In a non diabetic person, fasting blood glucose should be less than 100. In someone with diabetes, the target fasting blood glucose depends on the age of the patient, duration of diabetes and presence of co morbidities, and risk of hypoglycaemia. It’s different for different people.

Your question requires more details. Fasting sugar should be between 72-110 mg %. Sugar levels should be less than 140 mg% after any meal or when check randomly. A diabetic should eat a balanced diet. Salads , sprouts, citrus fruits in moderation should be consumed along with our traditional foods like roti sabzi and a moderate amount of rice. For a detailed diet chart it’ll be prudent to connect with a dietitian.