The original blood glucose is normal, suddenly blood glucose 6.2mmo/L, first of all should be clear that the blood glucose value for the fasting blood glucose, postprandial 2 hours of blood glucose, if for the fasting blood glucose, slightly higher than the normal level, consider that may be related to diet, stress and so on. If it is caused by eating too much sweets, you can eat less sweets and carbohydrates, and eat more low-fat, low-sugar, low-salt, high-fiber diet in moderation. Control the total amount of diet, eat more coarse grains, cereals, balanced nutrition, you can eat winter melon, bamboo shoots, fungus, mushrooms, onions, carrots and other vegetables, try to eat as little as possible, try not to eat candy, sugary drinks and pastries. You can have appropriate aerobic exercise, such as brisk walking, jogging, swimming, playing tai chi and other sports, exercise is conducive to improve insulin sensitivity, reduce high blood sugar after meals, you need to test your blood sugar regularly. If the blood glucose 6.2 mmo/L is 2 hours after meal or random blood glucose, it is within the normal range. If you find elevated blood glucose, and high blood glucose is difficult to adjust through exercise and diet, it is recommended to go to the hospital in time, and choose the appropriate medication under the guidance of the doctor for treatment.