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Obesity appears to be a dominant condition above inflammation to produce IR in RA patients. The dissociation of the inflammation and obesity components to produce IR suggests the need of an independent therapeutic strategy in obese patients with RA.

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The present study evaluates the effect of aspartame intake in rats under a diet mimicking the trends of fat consumption in the society. The composition of the experimental diet was within the recommended human limits except the saturated fat amount supplying from coconut fat. Rats under the experimental diet showed an increase in the body weight, transitory increase in the blood pressure and in plasma values of glucose and triglycerides alongside a transitory reduction in plasma urea versus the standard group. Rats under the experimental diet plus aspartame intake (54.8 ± 7.3 mg/kg bw/day) did not show any increase of body weight and in plasma values of glucose and triglycerides while showed an improvement in the plasma value of urea with respect the group under only the experimental diet. However, the aspartame group showed a more maintained increase of blood pressure. In conclusion, experimental diet produces negative effects on cardiovascular risk factors of the rats while the aspartame intake under the experimental feeding had mixed effects on the cardiometabolic factors of the animals.