Prediabetes: Blood Sugar Range, Risk & Prevention

Prediabetes is a blood sugar level that is above normal but below the diabetes range.

Glucose is the sugar your body uses for energy. After you eat, glucose enters the bloodstream. Insulin, a hormone made by the pancreas, helps move that glucose from the blood into the body's cells.

With insulin resistance, the cells become less responsive to insulin. The pancreas may produce more insulin to keep blood sugar under control. For a while, this can work reasonably well. Over time, blood sugar may start to rise.

Prediabetes can appear alongside excess weight, high blood pressure, abnormal cholesterol and fatty liver. These problems often share some of the same underlying risk factors.

It is also possible to have prediabetes without looking overweight. Body weight alone does not tell you whether your blood sugar is healthy.

Prediabetes can be identified using HbA1c or blood glucose testing. The commonly used ranges are:

A diabetes-range result may need confirmation, particularly when you do not have typical symptoms.

Your doctor may also use another glucose test if the results are unclear or do not fit the rest of your clinical picture.

The number matters, but it is not the whole story. Your age, weight, family history, blood pressure, cholesterol and previous test results can all affect how your result is interpreted.

HbA1c is a blood test that gives an estimate of your average blood glucose over roughly the previous 2 to 3 months.

Haemoglobin is the protein inside red blood cells that carries oxygen. When glucose in the blood attaches to haemoglobin, it forms glycated haemoglobin. HbA1c measures this process.

Unlike a fasting glucose test, HbA1c usually does not require fasting.

An HbA1c between 5.7% and 6.4% generally falls into the prediabetes range.

HbA1c is useful, but it is not a perfect test for everyone. Certain blood disorders, changes in red blood cell lifespan and some haemoglobin variants can affect the result.

Haemoglobin E trait, for example, is seen in parts of South and Southeast Asia and may affect some HbA1c methods. If your HbA1c does not seem to match your glucose readings or symptoms, your doctor may consider another form of testing.

Usually, no.

Most people with prediabetes feel well and have no clear warning sign. This is why it is often found during a routine blood test.

Some people may notice increased thirst, frequent urination, tiredness or blurred vision when blood sugar is rising. These symptoms are more typical of diabetes, but symptoms alone cannot tell you whether you have prediabetes or diabetes.

If you have several risk factors, it is better to discuss testing rather than waiting for symptoms.

There is usually no single cause.

Prediabetes develops when the body has increasing difficulty keeping blood glucose within a healthy range. Insulin resistance is one of the main processes involved.

Several things can contribute.

Excess weight

Extra body fat, especially around the abdomen, is associated with insulin resistance.

This does not mean that every person with prediabetes needs to lose a large amount of weight. The right goal depends on your starting weight and overall health.

For people with excess weight who are at high risk of diabetes, losing around 5% to 7% of body weight is commonly used as a prevention target.

If weight is one of your main concerns, Medcare provides obesity and weight management.

Lack of regular physical activity

Muscles use glucose for energy. Regular movement helps the body use glucose more effectively.

Long periods of sitting and very little physical activity can make it harder to maintain good metabolic health.

You do not need to join a gym to become more active. Walking, cycling, household work, gardening and other activities can all add movement to your day.

Family history

A parent, brother or sister with Type 2 diabetes can increase your risk.

You cannot change your family history, but you can pay closer attention to the factors that are within your control.

High blood pressure and abnormal cholesterol

Prediabetes can occur together with high blood pressure and abnormal cholesterol or triglycerides.

When several of these problems occur together, it is worth looking at your overall cardiovascular and metabolic risk rather than treating the blood sugar result in isolation.

The risk is higher when several factors occur together.

These include:

• Overweight or obesity
• A larger waist circumference
• Low physical activity
• A parent or sibling with Type 2 diabetes
• Previous diabetes during pregnancy
• High blood pressure
• Abnormal cholesterol or triglycerides
• Increasing age
• Previous raised blood glucose
• Other conditions associated with insulin resistance

South Asian adults can develop metabolic problems, including Type 2 diabetes, at relatively lower body weights than some other populations. So, being slim does not automatically mean that your diabetes risk is low.

Your doctor can assess your risk using your blood reports, measurements and medical history together.

