Diabetic ketoacidosis (DKA) is a state of absolute or relative insulin deficiency aggravated by ensuing hyperglycemia, dehydration, and acidosis-producing derangement in intermediary metabolism. The most common causes are underlying infection, disruption of insulin treatment, and new onset of diabetes.
Diabetic ketoacidosis is typically characterized by hyperglycemia over 300 mg/dL, low bicarbonate level (less than 15 mEq/L), and acidosis (pH less than 7.30) with ketonemia and ketonuria. While definitions vary, moderate DKA can be categorized by pH of less than 7.2 and serum bicarbonate of less than 10 mEq/L, whereas severe DKA has pH less than 7.1 and bicarbonate of less than 5 mEq/L. Mental status changes can be seen with mild-to-moderate DKA with more severe deterioration in mental status typical with moderate-to-severe DKA.For the Pathophysiology, you can read more here.
For now, better watch your sweet food intakes coz V-day is approaching.