Get latest articles and stories on Health at LatestLY. Long-term blood sugar levels, known as HbA1c, can be used to accurately predict the risk of a person with type 1 diabetes having eye and kidney problems. According to research, this level should be lower than 53 mmol/mol (7%). The study tracked people for more than 30 years after they were diagnosed with type 1 diabetes. Health News | Study Reveals Minimum Blood Sugar Levels to Avoid Diabetes-related Problems.