Gestational Diabetes: Symptoms, Testing, Diet, and Treatment

Gestational diabetes is a condition in which blood glucose levels become higher than recommended during pregnancy. It develops in people who did not have a known diagnosis of diabetes before becoming pregnant.

Most people with gestational diabetes do not notice clear symptoms. For this reason, routine blood-glucose screening is an important part of prenatal care. When the condition is identified and managed appropriately, many people have a healthy pregnancy and deliver a healthy baby.

Management may involve an individualized eating plan, pregnancy-appropriate physical activity, blood-glucose monitoring, prenatal follow-up, and medication when lifestyle measures alone do not maintain glucose within the recommended range.

What Is Gestational Diabetes?

Gestational diabetes mellitus, often abbreviated as GDM, is diabetes first diagnosed during pregnancy in someone who did not already have a known diagnosis of type 1 or type 2 diabetes.

Glucose is a form of sugar that circulates in the bloodstream and provides energy to the body’s cells. Insulin is a hormone produced by the pancreas that helps move glucose from the blood into the cells.

During pregnancy, hormones produced by the placenta can reduce the effectiveness of insulin. This is called insulin resistance. The pancreas usually responds by producing additional insulin.

Gestational diabetes develops when the body cannot produce enough insulin to compensate for the increased insulin resistance of pregnancy.

For a broader overview of healthy meals, folate, protein, iron, calcium, hydration, and food safety, read our complete pregnancy nutrition guide .

Why Does Gestational Diabetes Develop?

Insulin resistance normally increases as pregnancy progresses. This process helps make glucose and other nutrients available to the developing fetus.

In some pregnancies, the pancreas cannot produce enough insulin to maintain glucose within the desired range. Blood-glucose levels then rise.

Gestational diabetes is therefore influenced by hormonal, metabolic, genetic, and environmental factors. It is not simply the result of eating sugar or gaining an exact amount of weight.

People with balanced diets and active lifestyles can still develop gestational diabetes. Similarly, having one or more risk factors does not guarantee that the condition will occur.

Risk Factors for Gestational Diabetes

Gestational diabetes can occur without an obvious risk factor. However, the likelihood may be higher when a person:

• Had gestational diabetes during a previous pregnancy
• Previously delivered a larger-than-average baby
• Has prediabetes or elevated glucose before pregnancy
• Has a close family history of type 2 diabetes
• Has overweight or obesity before pregnancy
• Has polycystic ovary syndrome
• Has certain metabolic or hormonal conditions
• Is older at the time of pregnancy
• Has had an unexplained pregnancy loss or stillbirth
• Uses certain medicines that affect glucose metabolism
• Belongs to a population with a higher statistical prevalence of type 2 diabetes

Risk should always be interpreted respectfully and individually. Biological, social, environmental, economic, and healthcare-access factors can all influence the development and diagnosis of diabetes.

General recommendations concerning pregnancy weight should not be used to assign blame. See our guide to healthy pregnancy weight gain according to pre-pregnancy BMI .

Does Gestational Diabetes Cause Symptoms?

Gestational diabetes usually causes no noticeable symptoms. This is why blood testing is necessary even when a pregnant person feels well.

When symptoms occur, they may include:

• Increased thirst
• Urinating more frequently than expected
• Unusual fatigue
• Blurred vision
• Recurrent infections
• Glucose detected in the urine

These symptoms are not specific to diabetes. Fatigue and frequent urination, for example, are common during pregnancy for many other reasons.

A person cannot confirm or exclude gestational diabetes based on symptoms, urine appearance, food cravings, fetal size, or a home glucose meter alone.

When Is Screening for Gestational Diabetes Performed?

Routine screening is commonly performed between 24 and 28 weeks of pregnancy because insulin resistance often becomes more pronounced during this period.

People with significant risk factors may be tested earlier. When early testing is normal, screening may be repeated later in pregnancy.

