The most effective ways to lower blood sugar during pregnancy involve adjusting what and when you eat, moving your body after meals, and getting enough sleep. Most people with elevated blood sugar in pregnancy can reach their targets through these lifestyle changes alone, though some will need medication. The general targets are a fasting glucose of 70 to 95 mg/dL, under 140 mg/dL one hour after eating, and under 120 mg/dL two hours after eating.
Rethink Carbohydrates, Not Just Calories
Blood sugar during pregnancy rises primarily in response to carbohydrates, so the type and timing of carbs you eat matters more than your total calorie count. Simple carbohydrates like white rice, potatoes, french fries, candy, soda, and other sweets cause blood sugar to spike quickly. Complex carbohydrates, which are higher in fiber, release glucose more gradually and produce smaller spikes.
Good swaps include brown or wild rice instead of white rice, whole-wheat pasta instead of regular, and whole-grain bread instead of white. Beans, barley, oats, and starchy vegetables like corn and peas are also solid choices. For fruits, whole fruits are better than juice because the fiber slows digestion. Citrus fruits, berries, and apples are particularly good options.
Vegetables are essentially free foods for blood sugar management. Dark green and deep yellow vegetables like spinach, broccoli, romaine lettuce, carrots, and peppers add volume and nutrients without meaningfully raising glucose. Eating them alongside carbohydrates helps blunt the post-meal spike.
Spread Your Carbs Throughout the Day
Eating roughly the same amount of carbohydrates at each meal keeps blood sugar steadier than loading up at one sitting and eating lightly at another. Many people with gestational diabetes do well eating three moderate meals plus two or three small snacks, which prevents both the spikes that follow large meals and the drops that come from going too long without food.
There’s no universal carbohydrate target that works for everyone. The right amount depends on your age, weight, activity level, and how your body responds. A dietitian or diabetes educator can help you find your specific range, but the principle is consistent: distribute your carbs evenly rather than concentrating them.
Pair Carbs With Protein and Fat
Eating carbohydrates alone produces a faster, taller blood sugar spike than eating them alongside protein or healthy fat. A piece of toast with peanut butter, for example, raises blood sugar less sharply than the same toast eaten plain. Adding cheese to crackers, nuts to fruit, or chicken to rice are all practical ways to flatten your post-meal glucose curve. This pairing strategy is one of the simplest changes you can make and often produces noticeable results on your meter within days.
Walk After Meals
A short walk after eating is one of the most frequently recommended strategies for post-meal blood sugar control. The American College of Obstetrics and Gynecology suggests a 10 to 15 minute walk after each meal to improve glucose levels. The pace should be light to moderate, not strenuous. Think of a comfortable pace where you could still hold a conversation.
Research has tested two approaches: three short 10-minute walks taken within the first hour after each meal, and a single 30-minute walk done at any other time of day. Both are reasonable options, and the best choice is whichever one you’ll actually do consistently. If you can only fit in one walk per day, aim for after your largest meal, which is typically the one that spikes your blood sugar the most.
Prioritize Sleep
Sleep duration has a direct relationship with blood sugar during pregnancy, and it’s a factor many people overlook. During the first trimester, about 28% of pregnant people report short sleep. By the third trimester, that number climbs to 40%, driven by back pain, itching, frequent urination, and general discomfort.
The consequences for blood sugar are measurable. Short sleep is associated with higher fasting glucose levels and a greater risk of gestational diabetes, even after accounting for age, weight, and other factors. In women already diagnosed with gestational diabetes, each hour of reduced sleep corresponds to roughly a 4% increase in glucose levels. Sleep affects how well your body uses insulin, and pregnancy already reduces insulin sensitivity on its own. Poor sleep compounds the problem.
Practical steps include keeping a consistent bedtime, using pillows to support your back and belly, and limiting fluids in the hour before bed to reduce nighttime bathroom trips. If snoring or gasping is disrupting your sleep, mention it to your provider, as sleep-disordered breathing becomes more common in pregnancy and further worsens glucose control.
