Fertility Diet: What to Eat (and Avoid) When Trying to Conceive

What you eat before and during your conception journey has a direct, measurable effect on both male and female fertility. The emerging field of nutritional reproductive medicine has identified specific dietary patterns, foods, and nutrients that significantly improve fertility outcomes — and equally, foods and dietary habits that actively work against conception. A strategic fertility diet is not about restriction; it's about giving your reproductive system the raw materials it needs to function optimally.

This guide covers the evidence-based fertility diet principles that fertility specialists and nutritional researchers consistently recommend, along with practical food lists and the key nutrients that bridge the gap between what diet provides and what optimal reproductive health requires.

The Mediterranean Diet: The Gold Standard for Fertility Nutrition

Of all dietary patterns studied in relation to fertility, the Mediterranean diet has the most robust evidence base. A landmark study published in Fertility and Sterility found that women following a Mediterranean dietary pattern had significantly higher IVF success rates than those following a Western-style diet. Similar findings have been replicated in natural conception studies.

The Mediterranean diet is characterised by:

• High intake of vegetables, legumes, and whole grains
• Abundant fruits and berries (rich in antioxidants)
• Liberal olive oil as the primary fat source
• Moderate fatty fish consumption (2–3 servings per week)
• Moderate dairy, predominantly yoghurt and cheese
• Low to moderate meat (lean poultry over red meat)
• Minimal processed foods, refined sugars, and trans fats

What makes this pattern so fertility-supportive? It consistently delivers high antioxidant load (protecting egg and sperm from oxidative damage), a favourable omega-3 to omega-6 ratio (reducing systemic inflammation), and sustained blood glucose levels (supporting hormonal stability).

Key Fertility Foods for Women

Folate-Rich Vegetables

Folate — the natural form of folic acid found in food — is essential for DNA synthesis, cell division, and neural tube development. Dark leafy greens (spinach, kale, broccoli), asparagus, avocado, and lentils are among the richest food sources. While supplementation is essential for reaching therapeutic levels, incorporating folate-rich foods provides additional nutritional benefits beyond what isolated supplements offer.

Full-Fat Dairy

The landmark Harvard Nurses' Health Study found that women who consumed full-fat dairy products had significantly lower rates of ovulatory infertility compared to those consuming low-fat dairy. The proposed mechanism involves fat-soluble hormones present in full-fat products that support follicular development. Full-fat yoghurt (particularly high in calcium and probiotics), whole milk, and aged cheese are the best fertility-supporting dairy options.

Fatty Fish

Salmon, sardines, mackerel, and trout provide DHA and EPA — the long-chain omega-3 fatty acids that support follicular development, reduce inflammation, and are critical for early foetal brain and retinal development. Aim for 2–3 servings per week, choosing low-mercury options. Avoid high-mercury fish (shark, swordfish, king mackerel) which can impair fertility and foetal development.

Legumes

Lentils, chickpeas, and beans provide plant-based protein, folate, iron, and fibre. The Harvard study also found that replacing animal protein with plant protein reduced ovulatory infertility risk — and legumes are the optimal vehicle for this substitution, providing essential amino acids without the hormonal load of some animal proteins.

Berries and Brightly Coloured Fruits

Blueberries, raspberries, pomegranate, and citrus fruits are particularly rich in flavonoids, anthocyanins, and Vitamin C — antioxidants that protect maturing eggs from oxidative damage. Pomegranate has been specifically studied for its antioxidant content and potential to improve endometrial blood flow and receptivity.

Eggs and Choline

Eggs are one of the richest dietary sources of choline — a B-vitamin-like nutrient essential for cell membrane integrity and neural tube formation. Many women are deficient in choline, as standard prenatal vitamins often contain minimal amounts. 2–3 eggs daily provides significant choline alongside high-quality protein and Vitamin D.

Key Fertility Foods for Men

Zinc-Rich Foods

Oysters are the richest dietary source of zinc, followed by red meat, pumpkin seeds, and legumes. Zinc is essential for spermatogenesis, testosterone production, and the antioxidant enzyme superoxide dismutase that protects sperm from oxidative damage.

Walnuts

A randomised controlled trial found that men who added 75g of walnuts daily to their diet for 12 weeks showed significant improvements in sperm vitality, motility, and morphology. Walnuts provide ALA (plant-based omega-3), vitamin E, and polyphenols — a potent combination for sperm health.