Healthcare systems use different screening protocols. Some use a two-step process, while others use a single oral glucose-tolerance test.

How Is Gestational Diabetes Diagnosed?

Diagnosis is made with laboratory blood tests. A personal glucose meter is used for monitoring after diagnosis but does not replace diagnostic testing.

Glucose challenge test

In a common two-step approach, the pregnant person drinks a glucose solution. A blood sample is usually collected approximately one hour later.

Fasting may not be required for this first screening test. A result above the clinic’s threshold does not always mean that gestational diabetes is confirmed. It generally indicates that a longer diagnostic test is needed.

Oral glucose-tolerance test

For a diagnostic oral glucose-tolerance test, fasting is commonly required. A fasting blood sample is taken, a glucose drink is consumed, and additional blood samples are collected over a specified number of hours.

The number of samples, amount of glucose, diagnostic thresholds, and interpretation can vary between countries and healthcare organizations.

Tips for completing the test

• Follow all fasting and eating instructions exactly.
• Tell the clinic about vomiting, illness, or medicine use.
• Remain at the testing location as instructed.
• Avoid unnecessary physical activity during the test.
• Tell staff promptly if you feel faint, nauseated, or unwell.
• Ask when and how the results will be communicated.

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How Can Gestational Diabetes Affect Pregnancy?

Gestational diabetes does not mean that complications will definitely occur. Controlling blood glucose and receiving appropriate prenatal care can reduce risk.

Possible maternal and pregnancy concerns include:

• High blood pressure during pregnancy
• Preeclampsia
• Excessive amniotic fluid
• A baby growing larger than expected
• A more difficult vaginal delivery
• Shoulder dystocia during birth
• Induction of labor
• Cesarean birth
• Gestational diabetes in a future pregnancy
• A higher future risk of type 2 diabetes

Risks vary according to glucose control, fetal growth, maternal health, treatment, gestational age, and other pregnancy factors.

How Can Gestational Diabetes Affect the Baby?

Glucose crosses the placenta, but insulin does not cross in the same way. When maternal glucose is elevated, the fetus may produce additional insulin.

This increased fetal insulin can promote additional growth and influence glucose regulation after delivery.

Possible neonatal concerns include:

• Growing larger than expected for gestational age
• Birth injury during a difficult delivery
• Low blood glucose after birth
• Breathing difficulties
• Jaundice
• Admission to a neonatal-care unit
• A higher future risk of obesity or type 2 diabetes

These outcomes are possibilities rather than certainties. Many babies born after a pregnancy affected by gestational diabetes are healthy.

Learn how fetal growth changes across pregnancy in our fetal development week-by-week guide .

How Is Gestational Diabetes Managed?

The management plan is designed to maintain glucose within individualized target levels while supplying enough energy and nutrients for pregnancy.

Care may involve:

• Education about gestational diabetes
• A personalized eating plan
• Regular meals and snacks
• Pregnancy-appropriate physical activity
• Home blood-glucose monitoring
• Medication when needed
• Monitoring maternal blood pressure
• Assessment of fetal growth and well-being
• Planning for labor, delivery, and newborn care
• Postpartum glucose testing

The care team may include an obstetric professional, midwife, diabetes specialist, registered dietitian, diabetes educator, nurse, endocrinologist, pharmacist, and pediatric or neonatal team.

What Should You Eat With Gestational Diabetes?

There is no single gestational-diabetes diet that is appropriate for everyone. Food recommendations depend on glucose results, appetite, pregnancy weight, cultural preferences, food access, nausea, activity, medication, and fetal growth.

The objective is not to eliminate all carbohydrates. Carbohydrate-containing foods supply energy, fiber, vitamins, minerals, and other nutrients.

Instead, management generally focuses on carbohydrate quantity, quality, timing, and combination with protein, fiber, and healthy fats.

