Eating healthy during pregnancy comes down to getting more nutrients without dramatically increasing how much you eat. Most pregnant women need only about 300 extra calories per day, roughly the equivalent of a yogurt and a banana. The real shift is in what you eat, not how much.
How Many Calories You Actually Need
Calorie needs increase gradually across pregnancy, not all at once. For most women at a normal pre-pregnancy weight, the targets break down like this: about 1,800 calories per day in the first trimester, 2,200 in the second, and 2,400 in the third. That first-trimester number is essentially no change from what many women already eat, which surprises people who assume they need to “eat for two” from the start.
Those extra calories should come from nutrient-dense foods rather than empty ones. A handful of nuts, an extra serving of vegetables with hummus, or a piece of whole-grain toast with peanut butter covers the increase without requiring a whole additional meal.
Key Nutrients and Where to Find Them
Protein needs rise to about 71 grams per day during pregnancy. That’s achievable through a combination of lean meats, eggs, beans, dairy, nuts, and tofu. A chicken breast has roughly 30 grams, a cup of Greek yogurt about 15, and a cup of lentils around 18, so hitting this target doesn’t require drastic changes for most people.
Several vitamins and minerals become especially important:
- Folate: 600 micrograms per day, critical for preventing neural tube defects. Leafy greens, fortified cereals, and lentils are good sources, but a prenatal vitamin is the most reliable way to hit this number. Women planning pregnancy should start with 400 to 800 micrograms of folic acid from supplements before conception.
- Iron: 27 milligrams per day, nearly double the non-pregnant recommendation. Iron supports the dramatic increase in blood volume. Red meat, spinach, fortified cereals, and beans all contribute. Pairing iron-rich foods with vitamin C (like bell peppers or citrus) improves absorption.
- Calcium: 1,000 milligrams per day for women 19 and older. Your baby draws calcium from your bones if you don’t get enough. Dairy products, fortified plant milks, and canned salmon with bones are reliable sources.
- Vitamin D: 600 IU per day, which supports calcium absorption and bone development. Fortified milk, fatty fish, and egg yolks provide some, but many women need a supplement.
- Iodine: 220 micrograms per day, essential for thyroid function and brain development. Iodized salt, dairy, and seafood are the primary sources.
A good prenatal vitamin covers most of these gaps, but it works best alongside a varied diet rather than as a replacement for one.
What to Eat More Of
Build meals around whole foods: fruits, vegetables, whole grains, lean proteins, and healthy fats. A practical framework is to fill half your plate with vegetables and fruit, a quarter with a protein source, and a quarter with a whole grain like brown rice, quinoa, or whole-wheat bread.
Fish deserves a special mention because it’s one of the best sources of omega-3 fatty acids, which support your baby’s brain and eye development. The FDA recommends eating two to three servings per week (a serving is 4 ounces) from the “best choices” list: salmon, sardines, shrimp, cod, tilapia, catfish, pollock, and canned light tuna are all good options. Many women avoid fish entirely during pregnancy out of mercury concerns, but that means missing out on nutrients that are hard to get elsewhere.
Foods to Avoid or Limit
Some foods carry a higher risk of bacterial contamination, particularly from listeria, which can cause serious complications during pregnancy.
- High-mercury fish: King mackerel, marlin, shark, swordfish, orange roughy, bigeye tuna, and Gulf of Mexico tilefish. These accumulate enough mercury to affect fetal brain development.
- Deli meats and hot dogs: Unless heated until steaming, these can harbor listeria. The same goes for refrigerated pâté and meat spreads.
- Soft cheeses: Queso fresco, brie, camembert, and blue-veined cheese made from unpasteurized milk. Queso fresco-style cheeses carry risk even when made with pasteurized milk.
- Raw or undercooked eggs: This includes homemade Caesar dressing, raw cookie dough, and homemade eggnog.
- Raw fish and shellfish: Sushi, sashimi, and ceviche are off the list. Refrigerated smoked seafood (labeled as lox, nova-style, or kippered) should also be avoided unless cooked into a dish.
- Raw sprouts: Alfalfa and bean sprouts can contain bacteria even when washed thoroughly.
- Unpasteurized juice, cider, and milk.
- Premade deli salads: Potato salad, chicken salad, egg salad, and similar items from deli counters.
Always wash fresh fruits and vegetables before eating, and don’t leave cut melon sitting out for more than two hours (one hour if it’s above 90°F).
Caffeine
You don’t have to give up coffee entirely. Keeping intake under 200 milligrams per day does not appear to be a major contributing factor to miscarriage or preterm birth. That’s roughly one 12-ounce cup of brewed coffee. Keep in mind that tea, chocolate, and some sodas also contain caffeine, so factor those in if you’re tracking your total.
Staying Hydrated
Fluid needs increase during pregnancy to support the expansion in blood volume and the production of amniotic fluid. The target is about 12 cups (96 ounces) per day, up from the usual 8 to 10 cups. Water is ideal, but milk, herbal tea, and water-rich fruits like watermelon all count. If plain water feels unappealing, especially during the first trimester, adding a squeeze of lemon or drinking sparkling water can help.
Managing Nausea Through Food
Morning sickness peaks during the first trimester, and what you eat (and when) makes a real difference. Skipping meals tends to make nausea worse, so eating small amounts frequently is more effective than trying to power through three large meals.
Keep plain, dry crackers or toast by your bed and eat something bland as soon as you wake up, before getting out of bed. Stick to low-fat, easy-to-digest foods: plain rice or pasta, boiled potatoes, lean chicken, dry cereal, and simple fruits. Rich, greasy, or heavily spiced foods tend to trigger nausea more. Before bed, have a snack that combines protein and carbohydrate, such as cheese and crackers or yogurt with fruit, to help stabilize blood sugar overnight.
Ginger can settle nausea for some women. Ginger tea, ginger lollies, flat ginger ale, or ginger syrup are all worth trying. Rest after eating but avoid lying flat, which can worsen symptoms.
Healthy Weight Gain Targets
Weight gain during pregnancy varies based on your pre-pregnancy BMI. The current recommendations for a single baby are:
- Underweight (BMI under 18.5): 28 to 40 pounds
- Normal weight (BMI 18.5 to 24.9): 25 to 35 pounds
- Overweight (BMI 25.0 to 29.9): 15 to 25 pounds
- Obese (BMI 30.0 to 39.9): 11 to 20 pounds
Most weight gain happens in the second and third trimesters. A steady, gradual increase is more important than hitting an exact number each week. Gaining too little can affect fetal growth, while gaining too much increases the risk of gestational diabetes, high blood pressure, and a more difficult delivery.
Eating Well on a Vegan or Vegetarian Diet
A plant-based diet can absolutely support a healthy pregnancy, but a few nutrients need extra attention because they’re primarily found in animal products.
Vitamin B12 is the most critical one. Plant foods don’t naturally contain it, so you’ll need a daily supplement of 10 micrograms, even if your prenatal vitamin already includes some B12. Fortified plant milks, fortified cereals, and nutritional yeast flakes can supplement your intake further.
DHA, an omega-3 fat important for brain development, is another gap. The only vegan source is algae-based supplements, since plant foods like flaxseed provide a different form of omega-3 that the body converts poorly. Look for a supplement containing both EPA and DHA derived from algae.
Choline is often overlooked because most prenatal vitamins don’t include it. Plant-based sources include edamame, broccoli, Brussels sprouts, cauliflower, shiitake mushrooms, and legumes like navy beans and pinto beans. Getting enough through food alone takes deliberate planning, so a separate choline supplement is worth discussing with your provider.