Results from insulin resistance (a condition in which the body fails to properly use insulin), combined with relative insulin deficiency. Most Americans who are diagnosed with diabetes have type 2 diabetes
Type 2 diabetes, once known as adult-onset or noninsulin-dependent diabetes, is a chronic condition that affects the way your body metabolizes sugar (glucose), your body's main source of fuel.

When you have type 2 diabetes, your body is resistant to the effects of insulin — a hormone that regulates the movement of sugar into your cells — or your body doesn't produce enough insulin to maintain a normal glucose level. Untreated, the consequences of type 2 diabetes can be life-threatening.

There's no cure for type 2 diabetes, but you can manage — or even prevent — the condition. Start by eating healthy foods, exercising and maintaining a healthy weight. If diet and exercise aren't enough, you may need diabetes medications or insulin therapy to manage your blood sugar.

Type 2 diabetes symptoms may develop very slowly. In fact, you can have type 2 diabetes for years and not even know it. Look for:

• Increased thirst and frequent urination. As excess sugar builds up in your bloodstream, fluid is pulled from the tissues. This may leave you thirsty. As a result, you may drink — and urinate — more than usual.
• Increased hunger. Without enough insulin to move sugar into your cells, your muscles and organs become depleted for energy. This triggers intense hunger.
• Weight loss. Despite eating more than usual to relieve hunger, you may lose weight. Without the ability to use glucose, the body uses alternative fuels stored in muscle and fat. Calories are lost as excess glucose is released in the urine.
• Fatigue. If your cells are deprived of sugar, you may become tired and irritable.
• Blurred vision. If your blood sugar is too high, fluid may be pulled from the lenses of your eyes. This may affect your ability to focus clearly.
• Slow-healing sores or frequent infections. Type 2 diabetes affects your ability to heal and resist infections.
• Areas of darkened skin. Some people with type 2 diabetes have patches of dark, velvety skin in the folds and creases of their bodies — usually in the armpits and neck. This condition, called acanthosis nigricans, may be a sign of insulin resistance.