Prediabetes Explained: Risks, Reversal, and 2026 Outlook

Prediabetes is a health condition where blood sugar levels are higher than normal but not yet high enough to be diagnosed as type 2 diabetes. According to the Centers for Disease Control and Prevention (CDC), over 98 million American adults have prediabetes, yet more than 80% don’t know they have it. The good news: prediabetes is reversible with lifestyle changes. This guide explains what prediabetes is, who’s at risk, how it’s diagnosed, and what you can do to prevent it from progressing to diabetes.

What Is Prediabetes?

Prediabetes is a metabolic state characterized by blood glucose levels that are elevated above normal but below the threshold for type 2 diabetes. It is often called the “gray area” between normal blood sugar and diabetes. The American Diabetes Association (ADA) defines prediabetes as having an HbA1c of 5.7% to 6.4%, a fasting plasma glucose of 100–125 mg/dL, or a 2-hour oral glucose tolerance test of 140–199 mg/dL. In 2026, the ADA continues to endorse these criteria, which are used worldwide.

Why Prediabetes Matters

Prediabetes is not just a warning sign; it’s a critical window for intervention. Without action, up to 70% of people with prediabetes will eventually develop type 2 diabetes. However, lifestyle interventions can reduce that risk by up to 58%, according to the Diabetes Prevention Program (DPP) study. Early detection and management can also prevent or delay complications like heart disease, stroke, and kidney damage.

Who Is This For?

This guide is for anyone who wants to understand prediabetes: those newly diagnosed, individuals with risk factors like obesity or a family history of diabetes, and caregivers looking for clear, actionable information. It’s also for anyone who wants to take proactive steps to maintain healthy blood sugar levels.

How Is Prediabetes Diagnosed?

Doctors typically use one of three blood tests to diagnose prediabetes. The HbA1c test reflects average blood sugar over two to three months. A fasting plasma glucose test measures blood sugar after an overnight fast. An oral glucose tolerance test measures blood sugar two hours after drinking a sugary solution. These tests are recommended for adults aged 35 and older, according to the U.S. Preventive Services Task Force (USPSTF).

What Are the Diagnostic Criteria?

The table below summarizes the diagnostic thresholds set by the ADA. If your results fall in the prediabetes range, your healthcare provider may recommend confirmatory testing.

Test	Normal	Prediabetes	Diabetes
HbA1c	Below 5.7%	5.7% to 6.4%	6.5% or higher
Fasting Plasma Glucose	Below 100 mg/dL	100–125 mg/dL	126 mg/dL or higher
Oral Glucose Tolerance Test (2-hour)	Below 140 mg/dL	140–199 mg/dL	200 mg/dL or higher

What Causes Prediabetes?

Prediabetes occurs when the body becomes resistant to insulin or when the pancreas fails to produce enough insulin to maintain normal blood sugar levels. Insulin resistance is often driven by excess body fat, particularly around the abdomen, and physical inactivity. Genetics also play a role: having a family history of type 2 diabetes increases your risk.

What Are the Risk Factors?

Several factors increase the likelihood of developing prediabetes. According to the CDC, these include being overweight (with a body mass index over 25), being 45 or older, having a parent or sibling with type 2 diabetes, being physically active less than three times per week, and having a history of gestational diabetes. Additionally, certain racial and ethnic groups, including African Americans, Hispanic Americans, Native Americans, and Asian Americans, are at higher risk.

Can Prediabetes Be Reversed?

Yes, prediabetes is often reversible. The landmark Diabetes Prevention Program (DPP) study, funded by the National Institutes of Health (NIH), found that losing 5-7% of body weight and engaging in 150 minutes of moderate physical activity per week reduced the risk of progressing to type 2 diabetes by 58%. This effect was greater than that of metformin, which reduced risk by 31%.

What Lifestyle Changes Work?