Choose higher-fiber carbohydrates

Examples may include:

• Whole-grain bread
• Oats
• Brown rice
• Quinoa
• Beans and lentils
• Chickpeas
• Whole fruits
• Vegetables
• Unsweetened dairy products

Portion size still matters. Even nutritious carbohydrate foods can raise glucose when consumed in quantities greater than the body can currently manage.

Include protein with meals and snacks

Protein sources include:

• Eggs
• Well-cooked poultry
• Lean meat
• Low-mercury fish
• Pasteurized yogurt and cheese
• Tofu and tempeh
• Beans and lentils
• Nuts and seeds

Combining carbohydrate with protein or healthy fat may help make meals more satisfying and may reduce rapid glucose changes for some people.

Limit rapidly absorbed sugars

Foods and drinks that may cause rapid glucose increases include:

• Sugary soft drinks
• Sweetened juice drinks
• Energy drinks
• Sweetened tea or coffee
• Candy
• Large portions of desserts
• Syrups and sweet sauces
• Highly refined breakfast products

This does not mean that a person must follow a completely sugar-free diet. A dietitian can help incorporate preferred foods safely and realistically.

Eat regularly

Skipping meals can make it difficult to meet nutritional needs and may contribute to unpredictable glucose patterns.

Many plans use three moderate meals and one or more snacks, but the correct schedule depends on glucose results, medication, appetite, nausea, and daily routine.

Practical Meal-Planning Ideas

These examples are general and are not individualized carbohydrate prescriptions.

Breakfast ideas

• Well-cooked eggs with whole-grain toast and vegetables
• Unsweetened Greek yogurt with berries, nuts, and seeds
• Oatmeal with nut butter and a small portion of fruit
• Tofu scramble with vegetables and whole-grain bread

Lunch ideas

• Chicken or tofu salad with beans and whole grains
• Lentil soup with vegetables and whole-grain bread
• A chickpea and vegetable wrap with pasteurized cheese
• Tuna or salmon salad using pregnancy-safe low-mercury fish

Dinner ideas

• Baked salmon with vegetables and a moderate portion of brown rice
• Lean meat or tofu stir-fry with vegetables and whole grains
• Bean and vegetable stew with quinoa
• Well-cooked chicken with roasted vegetables and sweet potato

Snack ideas

• Apple slices with peanut or seed butter
• Pasteurized cheese with whole-grain crackers
• Unsweetened yogurt with nuts
• Vegetable sticks with hummus
• A well-cooked egg with a small piece of fruit

Blood-glucose responses differ between individuals. A food that fits one person’s plan may require a different portion, timing, or combination for another person.

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Physical Activity With Gestational Diabetes

Pregnancy-appropriate movement can help the muscles use glucose and may improve glucose control.

Suitable activities may include:

• Walking
• Swimming
• Prenatal exercise classes
• Stationary cycling
• Pregnancy-appropriate strength exercises
• Gentle movement after meals

The correct type and amount depend on previous activity, pregnancy complications, balance, pain, glucose treatment, and the advice of the maternity team.

Stop exercising and obtain medical advice for vaginal bleeding, fluid leakage, painful contractions, dizziness, fainting, chest pain, severe breathing difficulty, calf pain, or reduced fetal movement.

People using insulin or another glucose-lowering medicine should receive guidance about exercise, meals, glucose checks, and symptoms of low blood glucose.

Monitoring Blood Glucose at Home

Many people with gestational diabetes use a glucose meter to check a small drop of blood from a fingertip.

The healthcare team determines when testing is required. Common times include:

• Before breakfast after an overnight fast
• One or two hours after starting a meal
• Before or after selected activities
• When symptoms of high or low glucose occur

Target ranges differ according to the clinic, test timing, individual circumstances, and treatment plan. Use the exact targets provided by your healthcare team.

