In some examples, the disclosure relates to a systems, devices, and techniques for delivering electrical stimulation therapy to a patient. In some example, the disclosure relates to systems and methods of treating hyperglycemia in a patient including delivering gastric electrical stimulation (GES) to the patient. Devices, systems and methods according to the disclosure may comprise an implantable stimulator, a blood glucose monitor and/or a food intake sensor. In some examples, a blood glucose level and/or food intake of a patient is detected and GES is delivered to the patient in response to the detection.