If you’re overweight (BMI 25 to 29.9) and pregnant, you need fewer additional calories than you might expect. During the first trimester, you don’t need any extra calories at all. In the second trimester, add about 200 calories per day, and in the third trimester, about 400 extra calories per day. These numbers are smaller than the general “eating for two” advice because your body already has energy reserves it can draw from to support your baby’s growth.
Calorie Needs by Trimester
The common advice to “eat 300 extra calories a day” during pregnancy is a rough average that doesn’t account for starting weight. For women who begin pregnancy in the overweight BMI range, the CDC outlines a more tailored approach:
- First trimester: No extra calories needed. Your baby is tiny, and calorie demands haven’t meaningfully increased yet.
- Second trimester: About 200 additional calories per day. That’s roughly a Greek yogurt with berries, or a handful of nuts with a piece of fruit.
- Third trimester: About 400 additional calories per day. Think a small, balanced meal or two substantial snacks.
These are additions to whatever your body normally needs to maintain its current weight before pregnancy. For most overweight women, that baseline falls somewhere between 1,800 and 2,200 calories per day, depending on height, age, and activity level. So a typical third-trimester daily intake might land in the range of 2,200 to 2,600 calories. Your provider can help you pin down a more personalized number.
For women with a BMI of 30 or above (the obesity category rather than overweight), the guidance is even more conservative. Research from the National Institute of Diabetes and Digestive and Kidney Diseases suggests that pregnant women with obesity may not need any extra calories during the second or third trimesters at all, because the body can mobilize stored fat to meet the energy demands of the growing baby.
How Much Weight You Should Gain
The recommended total weight gain for overweight women carrying a single baby is 15 to 25 pounds over the entire pregnancy. That’s noticeably less than the 25 to 35 pounds recommended for women starting at a normal BMI. If you’re carrying twins, the range is 31 to 50 pounds.
Most of that gain happens in the second and third trimesters. A reasonable pace during those months is roughly half a pound per week, though it won’t be perfectly consistent from week to week. Some weeks you’ll gain more, some less. The overall trend matters more than any single weigh-in. Tracking your weight every week or two can help you spot patterns early, so you and your provider can adjust your eating plan if the numbers are climbing too fast or too slow.
Why Gaining Too Much Creates Real Risks
Exceeding the weight gain guidelines isn’t just about postpartum weight loss, though that’s certainly harder when you overshoot. Excessive gain during pregnancy significantly raises the odds of developing gestational diabetes, with one large review finding it nearly quintupled the risk. It also increases your chances of gestational hypertension, complications during labor and delivery, and even stillbirth in women with higher BMIs.
The effects extend beyond this pregnancy. Gaining more than recommended makes it harder to return to your pre-pregnancy weight, which compromises fertility and raises the stakes for future pregnancies. Each pregnancy that starts at a higher weight compounds the risks further. Staying within the 15 to 25 pound range is one of the most protective things you can do for both this pregnancy and the ones that may follow.
What to Eat When Calories Are Tight
When your calorie budget is only modestly above maintenance, every meal needs to pull more nutritional weight. The goal isn’t to eat less food overall. It’s to eat food that delivers more nutrients per calorie. A 200-calorie snack of almonds and an orange gives you fiber, healthy fat, folate, and vitamin C. A 200-calorie bag of chips gives you salt.
Prioritize protein at every meal. It supports your baby’s tissue growth, helps stabilize your blood sugar, and keeps you feeling full longer. Eggs, beans, lean meats, fish (low-mercury varieties like salmon and sardines), and Greek yogurt are all efficient choices. Pair them with vegetables, whole grains, and fruit to cover your fiber and micronutrient needs.
Iron, folate, calcium, and vitamin D are especially important during pregnancy, and prenatal vitamins help fill gaps. But supplements work best as a safety net, not a replacement for food quality. Dark leafy greens, fortified cereals, dairy or fortified plant milks, and legumes can cover a lot of ground without adding many calories.
Exercise Changes the Equation
Regular physical activity during pregnancy helps regulate blood sugar, improves sleep, reduces back pain, and makes it easier to stay within weight gain guidelines. Walking, swimming, and prenatal yoga are popular because they’re low-impact and easy to scale to your energy level on any given day. Most guidelines recommend 150 minutes of moderate activity per week, spread across several days.
If you’re exercising regularly, you may need slightly more fuel to avoid running a deficit, but the calorie recommendations above already account for a generally active lifestyle. You don’t need to precisely calculate calories burned during a walk and add them back. Instead, pay attention to hunger cues. If you’re consistently hungry after workouts, adding a small protein-rich snack is a reasonable adjustment.
Calorie Restriction Is Not the Same as Dieting
Pregnancy is not the time to pursue weight loss. Even though your calorie additions are modest, the goal is controlled, steady gain, not a deficit. Severely restricting calories can deprive your baby of essential nutrients and may trigger your body to break down muscle rather than fat for energy. It can also increase the risk of preterm birth and low birth weight.
That said, there’s a meaningful difference between aggressive dieting and simply not overeating. Staying close to your normal pre-pregnancy intake during the first trimester and adding only 200 to 400 calories later is not restriction. It’s matching your intake to what your body actually needs. The “eating for two” mentality often leads to consuming far more than pregnancy requires, regardless of starting weight.
One notable exception: for women who develop gestational diabetes, more structured calorie plans may be appropriate under medical supervision. A recent large trial found that a carefully designed 1,200-calorie diet in the third trimester reduced the need for insulin treatment in women with gestational diabetes and a BMI over 25. This kind of approach requires close monitoring and is not something to try on your own.