Gestational diabetes is managed through a combination of dietary changes, regular physical activity, blood sugar monitoring, and sometimes medication. Most people can keep their blood sugar in a safe range with food and exercise alone, but about 15 to 30 percent will need insulin or oral medication to hit their targets. The good news: with consistent management, the vast majority of pregnancies affected by gestational diabetes result in healthy deliveries.
Blood Sugar Targets to Aim For
The first thing your care team will do is give you specific blood sugar numbers to stay under. The American Diabetes Association’s current targets for gestational diabetes are:
- Fasting (before breakfast): below 95 mg/dL
- One hour after a meal: below 140 mg/dL
- Two hours after a meal: below 120 mg/dL
You’ll check your blood sugar several times a day, typically first thing in the morning and after each meal, using a finger-stick glucose meter or a continuous glucose monitor. Keeping a log of your readings helps your provider spot patterns. If a particular meal consistently pushes your numbers over the target, that’s a signal to adjust what or how much you’re eating at that time of day.
How to Structure Your Meals
Diet is the single most powerful tool for managing gestational diabetes. The core principle is controlling the amount and type of carbohydrates at each meal, since carbs have the biggest effect on blood sugar. For most people, 30 to 45 grams of carbohydrates per meal works well, with snacks containing 15 to 30 grams. Three meals and two to three snacks spaced throughout the day keeps blood sugar more stable than eating large meals with long gaps between them.
Not all carbohydrates behave the same way in your body. Simple carbs like white rice, white bread, potatoes, candy, soda, and fruit juice cause a fast, steep blood sugar spike. Complex carbohydrates that are high in fiber release sugar more slowly and are much easier to manage. Good choices include whole grain bread and crackers, oats, barley, brown or wild rice, whole wheat pasta, beans, and starchy vegetables like corn and peas.
Pairing carbohydrates with protein and healthy fat slows digestion further, which blunts the post-meal spike. So instead of eating a piece of fruit by itself, have it with a handful of nuts or a slice of cheese. Instead of plain oatmeal, add eggs on the side. This pairing strategy matters more than people realize, and it’s often the difference between a reading of 125 and one of 155.
Breakfast Deserves Extra Attention
Mornings tend to be the hardest time to control blood sugar during pregnancy. Hormones that rise overnight (sometimes called the dawn phenomenon) make your body more resistant to insulin in the early hours. This means the same bowl of cereal that barely moves your numbers at lunch could send your fasting or post-breakfast readings over the target. Many people find they need to keep breakfast lower in carbs and higher in protein. Think eggs with a slice of whole grain toast rather than a large bowl of granola.
The Bedtime Snack
A small snack before bed can help keep your fasting blood sugar from going too high the next morning. The snack shortens the gap between your last meal and breakfast, which gives your liver less time to dump stored sugar overnight. Aim for one to two servings of protein with 15 to 30 grams of carbohydrate. A good example is a small apple with peanut butter or a few whole grain crackers with cheese. If your fasting numbers are still running high despite this, your provider may adjust your snack composition or consider nighttime medication.
Exercise and Physical Activity
Regular movement lowers blood sugar by helping your muscles pull glucose out of your bloodstream without needing as much insulin. The general recommendation during pregnancy is at least 150 minutes of moderate-intensity aerobic activity per week, which works out to about 30 minutes on most days. Walking after meals is one of the simplest and most effective strategies. Even a 10 to 15 minute walk after dinner can noticeably lower your one-hour post-meal reading.
Safe options include brisk walking, swimming, stationary cycling, and prenatal yoga. Strength training is also beneficial as long as you avoid heavy lifting or exercises that involve lying flat on your back after the first trimester. Beyond blood sugar control, regular exercise during pregnancy is linked to a lower rate of cesarean delivery and fewer hypertensive complications.
When Medication Becomes Necessary
If your blood sugar readings consistently exceed the targets despite careful eating and regular exercise, your provider will recommend medication. This isn’t a failure. Gestational diabetes is driven largely by placental hormones that increase insulin resistance, and as the placenta grows in the third trimester, insulin resistance intensifies regardless of what you eat.
Insulin is the preferred treatment because it doesn’t cross the placenta, meaning it has no direct effect on the baby. It’s given as an injection, and your provider will teach you how to dose and administer it. Some people need insulin only at night to manage fasting numbers, while others need it before meals as well. Oral medications are sometimes used as alternatives, though they do cross the placenta and are generally considered a second-line option.
If you’re started on insulin, your blood sugar targets stay the same: fasting between 70 and 95 mg/dL, one-hour post-meal between 110 and 140, and two-hour post-meal between 100 and 120. Your doses will likely be adjusted several times as your pregnancy progresses and insulin resistance changes.
What Happens Around Delivery
Gestational diabetes affects the timing and planning of delivery. If your blood sugar is well controlled with diet and exercise alone, your provider will typically plan for delivery at or near your due date. If you’re on medication, delivery is generally recommended during the 39th week. For people with poorly controlled glucose levels, earlier delivery may be considered to reduce the risk of complications like the baby growing too large or developing low blood sugar after birth.
During labor and delivery, your blood sugar will be monitored closely. If you’ve been on insulin, you’ll likely stop needing it almost immediately after the placenta is delivered, since the hormones driving insulin resistance drop sharply at that point.
After the Baby Arrives
For most people, blood sugar returns to normal within hours of delivery. But having gestational diabetes means your risk of developing type 2 diabetes later in life is significantly higher. Current guidelines recommend a two-hour oral glucose tolerance test at 6 to 12 weeks postpartum to confirm that your blood sugar has fully normalized. This test is more sensitive than a simple fasting blood sugar check and can catch impaired glucose tolerance that might otherwise go undetected.
After that initial test, ongoing screening every one to three years is standard. The lifestyle habits that helped during pregnancy, particularly staying active, choosing complex carbohydrates, and maintaining a healthy weight, remain the most effective way to reduce your long-term risk. Breastfeeding also helps improve insulin sensitivity in the months after delivery and is encouraged for as long as it works for you and your baby.