Tomatoes (Cooked)

Lycopene — the carotenoid that gives tomatoes their red colour — is highly concentrated in seminal plasma and protects sperm from oxidative damage. Importantly, cooked tomatoes (in pasta sauce, soup, or roasted) provide more bioavailable lycopene than raw tomatoes because heat breaks down the cell walls that trap lycopene.

Brazil Nuts (Selenium)

Just 2–3 Brazil nuts daily provides approximately 200 mcg of selenium — above the recommended upper limit for long-term use, so moderation is key. Selenium is essential for forming the fibrous sheath around sperm tails and is a component of glutathione peroxidase, the enzyme that protects sperm from peroxidative damage.

Foods to Limit or Avoid for Fertility

Ultra-Processed Foods

The ultra-processed food category (packaged snacks, fast food, commercially baked goods, processed meats) is consistently associated with worse fertility outcomes. These foods are typically high in trans fats, refined carbohydrates, artificial additives, and advanced glycation end-products (AGEs) — all of which promote oxidative stress and systemic inflammation, the twin enemies of reproductive health.

Trans Fats

The Harvard Nurses' Health Study found that every 2% increase in trans fat calories (replacing other energy sources) was associated with a 73% higher risk of ovulatory infertility. Trans fats impair insulin signalling and promote inflammation. While partially hydrogenated oils are now largely banned in many countries, trans fats remain in some packaged foods and are formed during high-temperature cooking of certain vegetable oils.

High-Mercury Fish

Mercury is a reproductive toxin that accumulates in fatty tissues and can impair both sperm function and egg quality. Shark, swordfish, orange roughy, and bigeye tuna are highest in mercury and should be avoided by anyone trying to conceive. Canned light tuna and small fatty fish are generally safe.

Excessive Alcohol

Even moderate alcohol consumption (3–6 drinks per week) has been associated with reduced fertility in both men and women. Heavy alcohol use disrupts hormone production, impairs sperm quality, and is the leading cause of preventable birth defects. The safest approach when actively trying to conceive is elimination or very minimal consumption.

High-Sugar Foods and Refined Carbohydrates

Rapid blood glucose fluctuations drive insulin spikes that can disrupt ovarian hormone production and exacerbate PCOS. Replacing refined carbohydrates (white bread, pasta, rice, sugary beverages) with low-glycaemic alternatives (whole grains, legumes, sweet potato) stabilises blood glucose and supports hormonal balance.

Excessive Caffeine

Current evidence suggests that moderate caffeine consumption (up to 200 mg/day — roughly one strong coffee) is unlikely to significantly impair fertility. However, higher intakes (above 300 mg/day) have been associated with modestly increased miscarriage risk. Reducing to 1–2 coffees per day is a reasonable precaution.

The Fertility Diet and Body Weight

Both underweight and overweight significantly impair fertility. Excess body fat promotes oestrogen excess (as fat tissue converts androgens to oestrogen) and insulin resistance, disrupting ovulation. Underweight suppresses GnRH and LH pulsatility, often causing anovulation. For men, obesity is associated with lower testosterone, higher oestrogen, and poorer sperm parameters.

A Mediterranean-style fertility diet naturally supports healthy weight management through its emphasis on fibre-rich vegetables, legumes, and whole foods that promote satiety, and its de-emphasis on energy-dense, nutrient-poor processed foods. However, the fertility diet is not a weight loss diet per se — if significant weight change is clinically indicated, a registered dietitian with fertility specialisation can provide personalised support.

Bridging the Gap: Fertility Supplements for Australians

Even the most conscientious fertility diet may not provide therapeutic levels of specific nutrients. CoQ10, for example, cannot be obtained in meaningful amounts from food — you would need to eat kilograms of meat to approach fertility-relevant doses. Vitamin D is synthesised primarily through sun exposure in Australia, but many Australians — particularly those who work indoors or have darker skin tones — are still deficient. Methylfolate is substantially more bioavailable than folic acid from fortified foods, and many women have genetic variants that impair folic acid conversion.

Conceive Plus fertility supplements are designed to complement, not replace, a nutrient-rich diet. They provide targeted doses of the nutrients with the strongest evidence base for reproductive health — CoQ10, methylfolate, Vitamin D3, antioxidants, and key trace minerals — in bioavailable forms that food sources rarely deliver consistently.

