How to Reduce the Risk of Gestational Diabetes in Your Second Pregnancy?

Name: How to Reduce the Risk of Gestational Diabetes in Your Second Pregnancy?
Creator: Dr. Albana Greca

Written by: Dr. Albana Greca, MD, MMedSc, Family Physician

Medically reviewed by: Dr. Ruden Cakoni, MD, Endocrinologist

Last medically reviewed: July 2026

Quick Answer

You cannot guarantee that gestational diabetes will not return, but you can improve your chances of a healthy second pregnancy. Before conception, ask to be tested for prediabetes or type 2 diabetes, review your medicines, and work toward a sustainable weight if weight loss is appropriate for you. Choose balanced meals and regular activity rather than a crash diet.

As soon as you become pregnant, tell your maternity team that you had gestational diabetes before. Current guidance supports early glucose assessment for people with this history. If early testing is normal, screening is generally repeated at 24–28 weeks, because insulin resistance usually increases later in pregnancy. The exact test differs by country and clinic.

Once pregnant, do not try to lose weight, severely restrict carbohydrates, or create your own testing schedule. Follow an individualized plan for healthy pregnancy weight gain, activity, nutrition, and glucose testing.

When a patient who had gestational diabetes asks me about a second pregnancy, I first explain that recurrence is common but not certain. Healthy habits matter, yet placental hormones, age, genetics, and the severity of the previous pregnancy also matter. A repeat diagnosis is not evidence that a mother failed.

How Likely Is Gestational Diabetes to Return?

A 2025 systematic review and meta-analysis of 30 studies estimated that gestational diabetes returned in about 51% of later pregnancies. The rate varied widely—from about 31% to 74%—because populations, diagnostic criteria, and risk profiles differed. This is useful for understanding that recurrence is common, but it cannot predict what will happen to one person.

Factors associated with a higher chance of recurrence include a higher pre-pregnancy BMI, weight gain between pregnancies, age, family history of type 2 diabetes, a previous large baby, higher glucose values in the earlier pregnancy, and needing insulin during the earlier pregnancy. Some factors can be modified; others cannot.

Factors you may be able to influence

Weight before pregnancy, weight change between pregnancies, food pattern, physical activity, smoking, sleep, and attendance at preconception and prenatal care.

Factors you cannot change

Your age, genes, family history, ancestry, previous glucose pattern, and the way pregnancy hormones affect insulin sensitivity.

Risk is not destiny. A risk factor identifies a group that needs earlier care; it does not tell us that an individual caused the condition. Advice to become pregnant before age 30 is not a reliable prevention strategy and may not be practical or medically appropriate.

What to Do Before Your Second Pregnancy

Arrange a preconception visit. Tell your family doctor, obstetrician, or diabetes clinician about your previous gestational diabetes and any pregnancy complications.
Ask for diabetes screening. The ADA recommends testing people with a history of gestational diabetes for prediabetes or type 2 diabetes before conception. If diabetes is found, glucose should be managed before pregnancy.
Review medicines and supplements. Some medicines used for diabetes, weight loss, blood pressure, cholesterol, or other conditions may need to be changed before pregnancy. Do not stop prescribed treatment on your own.
Work toward a sustainable weight if appropriate. If you have overweight or obesity, gradual weight loss before conception may reduce risk for some people and brings other health benefits. The evidence cannot promise prevention, and extreme diets are not advised.
Build repeatable habits. Choose balanced meals, regular movement, adequate sleep, and tobacco-free living. These habits are safer and more sustainable than a short-term “gestational diabetes cleanse.”
Plan routine pregnancy care. Review folic acid, vaccines, blood pressure, and other health needs with your clinician. These support pregnancy health even though they are not specific cures for gestational diabetes.

If you are already pregnant

Do not delay prenatal care while trying to lose weight or “fix” your glucose first. Contact your maternity team now, mention the previous gestational diabetes, and ask what early testing they recommend.

What to Do During the Second Pregnancy

Book prenatal care early and give your team the details of your previous pregnancy: when gestational diabetes was diagnosed, your OGTT results if available, whether you used insulin or another medicine, your baby’s birth weight, and whether you had high blood pressure or another complication.

