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What Is Type 2 Diabetes?
Type 2 diabetes means your blood sugar stays higher than it should because your body does not use insulin well enough, or your pancreas cannot keep up with the amount of insulin your body needs.
It often develops slowly and may have no obvious symptoms at first.
Plain English
Insulin helps move glucose from the blood into cells for energy. In type 2 diabetes, cells respond less to insulin and the pancreas may not keep up, so glucose builds up in the bloodstream.
Why it matters
Uncontrolled blood sugar can damage blood vessels and nerves over time, raising risk for heart disease, stroke, kidney disease, vision problems, neuropathy, and foot complications.
What the numbers mean
A1C below 5.7% is normal; 5.7%–6.4% is prediabetes; 6.5% or higher (confirmed) is diabetes. Fasting glucose below 100 mg/dL is normal; 100–125 mg/dL is prediabetes; 126 mg/dL or higher (confirmed) is diabetes.
How it progresses
Insulin resistance can lead to prediabetes, then type 2 diabetes, and—if uncontrolled—long-term complications. Lifestyle changes, weight management, medication when prescribed, and regular monitoring can help reduce that risk.
How diet and exercise help
High-fiber carbohydrates, balanced meals, fewer sugary drinks and ultra-processed foods, and consistent activity can support healthier blood sugar alongside medical care.
Metrics to monitor
Home metrics include glucose readings, A1C trend, carbohydrate intake, weight, blood pressure, sleep, and symptoms. Report-based metrics include A1C, glucose, cholesterol, triglycerides, kidney function, electrolytes, liver enzymes, and blood pressure trends.
Common questions
What A1C level means diabetes?
An A1C of 6.5% or higher is commonly used as one diagnostic threshold for diabetes when confirmed by appropriate testing and reviewed by a healthcare provider.
What is prediabetes?
Prediabetes means blood sugar is higher than normal but not yet in the diabetes range. An A1C from 5.7% to 6.4% is commonly considered prediabetes.
Can type 2 diabetes have no symptoms?
Yes. Type 2 diabetes can develop slowly over years, and some people have no noticeable symptoms at first.
Can type 2 diabetes be reversed?
Some people achieve major improvement or remission with weight loss, lifestyle changes, and medical care, though ongoing monitoring is still important.