If you're a new mom struggling with mood swings, you're not alone. Up to 1 in 7 mothers face mental health challenges like depression and anxiety after birth. While many factors contribute, one nutrient that deserves your attention is omega-3 fatty acids. Your body can't make these essential fats on its own, and pregnancy and breastfeeding can deplete your stores. The good news? Adding omega-3 rich foods to your daily meals is a practical, food-first way to support your emotional well-being.
Which of the following fish should you avoid while breastfeeding due to high mercury content?
Select one answer.
Why omega-3s matter for your mood
Omega-3 fatty acids, especially EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), are critical for brain function. Research shows that omega-3s can travel through brain cell membranes and interact with mood-related molecules, and they also have anti-inflammatory actions that may help relieve depression (Harvard Health).
During pregnancy, your baby's developing brain siphons large amounts of DHA from your own stores, often leaving you depleted. This deficiency may make you more vulnerable to postpartum depression (MGH Center for Women's Mental Health). A meta-analysis of randomized placebo-controlled trials found that omega-3 supplementation significantly improved depressive symptoms in perinatal women, with higher EPA/DHA ratios showing the most benefit (Translational Psychiatry).
Best omega-3 rich foods to add to your plate
Here are the top food sources to prioritize:
- Fatty fish: Salmon, sardines, herring, anchovies, and trout are excellent sources of EPA and DHA. Aim for 2-3 servings per week (about 8-12 ounces total).
- Low-mercury options: Choose low-mercury fish like salmon, sardines, and trout. Avoid high-mercury fish such as swordfish, shark, king mackerel, and tilefish (InfantRisk Center).
- Plant-based sources: Walnuts, flaxseeds, chia seeds, and hemp seeds provide ALA, a precursor to EPA/DHA, though conversion is limited.
- Algal oil: If you're vegetarian or vegan, algal oil is a rich source of DHA and is a good alternative to fish oil (LactMed).
How much do you need?
Current dietary recommendations for nursing mothers are 250-375 mg of DHA plus EPA daily (LactMed). However, some experts suggest that lactating women may need about 1 gram (1000 mg) of DHA plus EPA per day to achieve optimal breastmilk levels for their baby's brain development (LactMed).
To put that in perspective, one gram per day is roughly equivalent to eating three salmon meals per week (Harvard Health).
Practical ways to add omega-3s to your day
- Breakfast: Add ground flaxseed or chia seeds to your morning oatmeal or smoothie.
- Lunch: Top a salad with canned sardines or a salmon fillet.
- Snack: Grab a handful of walnuts or make a trail mix with seeds.
- Dinner: Grill or bake salmon with herbs and lemon. Aim for two servings of fatty fish per week.
- Supplement if needed: If you're not getting enough from food, consider a fish oil or algal oil supplement. Look for one with at least 60% EPA relative to DHA, as this ratio appears most effective for mood (Harvard Health).
A note on safety
Fish oil up to 3 grams daily is generally recognized as safe by the FDA (LactMed). However, always talk to your healthcare provider before starting any new supplement, especially if you're taking medication or have a medical condition.
Quiz: Test your knowledge
Which of the following fish should you avoid while breastfeeding due to high mercury content?
- Swordfish
- Salmon
- Sardines
How the Featured Expert Can Help
If you're in Maryland, Washington DC, or Wyoming and need personalized support for postpartum anxiety, depression, or burnout, Rooted Postpartum Care offers virtual, holistic mental health and nutrition-focused care. Led by psychiatric nurse practitioner Natalie Marchione, the practice provides individualized support that treats the whole person—your emotional well-being, nutrition, sleep, and stress levels are all considered. Reach out to get a care plan tailored to your needs.