Prediabetes means blood sugar is higher than normal but not yet in the diabetes range. This stage offers a genuine window of opportunity to prevent progression.

Prediabetes describes blood sugar levels that are higher than normal but not yet high enough to meet the definition of type 2 diabetes. It affects a very large proportion of adults, and many people with prediabetes are unaware they have it, since it typically causes no symptoms and is identified through routine blood testing.

Importantly, prediabetes is not a guarantee of future diabetes — it represents a genuine window of opportunity, during which lifestyle changes have been shown in rigorous research to significantly reduce, and in some cases prevent entirely, progression to type 2 diabetes.

Understanding Your Diagnosis

Prediabetes is diagnosed through blood testing: a fasting blood sugar of 100-125 mg/dL, a hemoglobin A1c of 5.7-6.4%, or an oral glucose tolerance test result in a specific intermediate range, all indicate prediabetes rather than diabetes (which uses higher thresholds) or normal blood sugar (which uses lower ones). Any one of these tests meeting the prediabetes range is sufficient for diagnosis.

Risk factors for prediabetes include excess weight, particularly abdominal weight, physical inactivity, family history of diabetes, and certain ethnic backgrounds with higher population risk. Many major medical organizations recommend screening for adults starting around age 35, or earlier for those with additional risk factors.

Why Prediabetes Matters

Without intervention, a meaningful proportion of people with prediabetes go on to develop type 2 diabetes within several years, though this is far from inevitable. Even before progressing to full diabetes, prediabetes is associated with somewhat increased cardiovascular risk, making the case for addressing it proactively rather than waiting to see what happens.

The encouraging counterpoint is that structured lifestyle change, as demonstrated in large clinical trials like the Diabetes Prevention Program, can reduce progression to diabetes by more than half, and in some studies even more, making this one of the most impactful preventive interventions available in all of medicine.

Evidence-Based Prevention Strategies

Modest weight loss — generally 5-7% of body weight — combined with at least 150 minutes of moderate physical activity weekly, has been shown to be highly effective at preventing progression to diabetes, in some studies outperforming medication. This level of change, while requiring real commitment, is generally more achievable than dramatic weight loss goals and is associated with strong evidence of benefit.

Structured programs, such as the National Diabetes Prevention Program (available in person and online, often through community organizations or covered by insurance), provide accountability, education, and support that improve success rates compared to attempting lifestyle change entirely independently. Ask your doctor about local or virtual program options.

Monitoring Your Progress

Regular follow-up testing, typically annually, tracks whether your blood sugar is improving, remaining stable, or progressing toward diabetes, allowing your treatment approach to be adjusted accordingly. For some people at higher risk or with additional risk factors, medication (such as metformin) may be considered alongside lifestyle changes, though lifestyle intervention remains the foundation of prevention for most people.

Even if blood sugar does not fully normalize, meaningful improvement and delay of diabetes onset are valuable outcomes in their own right, and continued lifestyle efforts remain worthwhile regardless of the exact trajectory of your numbers over time.

Prediabetes Action Checklist

Confirm your specific test results and what they indicate about your risk
Set a realistic goal of 5-7% weight loss if you are overweight
Aim for at least 150 minutes of moderate physical activity weekly
Ask about the National Diabetes Prevention Program or similar structured programs
Reduce added sugars and refined carbohydrates in your diet
Schedule annual follow-up blood sugar testing to monitor your progress
Discuss whether medication might be appropriate alongside lifestyle changes for you specifically

When to Contact a Clinician

Ask your doctor about prediabetes screening if you have risk factors such as excess weight, family history of diabetes, or are over age 35. If you've been diagnosed with prediabetes, schedule regular follow-up to monitor your progress and discuss your personalized prevention plan.

Questions to Ask at a Medical Visit

What specific test showed my prediabetes, and what were my exact numbers?
What weight loss and activity goals would be most realistic and effective for me?
Are there local or virtual diabetes prevention programs you'd recommend?
Should I consider medication alongside lifestyle changes given my risk level?
How often should my blood sugar be rechecked to monitor progress?
What other risk factors, like cholesterol or blood pressure, should I also address?

Main Takeaway

Prediabetes means blood sugar is elevated but not yet in the diabetes range, and importantly, it is not an inevitable path to diabetes. Modest weight loss and regular physical activity, ideally through a structured program, have strong evidence for significantly reducing or preventing progression to type 2 diabetes.

References and Further Reading

Centers for Disease Control and Prevention — Prediabetes and the National Diabetes Prevention Program
American Diabetes Association — Prediabetes diagnostic criteria and management
National Institute of Diabetes and Digestive and Kidney Diseases — Diabetes Prevention Program research findings
U.S. Preventive Services Task Force — Screening for prediabetes and type 2 diabetes

Prediabetes: Understanding Your Risk and Taking Action