Metformin and Rosiglitazone, Alone or in Combination, in HIV-Infected Patients With Insulin and Fat Abnormalities

The purpose of this study is to see whether metformin alone, rosiglitazone alone, or metformin and rosiglitazone together will lower insulin levels in the blood and decrease fat in the abdomen or other parts of the body. Studies have shown that certain anti-HIV medications can cause a number of side effects, including high blood sugar (resulting from the body\'s failure to use insulin), high insulin, and excess fat build-up in the abdominal area. These side effects are known to increase the risk of heart disease. Metformin and rosiglitazone are 2 drugs that have been shown to lower insulin resistance and lessen abdominal fat in patients who are not HIV-infected. This study will investigate the use of these drugs in HIV-infected patients.