Signs and Symptoms        •         Prediabetes Causes    •     Risk Factors    •     Medical Advice    •     Screening and diagnosis    •     Prediabetes Treatment    •     Prevention prediabetes    •     Complementary and alternative medicine

Prediabetes is a condition in which your blood sugar level is higher than normal, but not high enough to be classified as type 2 diabetes. Still, the stakes are high. If you have prediabetes, the long-term damage of diabetes – especially to your heart and circulatory system – may already be starting.
In the United States, 54 million adults have prediabetes, according to the American Diabetes Association. Without intervention, prediabetes is likely to become type 2 diabetes in as little as 10 years.
There’s good news, however. Progression from prediabetes to type 2 diabetes isn’t inevitable. With healthy lifestyle changes – such as eating healthy foods, including physical activity in your daily routine and maintaining a healthy weight – you may be able to bring your blood sugar level back to normal.

Signs and symptoms

Often, prediabetes has no signs or symptoms. But it’s important to watch for the classic red flags of type 2 diabetes, including:

  • Increased thirst
  • Frequent urination
  • Extreme hunger
  • Unexplained weight loss
  • Fatigue
  • Blurred vision
  • Slow-healing sores or frequent infections


To understand prediabetes, first you must understand how sugar (glucose) is normally processed in the body.
Glucose is a main source of energy for the cells that make up your muscles and other tissues. Glucose comes from two major sources: the food you eat and your liver. During digestion, sugar is absorbed into the bloodstream. Normally, sugar then enters cells with the help of insulin.
The hormone insulin comes from the pancreas, a gland located just behind the stomach. When you eat, your pancreas secretes insulin into your bloodstream. As insulin circulates, it acts like a key by unlocking microscopic doors that allow sugar to enter your cells. Insulin lowers the amount of sugar in your bloodstream. As your blood sugar level drops, so does the secretion of insulin from your pancreas.
Your liver acts as a glucose storage and manufacturing center. When your insulin levels are low – when you haven’t eaten in a while, for example – your liver releases the stored glucose to keep your glucose level within a normal range.
When you have prediabetes, this process begins to work improperly. Instead of moving into your cells, sugar builds up in your bloodstream. This occurs when your pancreas doesn’t make enough insulin or your cells become resistant to the action of insulin. Exactly why this happens is uncertain, although excess fat – especially abdominal fat – and inactivity seem to be important factors.

Risk factors

The same factors that increase the risk of developing type 2 diabetes increase the risk of developing prediabetes, including:

  • Weight. Being overweight is a primary risk factor for prediabetes. The more fatty tissue you have – especially around your abdomen – the more resistant your cells become to insulin.
  • Inactivity. The less active you are, the greater your risk of prediabetes. Physical activity helps you control your weight, uses up glucose as energy and makes your cells more sensitive to insulin.
  • Age. The risk of prediabetes increases as you get older, especially after age 45. Often, that’s because people tend to exercise less, lose muscle mass and gain weight as they age. But diabetes is also increasing dramatically among children, adolescents and younger adults.
  • Family history. The risk of prediabetes increases if a parent or sibling has type 2 diabetes.
  • Race. Although it’s unclear why, people of certain races – including blacks, Hispanics, American Indians and Asian-Americans – are more likely to develop prediabetes.
  • Gestational diabetes. If you developed gestational diabetes when you were pregnant, your risk of later developing diabetes increases. If you gave birth to a baby who weighed more than 9 pounds, you’re also at increased risk of diabetes.
  • Polycystic ovary syndrome. For women, having polycystic ovary syndrome – a common condition characterized by irregular menstrual periods, excess hair growth and obesity – increases the risk of diabetes.

Other conditions associated with diabetes include:

  • High blood pressure
  • High levels of low-density (LDL), or “bad,” cholesterol
  • Low levels of high-density lipoprotein (HDL), or “good,” cholesterol
  • High levels of triglycerides, another fat in the blood

When these conditions occur together along with resistance to insulin and obesity, particularly around the waist, it’s sometimes called metabolic syndrome. Metabolic syndrome is a precursor to diabetes.

