Gestational Diabetes diet & treatment strategies

by Manju Jora
(Canada )






Quick Answer
A failed 75-g glucose tolerance test can confirm gestational diabetes, even if you were not overweight before pregnancy and have never had gestational diabetes before. At 35 weeks, the priorities are to follow your glucose-monitoring plan, eat enough nutritious food for pregnancy while spreading carbohydrate through the day, remain active if your obstetric team says it is safe, and review your readings with your maternity or diabetes team. Medication, usually insulin when needed, may be added if lifestyle measures do not keep glucose within pregnancy targets.



QUESTION

I am 35 weeks pregnant. At 32 weeks my doctor recommended a 75-g glucose test, and I failed the 2-hour result.


I am 33 years old and was not overweight before pregnancy. I weighed about 62 kg before pregnancy and now weigh about 68 kg. I usually cook at home and only occasionally eat sweets.


I have never had gestational diabetes before. I have stopped sweet foods and changed my diet. What should I do for myself and my baby?




Answer by Dr. Albana Greca Sejdini, MD, MMedSc, Family Physician, IDF Fellow



Hello Manju,



The first thing I want you to know is that gestational diabetes can happen even when you were not overweight before pregnancy, usually eat well, and have never had it before. Pregnancy hormones can make it harder for insulin to keep glucose in range, especially later in pregnancy.



What Does a Failed 75-g Glucose Test Mean?



For the one-step 75-g oral glucose tolerance test, gestational diabetes is diagnosed when any of these laboratory values are met or exceeded: fasting 92 mg/dL (5.1 mmol/L), 1 hour 180 mg/dL (10.0 mmol/L), or 2 hours 153 mg/dL (8.5 mmol/L).



You mentioned that your 2-hour result was high, but not the actual number. Without that number I cannot tell you how far above the diagnostic threshold it was.



Our gestational diabetes testing guide explains the test and diagnostic ranges in more detail.



What Should You Eat?



Please do not severely restrict food or carbohydrates during pregnancy. Your baby still needs adequate nutrition. The goal is not a “no-carb” diet, but an individualized eating plan that helps control glucose while meeting pregnancy needs.



Try to spread carbohydrate through the day rather than eating a large amount at one meal. Choose more nutrient-dense sources such as whole grains, beans, lentils, vegetables, dairy and whole fruit, and combine them with protein and healthy fats.



You do not need to eliminate every sweet food forever, but sugary drinks, large desserts and concentrated sweets can raise glucose quickly and are best limited.




Important: Do not deliberately cut carbohydrate too low in pregnancy unless your obstetric or diabetes team has specifically advised it. Pregnancy nutrition must support both glucose control and fetal growth.


What Glucose Numbers Should You Aim For?



Common gestational diabetes

targets are fasting glucose below 95 mg/dL (5.3 mmol/L), 1-hour after meals below 140 mg/dL (7.8 mmol/L), or 2-hours after meals below 120 mg/dL (6.7 mmol/L). Your own team may individualize these targets.



Check your glucose at the times your clinician recommends and write down the readings with meals. A pattern over several days helps determine whether nutrition and activity are enough.



Should You Exercise?



If your obstetric team has not given you a reason to avoid activity, moderate exercise such as walking after meals can help improve glucose control.



At 35 weeks, choose activity that is comfortable and pregnancy-safe. Stop and contact your maternity team if you develop bleeding, painful contractions, leaking fluid, dizziness, chest pain, unusual shortness of breath or reduced fetal movement.



What If Diet and Activity Are Not Enough?



Many women control gestational diabetes with nutrition, activity and monitoring alone. If your readings remain above target, medication may be needed.



Current ADA guidance prefers insulin when medication is required for gestational diabetes because it does not cross the placenta in the same way as some oral glucose-lowering medicines.



Do not feel that needing medication means you have failed. The goal is to protect you and your baby by keeping glucose within a safer range.



Our gestational diabetes treatment guide explains lifestyle and medication options.



Why Good Control Matters for Your Baby



Keeping glucose within target helps reduce the risk of excessive fetal growth, difficult delivery and low glucose in the baby after birth.



Your prenatal team may also monitor your baby's growth and decide whether additional fetal surveillance is needed based on your glucose control and treatment.




Contact your maternity team promptly if your glucose is repeatedly above the targets they gave you, or if you have reduced fetal movement, vaginal bleeding, leaking fluid, regular painful contractions, severe headache, vision changes or persistent vomiting.


My Advice



At 35 weeks, I would not focus on losing weight or following a restrictive diet. I would focus on your glucose pattern, balanced meals, appropriate portions of carbohydrate, pregnancy-safe activity, and close follow-up with your obstetric or diabetes team.



If you have your actual fasting, 1-hour and 2-hour glucose results, those numbers can help your clinician decide how intensive your treatment needs to be.



Related Questions




Related Pages




References



  • American Diabetes Association. Standards of Care in Diabetes—2026: Diagnosis and Classification of Diabetes.

  • American Diabetes Association. Standards of Care in Diabetes—2026: Management of Diabetes in Pregnancy.




Educational only — not personal medical advice. Gestational diabetes treatment and pregnancy glucose targets should be individualized with your obstetric and diabetes care team.


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