The Best Foods for the Second Trimester of Pregnancy

If the first trimester felt like survival mode by navigating nausea, fatigue, and the mental load of early pregnancy, the second trimester tends to come as a welcome relief. For many people, appetite returns, energy picks up, and eating starts to feel like something you can actually enjoy again. It's also when your baby shifts into a serious growth phase, making what you eat more impactful than ever. Here's what to know about diet and foods for the second trimester: what's happening developmentally, what to eat, and how to support your body through this new phase.

For most people, yes. By around weeks 12 to 14, the placenta takes over the primary job of hormone production and nutrient delivery to the baby. The sharp rise in hCG (the hormone largely responsible for early nausea) starts to level off, and many of those first-trimester symptoms begin to ease. Food aversions typically improve alongside nausea, and a lot of people find their appetite returning, sometimes aggressively.

That said, everyone's experience is different. Some people continue to feel nauseous well into the second trimester, and that's valid too. If nausea persists or is severe, it's worth looping in your healthcare provider.

To support these major processes, here's what to put on your plate:

One of the most significant physiological changes in the second trimester is what is called hemodilution. This is when your plasma volume expands dramatically (by up to 50% over the course of pregnancy), which causes a natural dilution of red blood cells. This can cause hemoglobin and ferritin levels to drop, making iron-deficiency anemia a real risk. Prioritize heme iron sources like slow-cooked meats, beef liver (in small amounts), and shellfish like clams and oysters. These types of iron-rich foods are absorbed significantly more efficiently than plant-based iron. Pair plant-based iron sources such as dark leafy greens, pumpkin seeds and legumes, with vitamin C-rich foods to further enhance absorption.

Protein needs jump notably in the second trimester to support fetal tissue growth and maternal changes. Before 20 weeks, the Estimated Average Requirement (EAR) is approximately 1.22 grams per kilogram of body weight per day. After 20 weeks, that increases to 1.52 grams per kilogram which is a meaningful bump. Focus on high-quality complete proteins: eggs, poultry, red meat, fish, and full-fat dairy. Greek yogurt, cottage cheese, and hard cheeses are easy, versatile options if you're still not loving heavy meals or food aversions haven’t fully dissipated. 

DHA is an omega-3 fatty acid found in fatty fish that is critical for fetal brain and eye development. The second trimester is a period of intense neurological growth making this brain-building nutrient even more important. Aim for 2 to 3 servings per week of low-mercury options. Sardines and canned salmon are great, cost-effective choices. Aim to avoid higher mercury fish like tuna, swordfish or yellowtail. 

As pregnancy progresses, insulin resistance naturally increases toward the end of the second trimester to provide more energy to the growing baby. While this is a normal process, it means blood sugar management becomes increasingly important. Aim for around 90 to 150 grams of carbohydrates per day from whole food sources: legumes, root vegetables, oats, and fruit. And remember the "no naked carbs" rule: always pair carbohydrates with a protein or fat to blunt the blood sugar response.

These remain cornerstones of a pregnancy diet in the second trimester. Spinach, kale, and broccoli supply folate (still essential for ongoing cell division and fetal development), iron, and vitamin K. Aim to fill about half your plate with non-starchy vegetables at most meals. The fiber in these foods will also support bowel movements, which may naturally slow down with the rise in hormones. 

Choline continues to be critical for fetal brain development and is worth emphasizing throughout pregnancy. Research shows that approximately 94% of women don't get enough choline from diet alone. Egg yolks and liver are your best dietary sources. (If those aren’t a part of your dietary preferences, ensure your prenatal vitamin contains a meaningful dose.). 

Dietary fat supports fat-soluble vitamin absorption (vitamins A, D, E, and K), hormone production, and fetal neurological development. Don't shy away from naturally occurring fats from whole food sources—they can help improve the absorption of those critical vitamins.

