 Subjects will report to Massachusetts General Hospital MGH or Massachusetts Institute of Technology MIT Clinical Research Center GCRC after an overnight fast. Fasting blood work will be obtained to test for CRP, adiponectin, IL-6, TNF-alpha, TNF-alpha receptor 1, TNF-alpha receptor 2, free fatty acids, glucose, insulin and a cholesterol panel, and CBC. A urine pregnancy test will be done. Patients will be asked to recall the food they consumed over the past 24 hours. A bionutritionist will measure height, weight, waist, hip, chest, arm, neck and thigh circumference. Subjects will be instructed to practice adequate birth control throughout the study. Serum will be stored for etanercept antibody testing. 