Prediabetes is diagnosed using blood tests. Symptoms by themselves are not enough.

HbA1c test

An HbA1c of 5.7% to 6.4% generally indicates prediabetes.

The test is convenient because fasting is usually not required. It also gives a longer-term picture than a single blood glucose reading.

Fasting blood glucose

Fasting plasma glucose measures your blood sugar after fasting as instructed by the laboratory or doctor.

A result from 100 to 125 mg/dL generally falls into the prediabetes range.

A fasting result of 126 mg/dL or more is in the diabetes range, although confirmation may be needed when symptoms are absent.

Oral glucose tolerance test

An oral glucose tolerance test checks how your body handles a measured amount of glucose.

It takes longer than a fasting glucose test and is used in selected situations. Your doctor may recommend it when other results are borderline or when a clearer answer is needed.

The main difference is the level of blood glucose.

With prediabetes, blood sugar is above the normal range but below the diagnostic range for diabetes.

With diabetes, blood glucose has reached the level used to make a diabetes diagnosis.

Prediabetes still deserves attention because it can indicate a higher future risk of Type 2 diabetes and cardiovascular disease.

At the same time, a prediabetes result does not mean that diabetes is certain to follow. It gives you an opportunity to act before the problem becomes more advanced.

Yes, it can.

Some people with prediabetes return to the normal glucose range after improving their diet, becoming more active and losing excess weight. The response is different from person to person.

The aim should not be to achieve one normal blood test and then return to old habits. Blood sugar tends to improve when the changes behind that improvement can be maintained.

If your HbA1c falls below 5.7%, that is a positive sign. You may still need periodic testing if you have other risk factors.

There is no single food, exercise or medicine that works for everyone. Prevention usually comes from several manageable changes made consistently.

Start with your usual food, not a completely new diet

You do not need to abandon Indian food because you have prediabetes.

Rice, roti, dal, vegetables, fish, eggs and curd can all fit into a balanced meal. The amount you eat and how these foods are combined matter.

For example, a meal built around a moderate serving of rice, plenty of vegetables, dal and a protein source is different from a large plate of rice followed by sweets and a sugary drink.

Keep an eye on portions

Even foods that are considered healthy can contribute a lot of calories or carbohydrate when portions become large.

Rice and roti are common examples. You do not necessarily need to remove them. Start by looking at how much you normally eat.

If you are unsure how to structure your meals, diabetes care can include practical dietary guidance based on your health and daily routine.

Cut back on sugary drinks

Sweet tea, soft drinks, packaged juices and other sugary beverages are easy to consume without feeling full.

If you drink several cups of sweet tea each day, reducing the sugar gradually may be more realistic than making a sudden change.

Water and unsweetened drinks can be useful alternatives.

Eat vegetables and pulses regularly

Vegetables, pulses and other fibre-rich foods can make meals more filling and support better blood glucose control.

Dal, beans and vegetables are already part of many Indian meals, so improving the balance of a familiar meal is often easier than following a completely unfamiliar diet.

Whole fruit is generally a better choice than fruit juice because you also get the fibre and have to chew the fruit.

Be sensible with sweets

Having prediabetes does not mean that you can never eat a sweet.

What matters is how often you eat sweets, how much you eat and what the rest of your diet looks like.

During Bihu, Durga Puja, weddings and family gatherings, sweets and rich foods may be part of the occasion. A smaller portion and avoiding repeated servings can make a difference.

Also remember that "sugar-free" does not always mean low in calories or carbohydrate.

Move more during the day

Regular activity helps muscles use glucose.

A daily walk can be a simple place to start. You can also build movement into your routine through household work, gardening, cycling, walking for short errands or taking regular breaks from sitting.

If you have been inactive for a long time, begin at a comfortable level and build up gradually.

Pay attention to sleep

Sleep affects appetite, energy and metabolic health.

If you snore loudly, wake up gasping, have witnessed pauses in breathing or feel unusually sleepy during the day, tell your doctor.

These symptoms can occur with obstructive sleep apnea, which is also linked with obesity, high blood pressure and Type 2 diabetes.

Medcare provides sleep apnea care and sleep studies when appropriate.

Avoid tobacco

Smoking and other tobacco use increase cardiovascular risk.

