MicroRNA-30 is identified as being dysregulated in adipose tissue macrophages during obesity and can be used in treatment of disease in which adipose tissue macrophage polarization dysregulation plays a part. Increased concentration of microRNA-30, e.g., via pharmaceutical delivery, can decrease the polarization of macrophages, and in particular adipose tissue macrophages, to inflammatory M1 phenotype and can decrease expression of pro-inflammatory cytokines. One or more members of the miR-30 family can be utilized in the methods. Methods can be beneficial in treatment of a large number of inflammatory diseases including obesity, diabetes, cancer, autoimmune, etc.