Both basal and postprandial elevations contribute to the hyperglycemic exposure of diabetes, but current therapies are mainly effective in controlling the basal component.
Postprandial Blood Glucose - American Diabetes
The diagram illustrates how glucose transport changes across basal, postprandial, and fed states.In the fasting or basal state, glucose levels in the intestinal lumen are relatively low.

Prandial insulin is safe and effective for reducing HbA1c and postprandial glucose levels in patients with a high BeAM value- Read the full article online.
Contributions of Basal and Postprandial Hyperglycemia Over a Wide Range of A1C Levels Before and After Treatment Intensification in Type 2 Diabetes. Diabetes Care 2011;34:250825.

Contributions of basal glucose and postprandial glucose concentrations to hemoglobin A1c in the newly diagnosed patients with type 2 diabetesthe preliminary study. Diabetes Technol Ther.
Second, both basal and postprandial ISR in relation to plasma glucose were not different in our Ob-NFG-NGT subgroups that were either insulin sensitive or insulin resistant.Normal fasting plasma glucose levels and type 2 diabetes in young men.