Type 2 Diabetes
What is Type 2 diabetes?
Type 2 diabetes is a chronic condition that affects how your body processes blood sugar, also called glucose. Your body either resists the effects of insulin or does not produce enough insulin to maintain normal glucose levels. Insulin is a hormone made by your pancreas that helps move sugar from your bloodstream into your cells for energy.
When you have type 2 diabetes, sugar builds up in your bloodstream instead of entering your cells. Over time, high blood sugar levels can damage your blood vessels, nerves, eyes, kidneys, and heart. Type 2 diabetes accounts for about 90 to 95 percent of all diagnosed diabetes cases in adults.
Unlike type 1 diabetes, which usually starts in childhood, type 2 diabetes most often develops in adults over age 45. However, more children and young adults are now being diagnosed due to rising obesity rates. The good news is that type 2 diabetes can often be prevented or managed through lifestyle changes and medication when needed.
Symptoms
- Increased thirst and frequent urination
- Increased hunger, especially after eating
- Feeling tired or fatigued throughout the day
- Blurred vision that comes and goes
- Slow healing of cuts and bruises
- Frequent infections, especially skin or gum infections
- Tingling or numbness in hands or feet
- Dark patches of skin, usually in armpits or neck
- Unintended weight loss
Many people with type 2 diabetes have no symptoms for years. The condition develops slowly, and symptoms can be mild at first. Some people only discover they have diabetes through routine blood work or when complications develop.
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Causes and risk factors
Type 2 diabetes develops when your body becomes resistant to insulin or when your pancreas cannot produce enough insulin. Being overweight or obese is the biggest risk factor, especially when you carry excess weight around your abdomen. Physical inactivity makes insulin resistance worse. Your risk also increases with age, particularly after 45. Genetics play a role too, with higher rates among Black, Hispanic, Native American, and Asian American people.
Other risk factors include having prediabetes, gestational diabetes during pregnancy, or polycystic ovary syndrome. High blood pressure and abnormal cholesterol levels often occur alongside insulin resistance. Poor sleep quality and chronic stress can affect blood sugar regulation. Eating a diet high in processed foods, refined carbohydrates, and sugary drinks increases your risk significantly.
How it's diagnosed
Type 2 diabetes is diagnosed through blood tests that measure your blood sugar levels. Your doctor may order a fasting plasma glucose test, which checks your blood sugar after an overnight fast. An A1C test measures your average blood sugar over the past 2 to 3 months. A random plasma glucose test can be done at any time, regardless of when you last ate.
Additional blood tests can help assess your overall metabolic health and diabetes risk. Tests like triglycerides, direct LDL cholesterol, and adiponectin provide important information about how diabetes affects your body. Low adiponectin levels are often seen in people with type 2 diabetes and indicate insulin resistance. High triglycerides and LDL cholesterol are common in people with diabetes and increase heart disease risk. Talk to your doctor about which tests are right for monitoring your condition.
Treatment options
- Lose weight if you are overweight, even 5 to 7 percent of body weight helps
- Exercise regularly, aiming for at least 150 minutes of moderate activity per week
- Eat a balanced diet focused on vegetables, lean proteins, and whole grains
- Limit refined carbohydrates, sugary foods, and processed snacks
- Monitor your blood sugar levels as recommended by your doctor
- Take prescribed medications such as metformin, which helps lower blood sugar
- Consider medications like GLP-1 agonists or SGLT2 inhibitors if needed
- Manage stress through meditation, yoga, or other relaxation techniques
- Get 7 to 9 hours of quality sleep each night
- Work with a registered dietitian for personalized meal planning
- Check your feet daily for cuts or sores that heal slowly
- See your doctor regularly to monitor for complications
Frequently asked questions
Type 1 diabetes is an autoimmune condition where your body attacks insulin-producing cells in the pancreas. Type 2 diabetes occurs when your body becomes resistant to insulin or does not produce enough. Type 1 usually starts in childhood and always requires insulin, while type 2 typically develops in adults and can often be managed with lifestyle changes and oral medications.
Type 2 diabetes can sometimes be put into remission through significant weight loss, diet changes, and exercise. However, remission does not mean the diabetes is cured. You still need to maintain healthy habits and monitor your blood sugar. If you return to old habits, diabetes often comes back.
A fasting blood sugar level of 126 milligrams per deciliter or higher on two separate tests indicates diabetes. An A1C level of 6.5 percent or higher also confirms diabetes. A random blood sugar of 200 milligrams per deciliter or higher with symptoms is another diagnostic criteria.
Testing frequency depends on your treatment plan and how well controlled your diabetes is. If you take insulin, you may need to test multiple times daily. If you manage diabetes with diet alone or oral medications, your doctor may recommend less frequent testing. Always follow your healthcare provider's specific recommendations for your situation.
A normal A1C level is below 5.7 percent. An A1C between 5.7 and 6.4 percent indicates prediabetes. An A1C of 6.5 percent or higher indicates diabetes. For people with diabetes, most doctors recommend keeping A1C below 7 percent to reduce complication risk.
Yes, you can eat fruit in moderation. Fruit contains natural sugars but also provides fiber, vitamins, and minerals. Choose whole fruits over fruit juice, which lacks fiber and can spike blood sugar quickly. Berries, apples, and citrus fruits are good choices. Watch your portion sizes and pair fruit with protein or healthy fat to slow sugar absorption.
Adiponectin is a hormone produced by fat tissue that helps regulate blood sugar and break down fatty acids. People with type 2 diabetes often have low adiponectin levels. Low adiponectin is linked to insulin resistance, a key feature of type 2 diabetes. Losing weight and exercising can help increase adiponectin levels.
Insulin resistance affects how your body processes fats, not just sugar. People with type 2 diabetes often have high triglycerides, high LDL cholesterol, and low HDL cholesterol. This pattern, called diabetic dyslipidemia, increases heart disease risk. Managing blood sugar, losing weight, and eating healthy fats can improve cholesterol levels.
Uncontrolled diabetes can damage blood vessels and nerves throughout your body. Common complications include heart disease, stroke, kidney disease, eye damage that can lead to blindness, and nerve damage causing pain or numbness. Diabetes also increases risk of foot problems, skin infections, and hearing impairment. Good blood sugar control significantly reduces these risks.
Losing 5 to 7 percent of your body weight if overweight can cut your diabetes risk by nearly 60 percent. Exercise at least 150 minutes per week with activities like brisk walking. Eat more vegetables, whole grains, and lean proteins while limiting processed foods and sugary drinks. These lifestyle changes are more effective than medication for preventing type 2 diabetes.