Stay Hydrated
Chronic low fluid intake has been identified as a potential risk factor for developing diabetes, and your kidneys work harder during pregnancy, increasing your need for water. While one study of second-trimester pregnant women didn’t find that different fluid intake levels produced significant differences in blood glucose readings, adequate hydration clearly supports kidney function and overall metabolism. Dehydration during pregnancy impairs physical performance, cognitive function, and kidney excretion. Aim for water as your primary beverage, and skip sugary drinks and fruit juices, which add carbohydrates without the fiber that slows absorption.
Rethink the Bedtime Snack
You may have heard that a bedtime snack helps lower fasting blood sugar by preventing your liver from dumping glucose overnight. This advice has been common in gestational diabetes guidelines for years, but recent evidence challenges it. A randomized trial gave one group of women with gestational diabetes 25 grams of nuts before bed while the other group ate nothing. After eight weeks, there was no significant difference in fasting blood sugar or in the rate of high fasting readings between the two groups. The snack group actually had worse results for blood lipids and higher one-hour post-meal glucose.
If your fasting numbers are already in range, a bedtime snack may not help and could add unnecessary calories. If your fasting glucose runs high, talk with your care team about other strategies rather than assuming a snack will fix it. Fasting blood sugar is often the hardest number to control through lifestyle changes alone, and it may be the reading that ultimately requires medication.
When Lifestyle Changes Aren’t Enough
If diet, exercise, and sleep improvements don’t bring your numbers into range, medication is the next step. Insulin is the preferred treatment for managing blood sugar during pregnancy because it does not cross the placenta to the baby. You may have heard of oral medications like metformin being used, but the most recent guidelines from the American Diabetes Association recommend against them as a first-line treatment. Metformin crosses the placenta and reaches concentrations in the baby’s blood as high as or higher than the mother’s. Studies in primates have shown it can affect fetal kidney development, and children exposed to metformin in the womb tend to have higher BMI in childhood.
When metformin has been used, monotherapy fails in 14 to 46% of cases, meaning many people end up needing insulin anyway. If insulin is recommended, it typically involves one or more daily injections that you learn to give yourself. Your care team will adjust the dose based on your blood sugar readings over time.
Monitoring Your Numbers
Traditional blood sugar monitoring means pricking your finger several times a day, usually first thing in the morning and one to two hours after each meal. This works well for most people, but continuous glucose monitors (CGMs) are becoming more common in pregnancy. These small sensors, worn on the back of your arm or abdomen, measure glucose every one to five minutes and show you trends throughout the day and night.
Several CGM devices are approved for use in pregnancy. For gestational diabetes specifically, studies show CGM users achieve modest improvements in average blood sugar, with one meta-analysis finding an overall reduction in a key blood sugar marker. The real advantage is seeing how specific foods, activities, and sleep patterns affect your glucose in real time, which lets you fine-tune your approach faster than finger-stick testing alone.
One caveat: some CGM models can overestimate low blood sugar readings at night, which could lead you to eat unnecessary snacks or reduce medication when you don’t need to. If your CGM shows a low reading and you feel fine, confirm it with a finger stick before treating.
Recognizing and Treating Low Blood Sugar
If you’re on insulin or making significant dietary changes, blood sugar can occasionally drop too low. Symptoms include shakiness, sweating, dizziness, confusion, and sudden hunger. If your reading falls below 60 mg/dL, eat or drink 15 grams of fast-acting carbohydrate, such as three glucose tablets, half a cup of juice, or a few hard candies. Recheck after 15 minutes. If your level hasn’t risen by at least 20 points, repeat. If your reading drops below 40 mg/dL, drink a full cup of juice immediately. Keep glucose tablets or juice boxes in your bag, car, and nightstand so you’re never caught without a quick fix.