Meter-use tips

• Wash and dry the hands before testing.
• Use strips that match the meter.
• Check the expiration date.
• Use a new lancet as directed.
• Record the result, time, meal, activity, and medication.
• Bring the meter and records to appointments.
• Ask the care team to compare the meter with laboratory results when appropriate.

One result outside the target does not necessarily indicate an emergency. Repeated patterns are generally more informative, but very high or very low readings require the action specified in the treatment plan.

When Is Insulin or Other Medication Needed?

Some people maintain recommended glucose levels through nutrition and physical activity alone. Others require medication despite following their plan carefully.

Needing medication does not mean that the person has failed. Placental hormones and individual insulin production can make medication necessary.

Insulin is commonly used during pregnancy because it allows precise glucose management. Some healthcare systems may also use selected oral medicines in particular circumstances.

Medication choice depends on:

• Glucose patterns
• Gestational age
• Maternal health
• Fetal growth
• Other medicines
• Access and personal circumstances
• Local clinical guidance

Take medication exactly as prescribed. Do not reduce or stop it because a single reading is lower than usual without following the care plan.

Possible signs of low blood glucose

• Shaking or trembling
• Sweating
• Sudden hunger
• Dizziness
• Weakness
• Headache
• Confusion or difficulty concentrating
• A rapid heartbeat

Anyone using glucose-lowering treatment should receive specific instructions about recognizing and treating low glucose and knowing when emergency care is required.

How Is the Pregnancy Monitored?

Prenatal monitoring depends on glucose control, medication use, fetal growth, blood pressure, gestational age, and other health factors.

Care may include:

• More frequent prenatal visits
• Reviewing home glucose records
• Blood-pressure monitoring
• Urine or blood testing when indicated
• Fundal-height measurements
• Ultrasound assessment of fetal growth
• Evaluation of amniotic-fluid volume
• Fetal movement monitoring
• Nonstress testing or other fetal surveillance when indicated

Not every person with gestational diabetes requires the same number of scans or tests. Monitoring should be based on individual clinical need.

Contact the maternity team promptly when fetal movement becomes noticeably reduced or differs significantly from the baby’s usual pattern.

Labor and Delivery With Gestational Diabetes

Gestational diabetes does not automatically require a cesarean birth. The delivery plan considers:

• Glucose control
• Estimated fetal size
• Fetal position
• Maternal blood pressure
• Medication requirements
• Previous births
• Cervical readiness
• Other pregnancy complications

Some people may be offered induction of labor. Timing is individualized and should be discussed with the maternity professional.

Blood glucose may be monitored during labor. Insulin, intravenous fluids, food, and drink instructions depend on the treatment plan and hospital policy.

After birth, the newborn’s glucose may be checked because maternal diabetes can increase the risk of low neonatal blood glucose.

Learn how to recognize contractions, rupture of the membranes, and urgent symptoms in our guide to signs of labor and when to contact the maternity unit .

What Happens After the Baby Is Born?

Insulin resistance usually decreases after delivery because the placenta is no longer producing pregnancy hormones. Many people no longer need glucose medication after birth.

Glucose may still be checked during the first days. Do not stop insulin or another prescribed medicine unless instructed.

The baby may receive additional observation for:

• Low blood glucose
• Feeding effectiveness
• Breathing
• Temperature
• Jaundice

Early and frequent feeding may help maintain the baby’s glucose. Some babies need supplementary feeding or neonatal treatment according to their blood-glucose results and clinical condition.

See our newborn care guide for information about feeding, diapers, safe sleep, jaundice, cord care, and urgent symptoms.

Long-Term Health After Gestational Diabetes

Gestational diabetes usually resolves after pregnancy, but it increases the likelihood of developing type 2 diabetes in the future.

Postpartum glucose testing is therefore important even when home readings returned to normal and the person feels well.

A glucose test is generally recommended within the first weeks after birth, commonly no later than 12 weeks. Continued diabetes screening is then needed at regular intervals.

