This is a topic I am extremely interested in because there are conflicting experiences from medical literature and real life experience having drastically different outcomes a lot of the time, it would appear insulin potentiates and also dampens certain adrenergic functions. Personally I notice a potentiation of dopaminergic and beta adrenergic activity when using decent insulin doses. When I inject albuterol with insulin for example the effects are much more potent than albuterol alone. If the idea that insulin increases beta adrenergic activity is accurate it just shows how useful it could be for cutting fat.