Prediabetes—elevated blood sugar not yet in the diabetic range—affects over 541 million people worldwide and is poised to reach 730 million by 2045. Early detection can prevent progression to type 2 diabetes and reduce risks like heart disease and nerve damage.

Here are seven subtle signs that warrant attention:

1. Darkened skin patches (acanthosis nigricans) on neck, armpits, and groin from insulin resistance.

2. Excessive thirst and urinary frequency, as kidneys purge extra glucose, causing dehydration.

3. Slow wound healing due to impaired circulation and immune function.

4. Blurred vision, from fluid shifts in eye lenses linked to high glucose.

5. Tingling or numbness in hands and feet—early neuropathy.

6. Unexplained fatigue, when cells struggle to use glucose for energy.

7. Unexpected weight changes, from shifts in fat storage or muscle breakdown.

These symptoms often go unnoticed. Regular screenings—via HbA1c, fasting glucose, or oral glucose tolerance tests—are key to spotting these warning signs. Early lifestyle changes—including balanced diet, increased exercise, and weight management—can reverse prediabetes and prevent type 2 diabetes.