The present invention relates to modified or polymer conjugated MetAP2 inhibitors. The present invention also relates to methods of preventing, inducing, causing or increasing weight loss, treating obesity and/or treating metabolic syndrome utilizing the modified or polymer conjugated MetAP2 inhibitors. The present invention also relates to methods of improving insulin sensitivity and glycemic control, reducing insulin levels and/or improving leptin sensitivity utilizing the modified or polymer conjugated MetAP2 inhibitors.