Gestational Diabetes Diet: What to Eat and Avoid During Pregnancy

If you've just found out you have gestational diabetes, you're likely doing deep dives on the internet to find out exactly how to manage it. You might feel equal parts confused and stressed — all while growing an entire human.

The good news is that gestational diabetes is one of the most manageable pregnancy complications there is, and diet is the primary tool for controlling it.

Between 5% and 9% of U.S. pregnancies are affected by gestational diabetes, and the majority of people manage it successfully through nutrition changes alone. In this article, we'll explain exactly what that looks like.

What Is Gestational Diabetes and Why Diet Matters

Pregnancy hormones can interfere with how you use insulin, the hormone that draws sugar out of your bloodstream and into your cells. Insulin resistance that can develop is more common in late pregnancy, around the 24th week. This is where the cells in your muscles, fat, and liver don't respond as well to insulin, making sugar stay in your blood.

The danger here is the effects this can have on the child and parent, including higher rates of hypertensive disorders. Infants have a risk of fetal macrosomia and respiratory distress syndrome. Fortunately, risks may be altered with lifestyle and dietary changes.

How Food Affects Your Blood Sugar During Pregnancy

What you eat has the biggest impact on your blood sugar levels. If you have a meal that's high in sugar, whether it's a bowl of oatmeal or a cookie, you get glucose (sugar) in your bloodstream. Your body needs insulin to move it out of your blood and into your cells.

However, you can get much more sugar in your bloodstream if you're eating certain types of foods, like simple carbohydrates on an empty stomach. The trick is to eat carbs that don't spike your blood sugar so much, and to pair carbs with foods that slow down blood sugar release.

What to Eat When You Have Gestational Diabetes

Fiber, protein, and healthy fats are going to become your best friends. They slow digestion overall, which is why pairing them with carbs produces a better blood sugar response than eating carbs alone.

Best Carbohydrates for Stable Blood Sugar

You don't need to cut carbs; it's just about getting more of the kinds that release blood sugar slowly. For example:

 
• Oatmeal, quinoa, brown rice, whole wheat bread and pasta, barley, sweet potato, corn, and peas
 
• A portion is about a half cup of cooked grains or vegetables, or one slice of bread per meal

Protein-Rich Foods That Help Control Blood Sugar

Like fiber, protein both blunts blood sugar spikes and keeps you fuller for longer. Types to add to your diet include:

 
• Tofu, Greek yogurt, cottage cheese, and low-fat milk
 
• Chicken, turkey, eggs
 
• Beans and lentils
 
• Nuts and seeds
 
• Fish (salmon, sardines, shrimp, tilapia — all safe in pregnancy when properly cooked)

Pregnancy guidelines limit high-mercury options like swordfish, shark, and king mackerel. Salmon and canned light tuna are fine in reasonable amounts.

Healthy Fats to Include

Brain development depends on healthy fats, so making sure you get enough is key:

 
• Avocado and olive oil
 
• Nuts and seeds
 
• Fatty fish (salmon, mackerel, sardines)

A quarter of an avocado sliced onto your eggs or a small handful of walnuts with your afternoon snack are exactly the kinds of additions that help.

Vegetables and Fruits: What You Need to Know

Non-starchy vegetables are essentially blood-sugar neutral — you can eat them in generous amounts without worrying. This includes spinach, kale, broccoli, cauliflower, zucchini, cucumbers, bell peppers, mushrooms, lettuce, and tomatoes.

Fruit is a bit more nuanced. It's nutritious and absolutely part of a healthy pregnancy diet, but natural sugars still raise blood sugar. The strategy: choose lower-sugar fruits (berries, apples, pears, peaches, citrus), keep portions reasonable (one small piece or a half cup), and always pair fruit with protein or fat. Try to limit tropical fruits like mango, pineapple, and grapes, dried fruit, and fruit juice.

Foods to Limit or Avoid With Gestational Diabetes

 
• Sugar foods and drinks (soda, candy, pastries, cookies)
 
• Seemingly "healthy" carb-rich snacks (granola bars, crackers, etc.)
 
• Flavored yogurts (with added sugar)
 
• Juices and smoothies
 
• Refined carbs and processed foods (white bread, white rice, regular pasta, breakfast cereals, chips, and instant meals)

Building Balanced Meals and Snacks

Whenever you're trying to change a habit, it's often best to go slow. Start experimenting with adding healthier foods to your plate, so you feel fuller and more satisfied.

The Plate Method Made Simple

This is a visual shortcut:

 
• Fill half your plate with non-starchy vegetables
 
• A quarter with lean protein
 
• A quarter with complex carbs
 
• A tablespoon of healthy fat

Example: grilled salmon (protein quarter), brown rice (carb quarter), a large serving of roasted broccoli and spinach salad (vegetable half), olive oil on the salad.

Meal Timing and Frequency

 
• Aim for three moderate meals and two to three healthy snacks throughout the day.
 
• Make breakfast savory and low-sugar (insulin rises most in the morning).
 
• Keep healthy snacks around to nibble on when needed (nuts, seeds, Greek yogurt, etc.).

Smart Snack Ideas

The formula for a good gestational diabetes snack is simple: protein plus a small amount of complex carb or fat. Some options that work:

 
• Apple slices + 2 tablespoons almond butter
 
• Celery and bell pepper strips + hummus
 
• Hard-boiled egg + a small handful of whole grain crackers
 
• Cottage cheese + a few berries
 
• A small handful of nuts + a piece of cheese
 
• Greek yogurt (plain, low-fat) + a tablespoon of chia seeds
 
• Sliced turkey + cucumber
 
• Edamame (half cup)

Practical Tips for Managing Your Diet

 
• Read food labels (about 175g of carbs per day may be your needs — check with your dietitian)
 
• Choose meals at restaurants that are whole-foods based (e.g. fish, vegetables, and potatoes)
 
• Have a healthy protein-filled meal or snack before social gatherings
 
• Aim to cook one or two big healthy meals per week and freeze them in portion sizes
 
• Keep healthy snacks with you (nuts, seeds, vegetables, etc.)

Monitoring Your Blood Sugar and Adjusting Your Diet

Testing your blood sugar — before meals and one to two hours after — is what tells you how you personally respond to food. Typical targets are:

 
• Fasting (before meals): under 95 mg/dL
 
• One hour after eating: under 140 mg/dL
 
• Two hours after eating: under 120 mg/dL

Your provider may set personalized targets for you. If your numbers are consistently out of range despite dietary changes, tell your healthcare team.

When Diet Alone Isn't Enough

You can do everything you can to eat well, but still need to be on medication. Metformin or insulin are the most common. The good news is that medication plus diet works better than either alone, and for most people, it stops after delivery.

Working With a Registered Dietitian

Managing gestational diabetes through diet isn't one-size-fits-all. How many carbs you need depends on your weight, activity level, how far along you are, and how your blood sugar responds to specific foods. A registered dietitian specializing in pregnancy nutrition can build a plan that accounts for all of that — and troubleshoot when your numbers aren't cooperating.

If you're feeling overwhelmed about how to reduce sugar intake and you have been diagnosed, you can get Medical Nutrition Therapy (MNT). That's a personalized eating plan and support with a registered dietitian — and it's often covered by insurance.

Managing gestational diabetes through diet is a lot easier with expert support. Check if your insurance covers a registered dietitian — most plans do.