Practical Meal Planning for a Fertility Diet

A sample day of fertility-optimised eating might look like:

• Breakfast: Greek yoghurt with mixed berries, 2 tablespoons of walnuts or ground flaxseed, and 2 eggs (scrambled or poached)
• Lunch: Large salad with leafy greens, avocado, lentils, cherry tomatoes, olive oil and lemon dressing
• Snack: Apple with almond butter, or a handful of mixed nuts including Brazil nuts (2–3 only)
• Dinner: Grilled salmon with roasted vegetables (broccoli, sweet potato, bell peppers), served over quinoa or brown rice

This approach delivers folate, omega-3s, antioxidants, plant and animal protein, iron, zinc, selenium, and complex carbohydrates — the nutritional foundation for optimal reproductive health.

Frequently Asked Questions About the Fertility Diet

Q: How long does it take for dietary changes to affect fertility?

A: Sperm production takes approximately 72–90 days. Egg development within follicles also spans several months. Meaningful improvements from dietary changes are typically seen after 3–6 months, which is why fertility specialists recommend dietary optimisation well before a planned conception attempt.

Q: Is a vegan diet compatible with fertility?

A: A well-planned vegan diet can support fertility, but requires careful attention to nutrients predominantly found in animal products: Vitamin B12, long-chain omega-3s (DHA/EPA — not adequately provided by plant ALA), iron, zinc, and Vitamin D. Supplementation is typically necessary, and consulting a fertility-aware dietitian is advisable.

Q: Do I need to avoid soy if trying to conceive?

A: The research on soy and fertility in humans is generally reassuring for moderate, whole-food soy consumption (tofu, edamame, tempeh). The phytoestrogens in soy (isoflavones) do not appear to meaningfully disrupt reproductive hormones at typical dietary intake levels. Highly processed soy products in excessive amounts are less studied and less recommended.

Q: Should I take a prenatal vitamin even before I'm pregnant?

A: Yes. Preconception supplementation — ideally beginning 3 months before trying to conceive — ensures that nutrient levels are optimised from the moment of conception. Neural tube development occurs in the first weeks of pregnancy, often before a woman knows she is pregnant, making prior supplementation essential.

Q: Can diet improve sperm quality?

A: Absolutely. The landmark EARTH study and multiple other research programmes have documented significant associations between dietary patterns (particularly Mediterranean-style eating) and sperm quality parameters including motility, morphology, and DNA integrity. Men have equal reason to optimise their diet when trying to conceive.

Q: Is intermittent fasting safe when trying to conceive?

A: For women with regular cycles and healthy weight, moderate time-restricted eating (e.g., 12:12 or 14:10) is likely safe. However, more aggressive fasting protocols can suppress reproductive hormones — the hypothalamus is sensitive to energy restriction signals. For women with irregular cycles or low BMI, fasting protocols are not recommended without professional guidance.

Q: Does sugar really affect fertility?

A: High refined sugar intake drives insulin resistance, which impairs ovarian hormone signalling and exacerbates PCOS. Sugar-sweetened beverages are particularly problematic — studies have linked daily consumption of sugary drinks to reduced fertility in both men and women. Natural fruit sugars consumed within whole fruit (with fibre) have a very different metabolic profile and are not the concern.

Q: Are there fertility superfoods I should eat every day?

A: Rather than focusing on any single superfood, a consistent pattern of fertility-supportive eating is more important. That said, foods with particularly strong evidence for fertility benefits include: leafy greens, berries, eggs, fatty fish (2–3x weekly), avocado, walnuts, legumes, and olive oil. Including a variety of these daily creates a dietary pattern that reliably supports reproductive health.

Conclusion: Food as Your Fertility Foundation

A strategic fertility diet is one of the most accessible and evidence-based interventions available to couples trying to conceive. By emphasising whole foods rich in antioxidants, healthy fats, folate, and key minerals, and by limiting the processed foods, trans fats, and excess sugars that promote oxidative stress and hormonal disruption, you create the nutritional environment in which conception is most likely to succeed.

Complement your dietary approach with targeted supplementation from Conceive Plus to ensure you're reaching therapeutic levels of the nutrients most critical for reproductive health — and give yourself the best possible foundation for conception.