When to seek medical advice

Consult your doctor if you’re concerned about diabetes or if you notice any type 2 diabetes symptoms – increased thirst and frequent urination, extreme hunger, weight loss, fatigue, blurred vision, and slow-healing sores or frequent infections.
Ask your doctor about blood glucose screening if you have any risk factors for prediabetes. For example:

  • You’re overweight.
  • You’re inactive.
  • You’re age 45 or older.
  • You have a family history of type 2 diabetes.
  • You’re black, Hispanic, American Indian or Asian-American.
  • You developed gestational diabetes when you were pregnant or gave birth to a baby who weighed more than 9 pounds.
  • You have polycystic ovary syndrome.
  • You have high blood pressure.
  • You have high LDL cholesterol, low HDL cholesterol or high triglycerides.

In fact, the American Diabetes Association recommends routine blood glucose screening for everyone beginning at age 45.

Screening and diagnosis

Your doctor may suggest one of two blood tests to screen for prediabetes:

  • Fasting blood sugar test. A blood sample will be taken after you fast for at least eight hours or overnight. With this test, a blood sugar level lower than 100 milligrams per deciliter (mg/dL) is normal. A blood sugar level from 100 to 125 mg/dL is considered prediabetes. This is sometimes referred to as impaired fasting glucose (IFG). A blood sugar level of 126 mg/dL or higher may indicate diabetes.
  • Oral glucose tolerance test. A blood sample will be taken after you fast for at least eight hours or overnight. Then you’ll drink a sugary solution, and your blood sugar level will be measured again after two hours. A blood sugar level less than 140 mg/dL is normal. A blood sugar level from 140 to 199 mg/dL is considered prediabetes. This is sometimes referred to as impaired glucose tolerance (IGT). A blood sugar level of 200 mg/dL or higher may indicate diabetes.

If your blood sugar level is normal, your doctor may recommend a screening test every three years. If you have prediabetes, you may need more frequent screening tests – likely every year or two.


If you have prediabetes, healthy lifestyle choices can help you bring your blood sugar level back to normal.

  • Eat healthy foods. Choose foods low in fat and calories. Focus on fruits, vegetables and whole grains. Strive for variety to help you achieve your goals without compromising taste or nutrition.
  • Get more physical activity. Aim for 30 minutes of moderate physical activity a day. Take a brisk daily walk. Ride your bike. Swim laps. If you can’t fit in a long workout, break it up into smaller sessions spread throughout the day.
  • Lose excess pounds. If you’re overweight, losing just 5 percent to 10 percent of your body weight – only 10 to 20 pounds, if you weigh 200 pounds – can reduce the risk of developing type 2 diabetes. To keep your weight in a healthy range, focus on permanent changes to your eating and exercise habits. Motivate yourself by remembering the benefits of losing weight, such as a healthier heart, more energy and improved self-esteem.

Sometimes medication – such as the oral diabetes drug metformin (Glucophage) – also is an option. In other cases, medication to control high blood pressure or cholesterol is needed. Healthy lifestyle choices remain essential, however.


Healthy lifestyle choices can help you prevent prediabetes and its progression to type 2 diabetes – even if diabetes runs in your family.

  • Eat healthy foods.
  • Get more physical activity.
  • Lose excess pounds.

If the list looks familiar, you’re onto something. The same lifestyle changes that can treat or even reverse prediabetes help prevent the condition, too.

Complementary and alternative medicine

Many alternative therapies – including beta glucans, bitter melon, cassia cinnamon, ginseng, gymnema and stevia – have been touted as possible ways to treat or prevent type 2 diabetes. However, there’s no conclusive evidence that any of these alternative therapies are effective.
If you’re considering dietary supplements or other alternative therapies to treat or prevent prediabetes, consult your doctor. He or she can help you weigh the pros and cons of specific alternative therapies.