Abstract
Weight gain is a common problem in domestic cats, but little is known about its metabolic effects. The purpose of this study was to determine the effects of diet-induced weight gain and subsequent weight loss on metabolic rate, body composition, and glucose tolerance. Gain of approximately 20 per cent body weight (divided approximately equally between fat and fat-free mass) over three months resulted in insulin resistance in females, indicated by increases in basal insulin concentration (68.2+/-7.9 to 119+/-16.5 pmol litre(-1), P<0.05), insulin peak response to glucose (241.1+/-31.6 to 315.0+/-23.0 pmol litre(-1), P<0.05), and deltaI/deltaG (14.2+/-2.6 to 18.1+/-1.3 pmol mmol(-1), P<0.05) compared with pre-gain values. The same numerical trend was noted in male cats, however, changes were not significant (P>0.05). Alterations in serum lipids included significant (P<0.05) elevations in triglyceride concentrations in male cats and decreased beta-lipoprotein concentrations in both genders. Weight loss over three months normalised basal insulin, insulin response to glucose, and serum triglyceride concentrations, and resulted in significant (P<0.05) decreases in serum concentrations of beta- and prebeta-lipoproteins, cholesterol, an...Continue Reading
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