homeostasis/metabolism
• when fed a high-fat diet for 20 weeks, males gain significantly less weight than wild-type controls at most time points examined, despite an increase in food consumption
• however, no differences in weight gain are observed on a normal chow diet
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• on a high-fat diet, CO2 production is significantly higher than that in wild-type controls
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• on a high-fat diet, O2 consumption is significantly higher than that in wild-type controls
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• in a food tolerance test (where mice are fasted overnight and refed with normal chow), postprandial glucose clearance is significantly increased, as blood glucose levels after feeding are significantly lower than those in wild-type controls
• however, glucose tolerance is not altered under a high-fat diet
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• on a high-fat diet, glycogen concentration in epididymal fat pad (WAT) is reduced by 30% relative to that in wild-type controls
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• on a high-fat diet, liver glycogen level is significantly lower than that in wild-type controls (10.9 mg/g versus 19.1 mg/g, respectively)
• however, liver weight is normal under a high-fat diet
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• in an insulin tolerance test (ITT), males fed a high-fat diet show significantly lower blood glucose levels than wild-type controls before and after insulin administration
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• on a high-fat diet, the metabolic rate of males is significantly higher than that in wild-type controls, as measured by O2 consumption and CO2 production
• however, respiratory exchange ratio (RER) is normal indicating that the energy source consumed is not altered
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growth/size/body
• on a high-fat diet, the % of fat mass is significantly lower than that in wild-type controls (16.7% versus 27.1%, respectively)
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• on a high-fat diet, the % of lean mass is significantly higher than that in wild-type controls
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• when fed a high-fat diet for 20 weeks, males gain significantly less weight than wild-type controls at most time points examined, despite an increase in food consumption
• however, no differences in weight gain are observed on a normal chow diet
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behavior/neurological
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• on a high-fat diet, males show normal physical (voluntary) activity through a 12-hr light/dark cycle
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• on a high-fat diet, daily food intake per g of body weight is significantly higher than that in wild-type controls
• however, no differences in food intake are observed on a normal chow diet
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liver/biliary system
• on a high-fat diet, liver glycogen level is significantly lower than that in wild-type controls (10.9 mg/g versus 19.1 mg/g, respectively)
• however, liver weight is normal under a high-fat diet
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• on a high-fat diet, liver triglyceride level is only slightly lower while lipid accumulation in the liver is markedly decreased relative to that in wild-type controls as shown by Oil Red O staining
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adipose tissue
• on a high-fat diet, glycogen concentration in epididymal fat pad (WAT) is reduced by 30% relative to that in wild-type controls
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• on a high-fat diet, the % of fat mass is significantly lower than that in wild-type controls (16.7% versus 27.1%, respectively)
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• on a high-fat diet, the epididymal WAT to body weight ratio is significantly lower than that in wild-type controls (3.31% versus 4.71%, respectively)
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