Gestational Diabetes: Understanding Causes, Diagnosis & Treatment Options

Understanding Gestational Diabetes

Gestational diabetes happens when your body isn’t able to make enough insulin during pregnancy. Insulin is a hormone that helps move sugar (glucose) from your blood into your cells to be used for energy. But during pregnancy, your body goes through a lot of hormonal changes, and some of these can make insulin less effective.

As a result, sugar builds up in your blood — and that’s when pregnancy diabetes can occur. The good news is, it usually goes away after childbirth. However, it does increase your chances of developing type 2 diabetes later in life, so keeping an eye on your health even after delivery is important.

Symptoms of Gestational Diabetes

Most women don’t experience obvious gestational diabetes symptoms, which is why screening is important. In some cases, symptoms may include:

• Feeling unusually thirsty or needing to urinate more often
• Feeling more tired than usual
• Blurry vision from time to time
• Nausea or feeling off
• Sugar showing up in a routine urine test (your doctor may catch this during a prenatal check-up)

Causes of Gestational Diabetes

The exact gestational diabetes causes aren’t fully understood, but several factors contribute to the condition:

• Hormonal Changes: The placenta produces hormones that can block insulin.
• Insulin Resistance: As pregnancy progresses, insulin becomes less effective.
• Risk Factors: Being overweight, older than 25, or having a family history of diabetes increases your chances.
• Previous Pregnancy: Having had gestational diabetes before or delivering a baby over 4 kg raises the risk.

Diagnosis of Gestational Diabetes

Screening usually takes place between the 24th and 28th week of pregnancy. The most common gestational diabetes diagnosis methods are:

• Glucose Challenge Test (GCT): You’ll be asked to drink a sweet liquid. About an hour later, your blood sugar is checked. If the reading is higher than normal, it doesn’t mean you definitely have gestational diabetes — but it means more testing is needed.
• Oral Glucose Tolerance Test (OGTT): This is a follow-up test done after fasting. You’ll drink a sugary drink again, and your blood will be tested at several points over the next few hours to see how your body handles the sugar. This test gives a clearer picture of how your body processes glucose.

Gestational Diabetes Blood Sugar Levels

Keeping your blood sugar in check is crucial. Here are the commonly accepted target gestational diabetes blood sugar levels:

• Fasting: ≤ 95 mg/dL (5.3 mmol/L)
• 1 hour after meals: ≤ 140 mg/dL (7.8 mmol/L)
• 2 hours after meals: ≤ 120 mg/dL (6.7 mmol/L)

Treatment Options for Gestational Diabetes

The goal of gestational diabetes treatment is to keep blood sugar within target ranges to prevent complications.

1. Healthy Eating Habits

Focus on balanced meals with whole grains, fibre-rich foods, lean proteins, and plenty of fruits and vegetables. Cutting back on refined sugars and simple carbs helps prevent spikes in blood sugar.

2. Staying Active

Regular physical activity — even a 30-minute walk most days — helps your body use insulin better. Exercises like walking, swimming, and prenatal yoga are generally safe and effective during pregnancy.

3. Monitoring Blood Sugar

You’ll likely need to check your blood sugar several times a day. This helps you and your doctor know whether your current plan is working — and adjust it if needed.

4. Medication (If Needed)

If diet and exercise aren’t enough to keep your levels stable, your doctor may prescribe insulin or oral medications like metformin. These are safe during pregnancy and help avoid complications.

Prevention and Lifestyle Tips

While not all cases of gestational diabetes can be prevented, you can reduce your risk by:

• Maintain a healthy weight: before getting pregnant — even modest weight loss can make a difference.
• Eat balanced meals: that are low in sugar and refined carbs, and rich in fibre, vegetables, lean proteins, and whole grains.
• Stay physically active: — regular movement like walking or swimming helps your body use insulin more efficiently.
• Gain weight mindfully during pregnancy:, following your doctor’s recommendations based on your starting BMI.

When to See a Doctor

Regular prenatal visits are essential for monitoring the health of both mother and baby. If you experience symptoms such as excessive thirst, frequent urination, or fatigue, consult your doctor promptly. Early detection and management of gestational diabetes are crucial for reducing potential risks.

For expectant mothers in Pune, seek care at Aditya Birla Memorial Hospital, a reputable Obstetrics & Gynaecology Hospital in Pimpri-Chinchwad. Here you can consult some of the best gynaecologists in Pune who will provide personalized care and effective management of gestational diabetes.

Conclusion

Gestational diabetes is a manageable condition with proper care and attention. Understanding its causes, recognizing symptoms, adhering to recommended screening protocols, and following appropriate treatment plans are vital steps to ensure a healthy pregnancy and reduce risks for both mother and child.

FAQs

What is the diagnosis for gestational diabetes?

Gestational diabetes is usually diagnosed between 24 and 28 weeks of pregnancy through a Glucose Challenge Test (GCT). If the results are elevated, it’s followed by an Oral Glucose Tolerance Test (OGTT) to confirm how your body handles sugar during pregnancy.

What are the treatment options for gestational diabetes?

Managing gestational diabetes typically involves healthy eating, staying active, and monitoring blood sugar levels. Some women may also need insulin injections or oral medication to keep blood sugar within a safe range.

What is the main cause of gestational diabetes?

During pregnancy, hormonal shifts can interfere with the way insulin works, making the body more insulin-resistant. When the pancreas can't keep up with the extra demand, blood sugar levels rise, leading to gestational diabetes.

What is a normal blood sugar level in pregnancy?

Target levels usually include:

Fasting: 95 mg/dL (5.3 mmol/L) or below

1 hour after meals: 140 mg/dL (7.8 mmol/L) or below

2 hours after meals: 120 mg/dL (6.7 mmol/L) or below

References:

• MedlinePlus. Diabetes and pregnancy [Internet]. Bethesda (MD): U.S. National Library of Medicine; [updated 2022 Jun 29; cited 2025 Mar 24]. Available from: https://medlineplus.gov/diabetesandpregnancy.html
• Brooten D, Youngblut JM. Diabetes in pregnancy [Internet]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan– [cited 2025 Mar 24]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK545196/
• Centers for Disease Control and Prevention (CDC). Gestational Diabetes [Internet]. Atlanta (GA): CDC; [updated 2022 Dec 15; cited 2025 Mar 24]. Available from: https://www.cdc.gov/diabetes/about/gestational-diabetes.html
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Gestational Diabetes: Management and Treatment [Internet]. Bethesda (MD): NIDDK; [updated 2017 Nov; cited 2025 Mar 24]. Available from: https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/gestational/management-treatment