Counting carbohydrates: Dietary fiber may be listed underneath the listing for total carbohydrates. Dietary fiber is not digested by the body and can be subtracted from the total amount of carbohydrates present in food. This gives the net carbohydrates and will give a more accurate count of how much of the carbohydrates that affect blood sugar are present.
Metformin is likely effective for as long as 10 years, based on long-term follow-up of patients in the Diabetes Prevention Program (DPP). In this trial, investigators randomized 3234 at-risk patients to 3 groups: metformin 850 mg twice daily; lifestyle modification (7% weight loss, 150 minutes of physical activity per week, and a one-to-one 16-lesson curriculum covering diet, exercise, and behavior modification); or placebo.4 At a mean 2.8-year follow-up, the incidence of diabetes was 31% lower in the metformin group (95% confidence interval [CI], 17%-43%) and 58% lower in the lifestyle modification group than in the placebo group (95% CI, 48%-66%; P<.001 for both comparisons).
Even if you have not been told that you have prediabetes, you could be worried about it, since 90% of the people with prediabetes are unaware that they have it. You are at higher risk if you are over 45 years old, do not get much exercise, have a family history of diabetes, or are African American, Native American, Hispanic/Latino, or Pacific Islander. 
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