Managing gestational diabetes comes down to three main levers: what you eat, how you move, and, when needed, medication. Most women diagnosed with gestational diabetes can keep their blood sugar within a safe range through diet and exercise alone. The targets you’re aiming for are a fasting blood sugar below 95 mg/dL, below 140 mg/dL one hour after eating, and below 120 mg/dL two hours after eating.
Choose Lower Glycemic Index Foods
The single most impactful change you can make is shifting the types of carbohydrates you eat. A low glycemic index (GI) diet focuses on carbs that break down slowly, keeping blood sugar from spiking after meals. That means choosing pasta, grain breads, and high-fiber unprocessed cereals over white bread, processed breakfast cereals, potatoes, and white rice.
In a clinical trial published in Diabetes Care, women with gestational diabetes who followed a low-GI diet were half as likely to need insulin compared to those eating higher-GI foods. Only 29% of the low-GI group required insulin, versus 59% in the comparison group. Even more telling: when women in the higher-GI group switched to lower-GI foods, about half of them brought their blood sugar down enough to avoid insulin entirely.
You don’t need to eliminate carbohydrates. The Institute of Medicine recommends at least 175 grams of carbohydrates per day during pregnancy, and research suggests that a range providing 47% to 70% of your total calories from carbs supports normal fetal growth. The goal isn’t fewer carbs overall but better carbs, spread across three meals and two to three snacks throughout the day rather than eaten in large amounts at once.
Pair Carbs With Fiber and Protein
Your body doesn’t break down fiber the way it breaks down other carbohydrates, so fiber doesn’t cause the same blood sugar spike. The Dietary Guidelines for Americans recommend 22 to 34 grams of fiber per day depending on age and sex. Good sources include vegetables, beans, lentils, whole grains, and berries.
Pairing carbohydrates with protein or healthy fat at every meal and snack slows digestion further. Think apple slices with peanut butter instead of apple slices alone, or cheese and whole-grain crackers instead of crackers by themselves. This pairing blunts the post-meal glucose peak, which is the number that tends to be hardest to control with gestational diabetes.
Walk After Meals
Exercise makes your muscles pull glucose out of your bloodstream more efficiently, and the timing matters. Studies on women with gestational diabetes found that moderate-intensity walking starting about 30 minutes after a meal, for roughly 20 minutes, reduced peak blood sugar levels over the following two hours. A post-meal walk is one of the simplest tools you have.
The broader recommendation is at least 150 minutes per week of moderate-intensity activity, spread across three to four days or more. Walking, stationary cycling, swimming, water aerobics, and resistance exercises using body weight or resistance bands all count. Yoga and stretching can be added as complements. The American Diabetes Association’s 2024 guidelines suggest sessions of 20 to 50 minutes, at least twice a week, combining aerobic exercise with some form of resistance training.
You don’t need to do anything extreme. A 30-minute walk after dinner, a few bodyweight squats while watching TV, or a prenatal yoga class all move the needle. The key is consistency rather than intensity.
Monitor Your Blood Sugar Regularly
Checking your blood sugar at home is how you learn which foods and habits work for your body. The standard approach is testing your fasting level each morning and then one hour after the start of each meal, giving you about four readings per day. Some providers also recommend an occasional check before bed, especially if you’re using insulin.
These numbers are your feedback loop. If a particular meal consistently sends your one-hour reading above 140 mg/dL, you know to adjust the portion size, swap in a lower-GI carb, add more protein, or take a walk afterward. Many women find that their blood sugar responds differently to different foods in ways they wouldn’t predict without testing. Rice might spike you while pasta doesn’t, or vice versa.
Stay Within Weight Gain Guidelines
Excess weight gain during pregnancy can make blood sugar harder to control. The CDC’s recommendations depend on your pre-pregnancy BMI:
- Normal weight (BMI 18.5 to 24.9): 25 to 35 pounds total
- Overweight (BMI 25.0 to 29.9): 15 to 25 pounds total
- Obese (BMI 30.0 to 39.9): 11 to 20 pounds total
These aren’t targets to hit precisely each week, but they give you a general range. If your weight gain is tracking well above these numbers, it’s worth discussing with your provider, since it often signals that dietary adjustments could help with both weight and blood sugar.
Prioritize Sleep
Sleep duration has a surprisingly direct relationship with gestational diabetes risk and blood sugar control. A prospective study found that women who slept fewer than 7 hours or more than 9 hours per night had significantly higher rates of gestational diabetes compared to those sleeping 7 to 9 hours. Both too little and too much sleep appear to reduce insulin sensitivity.
In the third trimester, getting quality sleep is easier said than done. A pillow between the knees, a consistent bedtime, and limiting fluids in the hour before bed can help. If you’re waking frequently or dealing with significant discomfort, mention it to your provider, because poor sleep may be quietly working against your blood sugar goals.
When Diet and Exercise Aren’t Enough
Some women do everything right with food and activity and still can’t hit their glucose targets. This isn’t a failure. The placenta produces hormones that block insulin, and for some women, the effect is simply too strong for lifestyle changes to fully overcome.
Insulin injections have long been the standard treatment. More recently, oral medication has become an option. A large trial published in the New England Journal of Medicine found that the oral approach produced identical outcomes for babies compared to insulin, with no increase in complications. Women in the oral medication group also gained less weight during pregnancy and reached their glucose targets sooner. Perhaps most notably, 77% of women who used the oral medication said they’d choose it again, compared to just 27% of those on insulin.
About half of the women who started on oral medication in that trial were able to manage on it alone. The other half eventually needed supplemental insulin as well. Either way, the goal is the same: keeping blood sugar in the target range to reduce the risk of a large baby, birth complications, and newborn blood sugar problems.
Putting It All Together
Gestational diabetes is typically diagnosed between 24 and 28 weeks of pregnancy, though women with risk factors may be screened earlier. That leaves roughly 10 to 16 weeks of active management before delivery, and the strategies above work best in combination. A low-GI diet paired with post-meal walks and consistent monitoring gives most women enough control to avoid medication. Adding attention to sleep and weight gain addresses the hormonal and metabolic factors that run in the background.
The condition almost always resolves after delivery, but about 20% to 23% of women still show impaired glucose tolerance at their postpartum checkup six to eight weeks later. The habits you build now, choosing whole grains over refined carbs, staying active, monitoring how your body responds to food, are worth keeping long after pregnancy ends.