Question:
I am 5 weeks pregnant and afraid of developing gestational diabetes. I am trying to eat healthily and stay active, although I have nausea and occasional vomiting. Is there anything I can do to prevent gestational diabetes?
You can lower your risk of gestational diabetes, but there is no guaranteed way to prevent it. Pregnancy hormones naturally make the body more resistant to insulin, so some women develop it despite eating well and staying active.
The best approach is early prenatal care, balanced meals, safe activity, appropriate weight gain, and recommended glucose screening.
Answer by Dr. Albana Greca, MD, MMedSc
Hello,
I understand why you are worried, especially if you have seen a friend struggle with gestational diabetes. But developing it does not mean a woman has done something wrong. Placental hormones can create strong insulin resistance even in women with healthy habits.
Healthy habits can reduce the risk, but they cannot completely prevent it. Risk may be higher with a family history of diabetes, previous gestational diabetes, PCOS, excess weight before pregnancy, older maternal age, or a previous large baby. Some women develop it without an obvious risk factor.
So rather than trying to control every possible cause, focus on the parts you can control: good prenatal care, sensible nutrition, regular movement, and timely screening.
Tell your obstetrician if diabetes runs in your family or if you have ever had high blood sugar, gestational diabetes, PCOS, or a large baby. Depending on your history, your doctor may decide to test you earlier in pregnancy.
Even if an early test is normal, most women are still screened later, commonly around 24–28 weeks, because insulin resistance usually becomes stronger as pregnancy progresses. You can read more about the different tests on our blood tests for diabetes page.
You do not need to remove carbohydrates from your diet. You and your baby need adequate energy and nutrition. What matters more is the type of carbohydrate, the portion, and what you eat with it.
If nausea or vomiting makes eating difficult, speak with your maternity team or a pregnancy dietitian. Our guide to carbohydrates and the glycemic index explains how different carbohydrate foods affect blood sugar.
For many uncomplicated pregnancies, moderate activity such as walking can improve insulin sensitivity and support healthy weight gain. You do not need extreme workouts. Ask your obstetrician what type and amount of exercise is appropriate for you.
Weight gain during pregnancy is normal. The right amount depends on your pre-pregnancy BMI and whether you are carrying one baby or multiples. Your obstetrician can recommend a suitable range.
Please do not try to lose weight during pregnancy unless your doctor specifically advises it. Also, do not compare your weight gain with another woman’s. Rapid weight gain alone does not diagnose gestational diabetes.
Checking your blood sugar once a week at home is not a reliable way to rule out gestational diabetes. Home meters can help when your doctor recommends monitoring, but diagnosis requires the correct test and timing.
Ask your obstetrician whether you need early testing and when your routine gestational diabetes screening will be done. This is important because gestational diabetes often causes no obvious symptoms.
At 5 weeks, nausea and occasional vomiting are very common and are not typical signs of gestational diabetes. However, repeated vomiting can lead to dehydration and make it difficult to get enough food and fluids.
Contact your prenatal team if you cannot keep fluids down, urinate very little, feel faint, lose weight, have blood in the vomit, develop severe abdominal pain, or notice signs of dehydration.
Try not to see the diagnosis as a failure. Gestational diabetes is manageable, especially when found early. Treatment may include meal planning, activity, glucose monitoring, and sometimes medication or insulin.
If insulin is needed, it simply means your body needs extra help keeping glucose in a safer range during pregnancy. It is a treatment tool, not a sign that you did something wrong.
Seek medical advice promptly for repeated vomiting, dehydration, inability to eat or drink, unexplained weight loss, severe thirst, frequent urination, blurred vision, or feeling seriously unwell. Seek urgent maternity care for bleeding, severe abdominal pain, fainting, fluid leakage, or other emergency pregnancy symptoms.
My advice is to focus less on trying to “prevent” gestational diabetes perfectly and more on supporting a healthy pregnancy. Eat regularly, stay active when it is safe, keep your prenatal appointments, and complete the recommended glucose testing. If gestational diabetes appears, finding it early gives you and your baby the best chance of keeping the pregnancy on a healthy course.
Educational safety note: This answer is for general education only and does not replace prenatal medical care. Do not begin supplements, strict diets, weight-loss plans, new exercise programs, home glucose-testing schedules, or medication changes during pregnancy without guidance from your obstetrician.
Last reviewed: July 2026.
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