Fertility Diet: The Best Foods to Boost Your Chances of Getting Pregnant

What you eat has a profound effect on your fertility—for both men and women. Decades of research, including landmark studies from the Harvard Nurses' Health Study and multiple randomised controlled trials, confirm that dietary patterns significantly influence ovulatory function, egg quality, sperm health, and early embryo development. This comprehensive guide covers the best fertility diet strategies, the specific foods that support conception, and what to avoid when trying to get pregnant.

The Fertility Diet: What the Research Shows

The most robust evidence for dietary impact on fertility comes from the Harvard Nurses' Health Study, which followed more than 18,000 women over eight years and identified several dietary factors associated with reduced ovulatory infertility. The resulting "Fertility Diet" emphasises:

• Slow-digesting carbohydrates (whole grains, legumes) over refined carbs and sugar
• Plant-based protein from legumes, tofu, and nuts rather than exclusively animal protein
• High-fat dairy rather than low-fat dairy (counterintuitive, but replicated in multiple analyses)
• Monounsaturated fats from olive oil and avocado over trans fats
• Iron from plant sources (non-haem iron) alongside haem iron from meat
• High-dose supplementation with folic acid (or methylfolate)

More recent research supports a Mediterranean dietary pattern as the most comprehensively beneficial eating style for fertility—combining the elements above into a culturally familiar framework.

Top Fertility Foods for Women

Specific foods with the strongest evidence for supporting female fertility:

• Leafy greens (spinach, kale, rocket): Rich in folate, iron, magnesium, and antioxidants. Folate is critical for egg development and early neural tube formation.
• Avocado: Exceptional source of monounsaturated fats and vitamin E, both linked to better embryo implantation rates in IVF studies.
• Full-fat dairy: Milk, yoghurt, and cheese (full-fat) are associated with lower rates of ovulatory infertility in population studies. The mechanism may involve fat-soluble hormones in dairy that support reproductive function.
• Beans and lentils: Excellent plant protein and a rich source of non-haem iron and folate. Women who replaced animal protein with plant protein in even 5% of caloric intake showed significantly reduced ovulatory infertility in the Harvard study.
• Berries (blueberries, raspberries, strawberries): High in antioxidants (vitamins C and E, anthocyanins) that protect egg cells from oxidative damage.
• Oily fish (salmon, sardines, mackerel): Rich in omega-3 fatty acids (DHA/EPA), which support egg quality, reduce inflammation, and may improve endometrial receptivity.
• Whole grains (quinoa, oats, brown rice): Stabilise blood sugar and insulin levels, improving hormonal balance and ovulatory regularity.
• Walnuts: Outstanding source of omega-3s, vitamin E, and melatonin—all with antioxidant properties relevant to egg quality.
• Pomegranate: Associated with improved uterine blood flow in some studies. Rich in ellagic acid and vitamin C.
• Brazil nuts: Just 2–3 per day provides your recommended daily selenium, an antioxidant essential for thyroid function (hypothyroidism is a common, often undiagnosed cause of fertility problems).

Top Fertility Foods for Men

Male fertility is equally responsive to diet. The following foods have the strongest evidence for improving sperm parameters:

• Oysters: The richest dietary source of zinc, critical for testosterone synthesis and sperm formation. Zinc deficiency is directly associated with low sperm count.
• Tomatoes: Exceptionally high in lycopene, an antioxidant that has been shown in clinical trials to improve sperm morphology and reduce DNA fragmentation. Cooked tomatoes (tomato paste, sauce) provide more bioavailable lycopene than raw.
• Pumpkin seeds: Rich in zinc, selenium, and omega-3 fatty acids. A convenient daily snack for male fertility support.
• Dark chocolate: Contains L-arginine, which improves sperm count and motility. Also rich in antioxidants. Choose 70%+ cacao content.
• Eggs: High in choline, selenium, and vitamin D—all relevant to sperm health. Also contain L-carnitine, essential for sperm energy metabolism.
• Spinach: Excellent folate source. Men with higher folate intake show lower rates of chromosomal abnormalities in sperm.
• Pomegranate juice: Consistently associated with improvements in sperm motility and concentration in clinical studies, likely due to punicalagin antioxidants.

What to Avoid: Foods and Habits That Harm Fertility

Equally important is knowing what to limit or eliminate:

• Trans fats: Found in partially hydrogenated oils, some margarines, fried fast foods, and processed baked goods. Trans fats are directly linked to ovulatory infertility—replacing just 2% of calories from trans fats with monounsaturated fats nearly halved ovulatory infertility risk in the Harvard study.
• Refined sugar and high-GI foods: White bread, sugary drinks, and sweets spike insulin and disrupt the hormonal signalling that regulates ovulation. For women with PCOS, managing glycaemic load is especially critical.
• Excessive soy: Soy contains phytoestrogens that may interfere with hormonal signalling at very high intake levels. Moderate consumption (a few servings per week) appears safe; excessive soy protein supplementation warrants caution.
• Processed meats: Ham, salami, sausages, and hot dogs are associated with reduced sperm quality in men and worse IVF outcomes in women. Limit to occasional consumption.
• Low-fat dairy: Multiple studies suggest low-fat dairy is associated with higher rates of anovulatory infertility. This may be due to hormonal changes that occur when fat is removed from dairy products.
• Alcohol: Impairs ovulation, egg quality, and endometrial receptivity in women; reduces testosterone and sperm quality in men. Both partners should ideally eliminate alcohol when actively trying to conceive.
• Excessive caffeine: Evidence is mixed, but most fertility specialists recommend limiting caffeine to <200mg/day (approximately one cup of coffee) during TTC.
• Pesticide-laden produce: Certain pesticides are endocrine disruptors. Choosing organic options for the most-contaminated fruits and vegetables (the "Dirty Dozen" list) reduces exposure.

Supplements: Filling the Gaps in Your Fertility Diet

Even an excellent diet may leave gaps that supplementation can fill:

• Folate/methylfolate: The UK, EU, and most fertility guidelines recommend 400–800mcg daily from at least 3 months before conception. Women with MTHFR gene variants should use methylfolate rather than synthetic folic acid.
• Vitamin D: Deficiency is extremely common in Hong Kong and worldwide due to indoor lifestyles and sunscreen use. Optimal levels (50–80 ng/mL) are associated with better fertility outcomes.
• Omega-3 (DHA/EPA): If oily fish isn't consumed 2–3 times per week, a high-quality omega-3 supplement provides important fertility-relevant fatty acids.
• CoQ10: Particularly valuable for women over 35, where mitochondrial function in eggs declines. Doses of 200–600mg/day are commonly recommended.
• Iron: Only supplement if blood tests confirm deficiency, as excess iron carries its own risks.

Conceive Plus offers a comprehensive fertility supplement range designed for both partners. Visit conceiveplus.hk/collections/fertility-supplements for the full range.

Sample Day on a Fertility Diet

Breakfast: Greek yoghurt (full-fat) with mixed berries, walnuts, and a drizzle of honey. Green tea.
Mid-morning: 2 Brazil nuts and a small handful of pumpkin seeds.
Lunch: Large salad with leafy greens, avocado, lentils, cherry tomatoes, and a poached egg. Olive oil dressing.
Afternoon snack: Apple with almond butter.
Dinner: Baked salmon with roasted asparagus, quinoa, and steamed broccoli.
Evening: A small square of dark chocolate (70%+).

This day provides substantial folate, omega-3s, antioxidants, full-fat dairy, plant and animal protein, low-GI carbohydrates, and minimal refined sugar—hitting nearly every evidence-based fertility nutrition target.

FAQ: Fertility Diet