet significantly increased the number of Kupffer cells and reduced of hepatocytes in compared to control group (P<0.05). High-fat diet caused liver tissue alterations including blood congestion, inflmation; Vacuole breakdown, apoptosis, and ballooning of hepatocytes. On the other hand, the consumption of Aloe Vera with high-fat diet caused reduction in tissue changes and a significant decrease in the serum levels of ALP and ALT enzymes in compared to control group (P<0.05).
Conclusion: High-fat diet by damaging the liver tissue  increased  the serum levels of ALP and ALT enzymes and Aloe Vera extract with its anti-oxidant characteristic prevent the effect of a high-fat diet on the liver tissue and reduced the ALP and ALT enzymes.

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Background and Objective: Atorvastatin is a member of the statin family with lipophilic character and anti-hyperlipidemic effect. There is many evidence that atorvastatin has protective effect on cognitive function. This study was done to evaluate the effect of atorvastatin on spatial memory in rats following a high-fat diet.
Methods: This experimental study was performed on 35 male Wistar male rats. Animals were randomly allocated into 5 groups including control, control plus atorvastatin and sham (received high-fat diet for 4 weeks) and high-fat diet plus atorvastatin (10 and 50 mg/kg, for 4 weeks). Learning and spatial memory were measured using Morris water maze for a 6-day period including 5 days training and the last day, test day (probe day).
Results: High-fat diet reduced learning and poor memory performance during training and probe compared to the control group, and also on the probe day, the high-fat group spent less time in the target quarter (P<0.05). Administration of atorvastatin after a high-fat diet improvement spatial memory in compared to high-fat group (P<0.05).
Conclusion: Short-term treatment (4 weeks) with atorvastatin in high-fat dietary rats can improve spatial memory.