If you have prediabetes, reducing your overall cardiovascular risk is part of protecting your long-term health.

Look at alcohol as part of the bigger picture

Alcohol can add calories and may affect sleep, appetite and blood glucose in some people.

If you drink alcohol, the appropriate amount depends on your health, medicines and other risk factors. Your doctor can advise you based on your situation.

For high-risk adults with excess weight, losing around 5% to 7% of body weight is commonly used as a diabetes prevention target.

The target is not the same for everyone.

For example, a person weighing 100 kg would reach 5% weight loss after losing 5 kg. A person weighing 80 kg would reach 5% after losing 4 kg.

The aim is not rapid weight loss. Losing weight gradually and keeping it off is more useful than following a very restrictive plan for a few weeks.

Not everyone with prediabetes needs medicine.

For many people, the first step is to work on food habits, physical activity and weight where appropriate, followed by repeat assessment.

Some people have a higher risk and may need closer medical follow-up or medication. The decision depends on the person's glucose results, weight, age, previous history and other medical conditions.

Do not start, stop or change a medicine based only on something you have read online.

Yes. Having diabetes in the family increases your risk, but it does not determine what will happen to you.

You cannot change your genes or family history. You can, however, work on physical activity, weight, food habits, blood pressure and other factors that influence diabetes risk.

If several close family members have Type 2 diabetes, regular blood sugar checks can help identify changes early.

There is no single testing schedule that is right for every person.

Someone with a normal result but several risk factors may need repeat testing at an appropriate interval. Someone who already has prediabetes may need closer follow-up, especially if their HbA1c or fasting glucose is rising.

Your doctor can recommend when to repeat the test based on your results and risk factors.

A preventive health check-up may be useful when blood sugar needs to be considered alongside BP, weight and other health measurements.

Prediabetes can be associated with a higher cardiovascular risk, particularly when it occurs with high BP, abnormal cholesterol, obesity, smoking or other risk factors.

It does not mean that every person with prediabetes has heart disease.

The useful approach is to look at the complete picture. Blood pressure, cholesterol, weight, smoking, activity and family history all contribute to cardiovascular risk.

This is also why a blood sugar report should not be viewed in isolation.

Start by looking at the actual number.

"Borderline sugar" is not a formal diagnosis. People often use the phrase when blood glucose is above normal but not clearly in the diabetes range.

An HbA1c of 5.7% and an HbA1c of 6.4% are both within the prediabetes range, but they are not the same result. Your doctor will consider the number along with your other risk factors and previous reports.

Do not assume that a borderline result means you need lifelong diabetes medicine. It also should not be ignored.

Speak with a doctor if:

• Your HbA1c is between 5.7% and 6.4%.
• Your fasting blood glucose is repeatedly higher than normal.
• You have a strong family history of Type 2 diabetes.
• You have excess weight, high BP or abnormal cholesterol.
• You had diabetes during a previous pregnancy.
• You have increased thirst, frequent urination, unexplained weight loss or persistent tiredness.
• You are unsure whether your report indicates prediabetes or diabetes.

Get urgent medical help if you develop severe weakness, confusion, fainting, difficulty breathing, severe dehydration or other serious symptoms.

In an emergency, call 108 or 112.

At Medcare Diabetes & Obesity Clinic in North Bongaigaon, Dr. Das looks at blood sugar alongside weight, blood pressure and cardiovascular risk. HbA1c testing is available in-house, and the result is usually ready before the patient leaves.

Where appropriate, diabetes care, weight management and preventive health assessment can be considered together. The aim is to understand what your reports mean and what needs attention now.

• Prediabetes means blood sugar is above normal but below the diabetes range.
• HbA1c of 5.7% to 6.4% is generally in the prediabetes range.
• Most people with prediabetes do not have obvious symptoms.
• Excess weight, low activity, family history and other metabolic risk factors can increase the chance of developing Type 2 diabetes.
• A weight loss of around 5% to 7% can be a useful prevention target for appropriate high-risk adults with excess weight.
• Regular activity, sensible portions and a practical Indian eating pattern can help reduce diabetes risk.
• Prediabetes is a warning sign, not a guarantee that diabetes will develop.