At what blood sugar levels does the risk of damage to bodily systems increase, and what are the potential consequences of prolonged hyperglycemia?

The American Diabetes Association (ADA) recommends an A1C below 7.4, equivalent to a blood sugar level of 166, which is too high. Damage from high blood sugar begins above 100. A study shows that fasting blood glucose between 110 and 125 can destroy 40% of pancreatic beta cells, leading to less insulin and more damage. The ideal A1C is under 5%. To improve your levels, consider reducing refined carbs and sugar, and try intermittent fasting, which may help reverse damage if addressed early.