Patients with methanol poisoning commonly present with normal blood glucose and negative for ketone bodies, whereas hyperglycemia and ketone positive conditions are associated with diabetes. We describe a case that matched the criteria for diabetic ketoacidosis and was treated according to the relevant guidelines and protocol. Although the acidosis was corrected quickly, the patient experienced a progressive decline in visual acuity. Review of the patient's medical records revealed a history of drinking self-prepared alcoholic drinks containing a high concentration of methanol. Methanol poisoning can present with symptoms of diabetic ketoacidosis in diabetes patients. Awareness of the condition and signs along with a detailed review of the patients' history can aid the differential diagnosis.