My fasting glucose has been 115 for years. My A1c was 6.2. When I was given the diagnosis of prediabetic, I lost 30 lbs by not eating anything that was processed, ie. sold in a box or a bag. Hard to do! Over 2 years I lost 30lbs so my BMI is 23.8 normal. My A1c came down to 5.7, still prediabetic, but lower than before.