This is where things shift from the first trimester. While early pregnancy requires almost no increase in calories above your baseline, the second trimester does. Current guidelines suggest approximately 285 to 350 extra calories per day above your pre-pregnancy needs to support fetal growth, increased maternal tissue, and the expansion of blood volume. That's roughly the equivalent of a protein-rich snack (ie: a handful of nuts and some full-fat yogurt) rather than a second full meal.

Aim to build your plate with roughly 50% non-starchy vegetables, 25% high-quality protein and healthy fats, and 25% complex carbohydrates. 

The food safety guidelines from the first trimester remain just as relevant now. Continue to avoid:

• Raw or undercooked meats and shellfish, unpasteurized cheeses and deli meats, and unwashed produce. These can carry pathogens like Listeria, Toxoplasma, and Salmonella that carry serious risks throughout pregnancy.

• Alcohol: There is no established safe amount at any stage of pregnancy.

• Excessive caffeine: Keep intake under 200 mg per day (approximately one medium coffee). Higher caffeine consumption has been linked to restricted fetal growth and adverse pregnancy outcomes.

• High-mercury fish: Shark, swordfish, king mackerel, and tilefish should be avoided; limit albacore tuna to one serving per week.

One addition worth noting in the second trimester: as your uterus grows and displaces other organs, heartburn and reflux tend to worsen. Spicy foods, citrus, and large meals eaten close to bedtime may aggravate symptoms. Pay attention to your body and adjust accordingly.

The short answer is diet doesn't cause GD, but it can influence your risk, and it plays a central role in managing it if you're diagnosed. GD occurs when pregnancy hormones impair insulin's ability to regulate blood sugar effectively. While the hormonal shifts of pregnancy are outside your control, dietary patterns that chronically spike blood sugar can stress an already-challenged system. A diet high in refined carbohydrates and added sugars is associated with higher GD risk. On the other hand, a diet focused on fiber, protein, and low-glycemic foods is associated with lower risk. Standard screening for gestational diabetes happens between 24 and 28 weeks, so the second trimester is exactly the right time to be thinking about this.

A GD diagnosis can feel alarming, but for many people it's very manageable with dietary adjustments. The primary goal is keeping blood glucose levels within a target range after meals. A few factors to consider:

• Prioritize protein and fat at every meal: These macronutrients don't raise blood sugar and help slow the absorption of any carbohydrates you eat. Try to pair carbohydrates with protein, fats and fiber to blunt blood sugar spikes. 

• Distribute carbohydrates evenly throughout the day: Rather than eating a larger carbohydrate load at one sitting, spreading carbs across 3 meals and 2 to 3 snacks helps prevent spikes. Most GD meal plans target around 30 to 45 grams of carbohydrates per main meal and 15 to 30 grams per snack, though these numbers are individualized and you should work with your care team to decide what is best for you. 

• Minimize added sugars and refined carbohydrates: White bread, juice, sugary drinks, and heavily processed grains raise blood sugar quickly and offer minimal nutritional benefit. Swap for whole grains, legumes, and vegetables where possible.

• Be especially cautious at breakfast: Morning insulin resistance is typically highest in people with GD, meaning blood sugar spikes more easily after breakfast than other meals. A lower-carb, higher-protein breakfast like eggs with vegetables tends to work better than pancakes, pastries, or other sugar heavy options. .

• Monitor and adjust: Pairing foods and monitoring your post-meal blood glucose levels (usually 1 to 2 hours after eating) helps you identify which foods your body tolerates well. This is where working with a healthcare provider who specializes in GD can be really valuable.

For more detail, check out Bird&Be's post on gestational diabetes.

The second trimester is a real turning point, both physically and nutritionally. Your baby is growing rapidly, your body is changing, and your appetite is (hopefully) back on board to support all of it. Focus on protein, iron, healthy fats, and fiber-rich carbohydrates, keep your prenatal vitamin in the mix, and use this trimester to build the habits that will carry you through to the third trimester and beyond. You've got this!