Get fit, lose weight, eat low fat more vegetarian type food, get some skeletal muscle activation. There are aviation approved list of diabetes mdications, snd metformin is an ok one. The Gliptins are approved in our juristiction, sling with acarbose which is horrible to take. Sulphonylureas are not approved, and insulin is a no no for CPL level and above but in our country limited ( very specific)protocols are being trialled for insulin use for PPL's.