Blood glucose of 30 mmol/L is very dangerous in this case. For type 1 diabetes, diabetic ketoacidosis and hyperglycemic hyperosmolar coma can easily occur in this case, and the mortality rate is relatively high. The mortality rate of hyperglycemic hyperosmolar coma can be as high as about 50%, and the mortality rate of diabetic ketoacidosis is as high as 20%-30%, which requires active rehydration and intravenous treatment with insulin. Even if acute complications do not occur, the damage to the body is greater in this case, and the fundus, kidneys, and retina are equivalent to being in a high-sugar environment, and the effects are more significant. There will often be obvious dry mouth, excessive drinking, polyuria, lethargy, eating more, and weight can even drop 20-30 pounds. It is necessary to actively treat with insulin, or even insulin pump intensive treatment, to restore blood sugar to normal as soon as possible, in order to lift high glucose toxicity, so as to avoid further damage to the body.