The normal range of fasting insulin is 3.9-6.1 mmol/L. The sugar in the body fluctuates as it is metabolized by the liver or absorbed by the gastrointestinal tract. If the human body is overly hungry or has other systemic diseases in the body, such as thyroid system disease, hyperthyroidism, the basal metabolic rate increases, and the metabolism of sugar in the human body will also increase compensatingly, which in serious cases will lead to hypoglycemia, dizziness, weakness, difficulty in breathing and even a slowed heart rate. If you have diabetes and have poor diet control, it will lead to high blood sugar in your body, exceeding the normal range, resulting in hyperglycemia, increased sugar, increased fat metabolism and even diabetic ketoacidosis, which can be life-threatening in serious cases and requires timely treatment.