The goal during pregnancy is healthy nourishment and appropriate weight gain—not weight loss. Ask for a pregnancy weight-gain range based on your pre-pregnancy BMI, whether you are carrying one baby or twins, and your individual health.

Gestational diabetes usually causes no symptoms. Feeling well does not replace testing, and thirst or frequent urination can overlap with normal pregnancy changes. Our guide to gestational diabetes symptoms and testing explains why screening is so important.

When Should Glucose Be Tested?

There is no universal “test every two weeks” schedule for preventing gestational diabetes. Home finger-stick monitoring and formal diagnostic testing answer different questions. The maternity team chooses the method according to local guidance, the previous pregnancy, and early results.

Time	What current guidance supports	What to remember
Before conception	ADA: screen for prediabetes or type 2 diabetes.	Finding diabetes before pregnancy allows safer preconception treatment.
First prenatal visit / before 15 weeks	ADA: test people with risk factors for undiagnosed diabetes and abnormal glucose metabolism. NICE: after previous GDM, offer early self-monitoring or a 75-g 2-hour OGTT as soon as possible after booking.	Early high glucose may represent previously unrecognized type 1 or type 2 diabetes rather than ordinary GDM.
24–28 weeks	Repeat GDM screening if diabetes or high-risk abnormal glucose metabolism was not already identified. NICE also advises another 75-g OGTT after a normal early OGTT in someone with previous GDM.	A normal early result does not rule out GDM later, when placental insulin resistance is stronger.
If GDM is diagnosed	Use the home-monitoring schedule and pregnancy-specific glucose targets given by the maternity or diabetes team.	A home meter monitors treatment but does not replace the clinic’s diagnostic pathway.
4–12 weeks after delivery	ADA: a 75-g OGTT to check for prediabetes or diabetes after a GDM pregnancy, followed by lifelong screening every 1–3 years.	Postpartum testing matters even if glucose returned to normal immediately after birth.

Testing methods and diagnostic thresholds differ between the one-step and two-step approaches and between national guidelines. Do not compare a home reading with a diagnostic OGTT cutoff. The blood tests for diabetes guide explains the role of the OGTT, fasting glucose, and A1C.

Food, Activity, and Pregnancy Weight Gain

Choose balanced meals—not “low carb and low fat”

Pregnancy requires adequate energy and nutrients. There is no single diet that guarantees prevention. A practical pattern is to eat regular meals, choose plenty of non-starchy vegetables, include protein, use whole fruit rather than juice, and select suitable portions of beans, lentils, whole grains, dairy, or other carbohydrate foods. Limit sugary drinks, sweets, and large portions of refined starch.

Carbohydrates are not automatically harmful. The amount, type, meal combination, and individual glucose response all matter. Avoid fasting, detoxes, ketogenic diets, or very-low-carbohydrate plans during pregnancy unless a specialist maternity team has prescribed and is supervising a specific medical plan. A registered dietitian experienced in pregnancy can personalize portions and cultural foods. See our general guide to diabetes, carbohydrates, and glycemic index.

Stay active when it is safe

For a healthy, uncomplicated pregnancy, ACOG advises at least 150 minutes of moderate-intensity aerobic activity per week. Brisk walking, swimming, a stationary bicycle, and modified prenatal exercise may be suitable. If you are new to exercise, start gradually and ask your obstetrician what is safe for you.

Stop exercise and contact your maternity team for vaginal bleeding, fluid leakage, painful regular contractions, dizziness or faintness, chest pain, severe shortness of breath, calf pain or swelling, or reduced baby movement. Some pregnancy complications require a modified or restricted activity plan.

Healthy actions can lower risk without giving certainty. A 2025 review found too little randomized evidence to prove that pre-pregnancy diet or activity programs prevent GDM. This does not make healthy habits unimportant; it means the promise should be honest and the plan should support overall health, not blame the mother if GDM returns.

Should You Take a Supplement or Medicine to Prevent GDM?