Long-term risk reduction may involve:

• Attending postpartum glucose testing
• Informing the primary-care professional about the history of gestational diabetes
• Maintaining regular physical activity
• Following a balanced, sustainable eating pattern
• Monitoring blood pressure and cholesterol when appropriate
• Planning future pregnancies with medical support
• Receiving early glucose testing in future pregnancies

Postpartum recovery involves more than glucose testing. Read our postpartum recovery guide for information about bleeding, wound healing, emotional health, feeding, sleep, and maternal warning signs.

When Should You Seek Medical Care?

Follow the glucose and emergency instructions provided by the maternity or diabetes team.

Severe headache, visual changes, sudden swelling, upper-abdominal pain, breathing difficulty, or feeling extremely unwell may indicate a high-blood-pressure complication and requires prompt maternity assessment.

Gestational Diabetes at a Glance

Frequently Asked Questions

What is gestational diabetes?

Gestational diabetes is elevated blood glucose first diagnosed during pregnancy in someone who did not already have a known diagnosis of diabetes.

What causes gestational diabetes?

Pregnancy hormones increase insulin resistance. Gestational diabetes develops when the pancreas cannot produce enough additional insulin to maintain glucose within the recommended range.

Does eating too much sugar cause gestational diabetes?

No single food causes gestational diabetes. The condition results from pregnancy-related insulin resistance combined with individual metabolic and genetic factors. Food choices can influence glucose after diagnosis but should not be used to assign blame.

When is the gestational-diabetes test performed?

Screening is commonly performed between 24 and 28 weeks. People with important risk factors may be tested earlier and may be retested later if the early result is normal.

Can gestational diabetes be managed without insulin?

Many people maintain their glucose targets through an individualized eating plan and physical activity. Others need insulin or another prescribed medicine because pregnancy hormones produce greater insulin resistance.

Can I eat carbohydrates with gestational diabetes?

Yes. Carbohydrates provide important energy and nutrients. Management generally involves selecting appropriate types and portions, distributing them through the day, and combining them with protein, fiber, and healthy fats.

Will gestational diabetes harm my baby?

Gestational diabetes can increase certain risks, but complications are not inevitable. Glucose management and appropriate prenatal monitoring help support a healthy pregnancy and newborn.

Does gestational diabetes require a cesarean birth?

No. Delivery planning depends on glucose control, estimated fetal size, fetal position, maternal health, previous birth history, and other clinical factors.

Does gestational diabetes disappear after delivery?

Glucose commonly improves after the placenta is delivered, but postpartum testing is necessary to confirm that diabetes has resolved. Future type 2 diabetes screening remains important.

Final Thoughts

Gestational diabetes is a common and manageable pregnancy condition. It usually causes no symptoms, which makes routine screening and prenatal follow-up especially important.

Management is based on adequate nutrition, appropriate carbohydrate distribution, regular movement when safe, glucose monitoring, and medication when required. Treatment should support fetal development without promoting restrictive eating or shame.

After delivery, complete postpartum glucose testing and continue regular diabetes screening. A history of gestational diabetes remains relevant to future pregnancies and long-term metabolic health.

Continue Reading

Explore these related pregnancy, postpartum, and newborn guides:

• Pregnancy Nutrition Guide: Essential Nutrients for Mother and Baby
• Healthy Weight Gain During Pregnancy: Recommendations by BMI
• Fetal Development Week by Week: Pregnancy Milestones Explained
• Common Pregnancy Discomforts: Relief Tips and Warning Signs
• Signs of Labor: True Labor, False Labor, and When to Seek Care
• Postpartum Recovery Guide: What to Expect After Giving Birth
• Newborn Care Guide: Feeding, Sleep, Diapers, Bathing, and Warning Signs
• Breastfeeding Guide for New Mothers: Latch, Milk Supply, and Common Problems
• Early Signs of Pregnancy: Symptoms, Testing, and When to Seek Care

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