What Is Prediabetes?

Prediabetes is a health condition in which blood sugar (glucose) levels are higher than normal but not high enough to be classified as type 2 diabetes. It’s an intermediate stage between normal glucose regulation and overt diabetes.

Because prediabetes may have no obvious symptoms, many people don’t know they have it. It signals an elevated risk for developing type 2 diabetes and other metabolic complications.

How Common Is Prediabetes?

• In the U.S., many millions of adults have prediabetes — most are unaware of it (CDC estimates).
• Globally, prevalence is rising, particularly in older adults, people with obesity, and those with other metabolic risk factors.

Causes & Risk Factors

Pathophysiology

• Insulin resistance: muscle, fat, and liver cells respond less effectively to insulin.
• The pancreas compensates by producing more insulin; over time this is insufficient and glucose rises.

Risk Factors

• Overweight or obesity (especially abdominal fat)
• Physical inactivity
• Family history of type 2 diabetes
• Older age
• Certain ethnic/racial backgrounds (higher risk in some groups)
• History of gestational diabetes
• High blood pressure, abnormal lipids, or PCOS

Symptoms & Warning Signs

Most people with prediabetes have no clear symptoms. If present, they may be subtle and non-specific:

• Darkened skin at neck or armpits (acanthosis nigricans)
• Skin tags
• Subtle eye changes

Absence of signs does not rule out prediabetes — screening matters if you have risk factors.

How Is Prediabetes Diagnosed?

Clinicians use standard lab tests. Ranges below reflect common ADA/EASD criteria:

Because values vary, repeat testing or combining tests is often used to confirm diagnosis.

Why Prediabetes Matters (Complications & Risks)

• Progression to type 2 diabetes: common within years without intervention.
• Cardiovascular risk: higher risk of heart disease, stroke, and vascular problems.
• Early organ changes: kidney, nerve, and retinal changes may begin pre-diabetes.

Prevention, Reversal & Management

Lifestyle Interventions (First-Line)

• Healthy eating: whole, minimally processed foods; limit refined carbs and added sugars.
• Physical activity: ~150 minutes/week moderate-intensity exercise.
• Weight loss: 5–10% body weight reduction can markedly cut risk.
• Prioritize sleep and stress management; avoid smoking and excess alcohol.
• Structured programs (e.g., CDC-recognized) are highly effective.

Medication & Other Measures

• Metformin may be considered for high-risk individuals when lifestyle alone is insufficient.
• Ongoing monitoring and support (education/coaching) help maintain momentum.

Screening & Who Should Be Tested

• USPSTF: screen adults aged 35–70 who are overweight or obese; refer those with prediabetes to lifestyle programs.
• Screen earlier if additional risk factors exist (family history, ethnicity, hypertension, dyslipidemia).
• Follow-up screening every 1–3 years for those at risk or with prior borderline results.

Outlook & Living with Prediabetes

• Reversion to normal glucose is possible, especially with early lifestyle changes.
• Build a care team (clinician, dietitian, coach/support group).
• Track A1C, fasting glucose, weight, and blood pressure to guide progress.
• Long-term success relies on practical planning, support, and steady habits.

References