Focus on sustainable changes. Aim to lose 5-7% of your starting weight. Increase physical activity to at least 150 minutes per week, such as brisk walking. Incorporate more fiber-rich foods like vegetables, whole grains, and legumes. Limit sugary beverages and refined carbohydrates. The National Diabetes Prevention Program (National DPP), a CDC-led initiative, offers structured lifestyle change programs that have been shown to cut diabetes risk by 58%.

How Is Prediabetes Treated?

Treatment for prediabetes typically begins with lifestyle modification. In some cases, healthcare providers may prescribe metformin, especially for those with a BMI above 35, those under 60, or women with a history of gestational diabetes. However, lifestyle changes remain the first-line recommendation.

What Is the Prognosis?

With early intervention, many people with prediabetes can return to normal blood sugar levels. The longer you have prediabetes without intervention, the higher the risk of progression to type 2 diabetes. Over 5-10 years, a significant proportion of people with prediabetes develop diabetes if no changes are made.

How Does Prediabetes Compare to Diabetes?

Prediabetes and type 2 diabetes are on the same continuum of blood sugar dysregulation. The key difference is the degree of hyperglycemia. In prediabetes, blood sugar is elevated but not to diabetic levels. While diabetes often requires medication and carries a higher risk of complications like retinopathy, neuropathy, and kidney disease, prediabetes is primarily managed with lifestyle changes and has a high potential for reversal.

What Are the Complications of Untreated Prediabetes?

If left untreated, prediabetes can progress to type 2 diabetes, which brings a host of complications. Even in the prediabetic state, there is an increased risk of cardiovascular disease and stroke. The American Heart Association (AHA) notes that insulin resistance is linked to higher blood pressure and abnormal cholesterol levels, contributing to heart disease risk.

When Should You Get Tested?

The ADA recommends screening for prediabetes and type 2 diabetes in adults aged 35 and older who are overweight or obese. If you have additional risk factors, such as high blood pressure or a family history, your provider may recommend testing earlier or more frequently. The USPSTF also recommends screening in adults aged 35-70 who are overweight or obese.

How Can You Prevent Prediabetes?

Preventing prediabetes involves the same lifestyle measures used to reverse it. Maintain a healthy weight, stay active, and eat a balanced diet. The World Health Organization (WHO) emphasizes the role of physical activity and healthy eating in preventing noncommunicable diseases, including diabetes. Regular check-ups with your healthcare provider can help you monitor your blood sugar levels.

What Are the Latest 2026 Guidelines?

In 2026, the ADA continues to recommend the same diagnostic criteria for prediabetes. However, recent research, such as the 2025 study published in The Lancet Diabetes & Endocrinology, suggests that personalized interventions based on genetic risk may improve prevention outcomes. The WHO has also updated its guidance to include digital health interventions for diabetes prevention, reflecting the growing role of technology in healthcare.

Frequently Asked Questions

Can prediabetes cause symptoms?

Most people with prediabetes have no symptoms. Some may experience darkened skin in areas like the neck or armpits (acanthosis nigricans), but this is not universal. That’s why screening is important.

How long does it take to reverse prediabetes?

Reversal can happen in as little as 6 months to a year with consistent lifestyle changes. The exact timeline varies based on starting weight, genetics, and adherence.

Is prediabetes the same as insulin resistance?

Prediabetes is a clinical diagnosis based on blood sugar levels, while insulin resistance is a physiological state where cells don’t respond well to insulin. Not everyone with insulin resistance has prediabetes, but it’s a precursor.

Do I need medication for prediabetes?

Not always. Lifestyle changes are the first line of defense. Metformin may be prescribed for individuals at high risk, but it’s not a substitute for healthy habits.

Can prediabetes go away permanently?

Yes, if you maintain a healthy weight and lifestyle, you can keep blood sugar in the normal range indefinitely. However, the risk of recurrence increases if you regain weight or become inactive.

Now That You Understand the Basics

You’ve learned that prediabetes is a reversible condition that affects millions. The key takeaways: get tested if you’re at risk, adopt lifestyle changes, and work with your healthcare provider to monitor your progress. For more in-depth information, explore our guides on healthy eating for blood sugar control and exercise tips for diabetes prevention.