In middle aged and older individuals with T2DM and additional risk factors for cardiovascular disease, and on a background therapy of basal insulin (insulin glargine) and metformin, the addition of the GLP-1 analogue, exenatide, reduces glycemic variability more than the addition of a rapid-acting-analogue (RAA) (insulin aspart, insulin glulisine or insulin lispro) during an active treatment period of 26 weeks.