No supplement, herbal tea, or over-the-counter product should be used as a guaranteed GDM preventive treatment. “Natural” products can affect glucose, interact with medicines, or be unsafe in pregnancy. Use only prenatal supplements recommended by your clinician.

Do not start metformin, insulin, aspirin, or any other prescription medicine solely to prevent gestational diabetes unless your own clinician has identified a clear indication. If you are already taking a glucose-lowering or weight-management medicine, arrange a medication review before conception or as soon as pregnancy is recognized.

When to Contact Your Maternity Team Urgently

Contact your maternity or diabetes team promptly for repeated glucose readings above your pregnancy target, moderate or high ketones if you have been told to check them, severe thirst, frequent urination with illness, unexplained weight loss, vomiting, dehydration, or inability to keep food and fluids down.

Seek emergency care for confusion, severe weakness, difficult or rapid breathing, fainting, severe abdominal pain, heavy bleeding, fluid leakage, painful regular contractions, severe headache with vision changes, or reduced baby movement. Follow your local maternity emergency instructions.

Doctor’s Note

I encourage patients to focus on preparation rather than perfection. Test for diabetes before pregnancy when possible, bring the previous pregnancy records to the first prenatal visit, and complete both early and later screening when advised. Eat enough nutritious food, stay active safely, and ask for help early. If gestational diabetes returns, prompt treatment protects both mother and baby; it does not mean that your efforts failed.

Frequently Asked Questions

Can I completely prevent gestational diabetes in my second pregnancy?

No. Healthy weight, nutrition, activity, and early care may reduce risk, but they cannot eliminate the effects of pregnancy hormones, genetics, age, or previous metabolic risk. The goal is to lower modifiable risk and detect high glucose early.

What is the recurrence rate after one pregnancy with GDM?

A 2025 meta-analysis estimated recurrence at about 51%, but individual studies ranged from about 31% to 74%. Your personal chance depends on your health, previous glucose results, treatment needed, weight, age, family history, and the diagnostic criteria used.

When should I be tested in a second pregnancy?

Tell your clinician at the first prenatal visit. ADA guidance supports testing people with risk factors before 15 weeks if they were not screened before conception. If early testing is normal, GDM screening is generally repeated at 24–28 weeks. NICE offers an early OGTT or self-monitoring after previous GDM, then another OGTT at 24–28 weeks if the early OGTT is normal.

Should I check my blood sugar every two weeks?

Not as a universal rule. Your team may recommend early home monitoring, an OGTT, or another structured plan. Checking occasionally every two weeks can miss fasting or after-meal patterns and does not replace diagnostic testing. Follow the schedule and pregnancy-specific targets provided by your maternity team.

Should I follow a low-carbohydrate diet while pregnant?

Do not severely restrict carbohydrates or follow a crash, detox, or ketogenic diet on your own. Pregnancy nutrition should provide adequate energy, fiber, vitamins, minerals, and suitable carbohydrate portions. A maternity dietitian can personalize the plan if your glucose is high.

Is running required to lower my risk?

No. Running is not required and may not suit every pregnancy. For many people with an uncomplicated pregnancy, moderate activity such as brisk walking, swimming, or a stationary bicycle is appropriate. Ask your obstetric clinician, begin gradually, and follow pregnancy exercise warning signs.

Related Resources

References

American Diabetes Association: Management of Diabetes in Pregnancy—Standards of Care in Diabetes 2026.
American Diabetes Association: Diagnosis and Classification of Diabetes—Standards of Care in Diabetes 2026.
NICE: Diabetes in Pregnancy—Recommendations. NG3.
Li W, et al. Gestational Diabetes Mellitus Recurrence Rate and Risk Factors: A Systematic Review and Meta-analysis. Diabetes Research and Clinical Practice. 2025;229:112949.
Poprzeczny A, et al. Pre-Pregnancy Diet and/or Physical Activity Interventions for the Prevention of Gestational Diabetes Mellitus: A Systematic Review and Meta-Analysis. Australian and New Zealand Journal of Obstetrics and Gynaecology. 2025.
American College of Obstetricians and Gynecologists: Exercise During Pregnancy.
Centers for Disease Control and Prevention: Gestational Diabetes.