Fertility Diet & Nutrition: What to Eat When Trying to Conceive

The Mediterranean Diet: Most Evidence-Based Approach

The Mediterranean diet is the most studied eating pattern for fertility, with multiple large studies showing improved outcomes. A landmark study in Fertility & Sterility found that women who closely followed Mediterranean eating patterns had a 40% higher chance of IVF success compared to those with the lowest adherence. Here's what this diet emphasizes:

• Abundant vegetables (aim for 5+ servings daily) in a rainbow of colors
• Whole fruits, especially berries rich in antioxidants
• Whole grains like quinoa, brown rice, and whole wheat bread
• Extra virgin olive oil as your primary cooking fat (2-3 tablespoons daily)
• Fish and seafood 2-3 times weekly (choose low-mercury options)
• Legumes, nuts, and seeds for plant-based protein
• Moderate amounts of poultry, eggs, and dairy
• Limited red meat (once weekly or less)
• Herbs and spices instead of excess salt
• Red wine in moderation (though abstaining during TTC is safest)

Key Nutrients for Female Fertility

Specific nutrients play crucial roles in egg quality, ovulation, and creating a healthy environment for implantation. While a varied diet should provide most nutrients, understanding their importance helps you make informed food choices:

• Folate (400-800mcg daily): Essential for cell division and preventing neural tube defects. Found in leafy greens, citrus, beans, and fortified grains. Start supplementing at least 3 months before conception.
• Vitamin D: Low levels are linked to PCOS, endometriosis, and poorer IVF outcomes. Get tested and supplement if below 30 ng/mL. Sources include fortified foods, fatty fish, and safe sun exposure.
• Iron: Important for ovulation and implantation. Women with adequate iron stores have better fertility outcomes. Choose heme iron (meat, poultry) or pair plant sources with vitamin C for absorption.
• Omega-3 fatty acids: Reduce inflammation and support hormone production. Aim for 2-3 servings of fatty fish weekly (salmon, sardines, mackerel) or consider a quality fish oil supplement.
• Antioxidants (vitamins C, E, selenium): Protect eggs from oxidative damage. Found in colorful fruits and vegetables, nuts, and seeds.
• Iodine: Critical for thyroid function, which regulates fertility hormones. Found in iodized salt, seafood, and dairy.

Key Nutrients for Male Fertility

Sperm quality is significantly influenced by nutrition, and because sperm take about 74 days to develop, dietary changes made today affect sperm quality 2-3 months later. Key nutrients for men include:

• Zinc: Essential for testosterone production and sperm development. Found in oysters, beef, pumpkin seeds, and chickpeas.
• Selenium: Protects sperm from oxidative damage and supports motility. Brazil nuts are the richest source (2-3 daily provides adequate selenium).
• Coenzyme Q10: Supports sperm energy production and motility. Found in organ meats, fatty fish, and spinach.
• Vitamin C and E: Antioxidants that protect sperm DNA. Found in citrus fruits, bell peppers, almonds, and sunflower seeds.
• L-carnitine: Amino acid that fuels sperm movement. Found in red meat and dairy.
• Folate: Contributes to healthy sperm DNA. Found in leafy greens, beans, and fortified grains.

Foods and Substances to Limit or Avoid

Certain foods and substances have been linked to reduced fertility in research studies. While occasional consumption is unlikely to cause problems, regular intake of these items may impact your fertility:

• Trans fats: Found in some fried foods, baked goods, and margarine. Strongly linked to ovulatory infertility.
• Excessive sugar and refined carbohydrates: Can worsen insulin resistance, particularly problematic for PCOS.
• Alcohol: Even moderate drinking is associated with reduced fertility. During IVF, abstaining is recommended.
• Caffeine: Keep under 200mg daily (about one 12oz coffee). High intake is linked to miscarriage risk.
• Ultra-processed foods: Associated with inflammation and poorer fertility outcomes in multiple studies.
• High-mercury fish: Avoid shark, swordfish, king mackerel, and tilefish. Mercury accumulates and can harm fetal development.
• Unpasteurized dairy and raw meats: Risk of listeria and other infections harmful to pregnancy.
• Excessive soy: While moderate soy is fine, very high intake may affect hormones (this is debated in research).

Practical Meal Planning Tips

Implementing fertility-friendly eating doesn't require perfection. Focus on progress, not perfection, and build sustainable habits:

• Start with breakfast: Protein-rich breakfasts (eggs, Greek yogurt) stabilize blood sugar and support hormone balance.
• Batch cook on weekends: Prepare grains, roasted vegetables, and proteins to assemble quick meals during the week.
• Keep fertility-friendly snacks handy: Nuts, hummus with vegetables, Greek yogurt, or fruit with nut butter.
• Eat the rainbow: Aim for at least 3 different colored vegetables daily to maximize antioxidant intake.
• Choose whole grains: Swap white rice for brown, white bread for whole grain. The fiber helps regulate insulin and hormones.
• Don't skip meals: Regular eating helps maintain stable blood sugar and hormone levels.
• Stay hydrated: Aim for 8+ glasses of water daily. Hydration supports cervical mucus production and overall health.
• Cook at home more often: Restaurant meals are typically higher in sodium, unhealthy fats, and calories.

Special Considerations for PCOS

If you have polycystic ovary syndrome, nutrition strategies that address insulin resistance are particularly important. Women with PCOS may benefit from a lower glycemic approach while maintaining the Mediterranean diet principles:

• Focus on low-glycemic carbohydrates: Swap refined grains for whole grains, and pair carbs with protein or fat.
• Include protein at every meal: Helps stabilize blood sugar and reduce cravings.
• Anti-inflammatory foods: Extra emphasis on omega-3s, turmeric, ginger, and leafy greens.
• Limit added sugars: Particularly problematic for insulin-resistant PCOS.
• Consider intermittent fasting: Some women with PCOS find time-restricted eating helpful (consult your doctor first).
• Inositol-rich foods: Buckwheat, beans, and citrus fruits contain this insulin-sensitizing compound.

Key takeaways

• The Mediterranean diet has the strongest research support for fertility in both partners
• Key nutrients include folate, vitamin D, omega-3s, and antioxidants for women; zinc, selenium, and antioxidants for men
• Changes in diet affect egg quality over 3 months and sperm quality over 2-3 months—start early
• Limit alcohol, caffeine (under 200mg), trans fats, and ultra-processed foods
• Focus on whole foods rather than supplements—nutrients work synergistically in food
• For PCOS, emphasize low-glycemic eating and anti-inflammatory foods

Frequently asked questions