How do normal people prevent diabetes and how high blood sugar is determined?

Normal people should first understand whether there is a family history of diabetes, if there is diabetes in the family should regularly test blood sugar, usually pay attention to healthy diet, eat less high-fat, high-calorie food, obese people also need to lose weight. Fasting blood sugar more than 7mmol/L or 2 hours after the meal blood sugar more than 11.1 mmol/L diagnosed as high blood sugar.