Fertility Diet: What to Eat When You're Trying to Conceive

The fertility diet isn't a fad — it's a growing body of evidence-backed nutritional science. What you eat in the months before conception shapes egg quality, sperm health, hormonal balance, and uterine receptivity. For both partners, nutrition is one of the most modifiable factors in reproductive health.

This guide summarises the best-available science on fertility diet principles, highlighting the foods and nutrients most strongly associated with improved conception outcomes, and those that may be silently undermining your chances.

The Evidence Base: What Research Tells Us

Two landmark studies anchor the modern fertility diet approach:

The Nurses' Health Study (Harvard School of Public Health), which followed over 17,000 women for 8 years, identified a cluster of dietary and lifestyle habits associated with significantly lower rates of ovulatory infertility. Women who followed what the researchers labelled the "Fertility Diet" reduced their risk of ovulatory infertility by up to 66% compared to those who didn't.

Key components of the Harvard Fertility Diet included:

• Higher intake of monounsaturated fats over trans fats
• Vegetable protein preferred over animal protein
• High-fat dairy preferred over low-fat dairy
• Low glycaemic carbohydrates (wholegrains, legumes)
• Higher iron intake from plant sources
• Multivitamin use, particularly folic acid

The DIET cohort study (2020, Human Reproduction) found that adherence to a Mediterranean-style diet was associated with higher rates of clinical pregnancy and live birth in women undergoing IVF — a finding replicated in multiple subsequent meta-analyses.

The Fertility Plate: What to Fill It With

Complex Carbohydrates

Refined carbohydrates spike blood sugar and insulin, which disrupts hormonal signalling in the ovaries. Insulin resistance — even at subclinical levels — is a common driver of PCOS and ovulatory dysfunction.

Choose instead:

• Quinoa, barley, oats, and brown rice
• Legumes (lentils, chickpeas, black beans)
• Root vegetables (sweet potato, beetroot)
• Whole fruit over fruit juice

The goal is a low glycaemic load diet that maintains steady blood glucose and supports healthy insulin sensitivity in ovarian tissue.

Healthy Fats

Omega-3 fatty acids are essential for prostaglandin synthesis, anti-inflammatory signalling, and embryo development. The DHA fraction is particularly important for early neural development post-fertilisation.

Best fertility fat sources:

• Oily fish: salmon, sardines, mackerel (2–3 servings/week)
• Walnuts, flaxseeds, chia seeds
• Extra virgin olive oil
• Avocado

Avoid trans fats (partially hydrogenated oils in processed foods) entirely. The Nurses' Health Study found that even a 2% increase in energy from trans fats was associated with a 73% higher risk of ovulatory infertility.

Protein Sources

The Harvard research found that replacing one serving of animal protein with plant protein per day reduced ovulatory infertility risk by 50%. This doesn't mean becoming vegetarian — it means diversifying protein sources:

• Legumes (lentils, beans, edamame) as primary protein sources
• Tofu and tempeh
• Nuts and nut butters
• Eggs (an ideal fertility food — rich in choline, folate, and DHA)
• Fish over red meat when choosing animal protein

Full-Fat Dairy

Counterintuitively, full-fat dairy (not low-fat) was associated with better fertility outcomes in the Nurses' Health Study. One possible mechanism: the fat in dairy contains reproductive hormones (oestrogen, progesterone precursors) removed in skim milk processing. Another theory involves the role of dairy fats in insulin signalling.

Aim for 1–2 servings of full-fat dairy daily: whole milk yoghurt, full-fat cheese, or whole milk.

Key Fertility Nutrients: The Non-Negotiables

Folate (Folic Acid)

The most well-established fertility and early pregnancy nutrient. Folate is essential for DNA synthesis, cell division, and neural tube formation. Supplementation should begin at least 3 months before conception. The recommended dose is 400–800 mcg daily; women with MTHFR gene variants should use methylfolate rather than synthetic folic acid.

Omega-3 (DHA/EPA)

For women, omega-3 improves oocyte quality, reduces inflammation, and supports endometrial receptivity. For men, DHA is a structural component of sperm cell membranes — low DHA is associated with poor sperm morphology. Supplement with algae-derived DHA if fish consumption is limited.

CoQ10 (Ubiquinol)

CoQ10 is essential for mitochondrial energy production — and eggs have the highest mitochondrial density of any cell in the human body. Declining CoQ10 with age (levels fall significantly after 30) is one reason why egg quality declines. Studies show 200–600mg/day improves ovarian response and egg quality in women over 35. For men, CoQ10 supplementation has been shown to improve both sperm motility and morphology.

Vitamin D

Vitamin D receptors are found throughout the reproductive system — in granulosa cells, the endometrium, and testicular tissue. Vitamin D deficiency (extremely common in Australia despite the climate, due to indoor lifestyles and sun avoidance) is associated with reduced IVF success rates, poorer endometrial receptivity, and lower testosterone in men. Aim for serum 25-OH vitamin D levels >75 nmol/L.

Iron

Non-haem (plant) iron was specifically associated with reduced ovulatory infertility risk in the Nurses' Health Study. Iron is required for ribonucleotide reductase activity — essential for DNA synthesis during rapidly dividing cells (including developing eggs and embryos). Combine plant iron sources with vitamin C for enhanced absorption.

Zinc and Selenium

Both are antioxidant minerals critical for sperm production and egg quality. Zinc is required for testosterone production and sperm development; selenium is a component of selenoproteins that protect sperm from oxidative damage. Low selenium is associated with poor sperm motility in men.

Foods to Limit or Avoid on a Fertility Diet

Evidence supports reducing or eliminating:

• Alcohol: Even 1–2 drinks per day has been associated with reduced conception rates in some studies. The safe amount during TTC is unknown; abstinence or minimal consumption is advisable.
• Processed and ultra-processed foods: High in trans fats, refined sugars, and artificial additives — all associated with increased oxidative stress and inflammation.
• High-mercury fish: Swordfish, shark, king mackerel, and tilefish should be avoided due to mercury's neurotoxic effects on developing embryos.
• Excessive caffeine: Over 200–300mg/day (roughly 2 cups of coffee) has been associated with increased miscarriage risk in some studies. Moderate consumption appears safe.
• Low-fat dairy products: Counterintuitive but supported by data — replace with full-fat equivalents during TTC.

Fertility Supplements: Bridging the Nutritional Gap

Even the best fertility diet may leave nutritional gaps, particularly for specific micronutrients difficult to obtain through food alone (CoQ10, methylfolate, DHA in adequate doses). Conceive Plus fertility supplements are formulated to complement a fertility-focused diet, providing evidence-backed nutrients at clinically relevant doses.

The Conceive Plus women's fertility supplement includes folate (as methylfolate for enhanced bioavailability), CoQ10, vitamin D3, omega-3, and key antioxidant minerals — covering the nutritional priorities most strongly linked to improved egg quality and conception rates. For men, the Conceive Plus male fertility formula targets sperm health with zinc, selenium, CoQ10, L-carnitine, and vitamin D.

The Mediterranean Diet: A Practical Fertility Framework

Rather than following complex rules, many fertility nutritionists recommend using the Mediterranean diet as a practical framework. It naturally incorporates most of the evidence-backed fertility diet principles:

• Abundance of vegetables, fruits, legumes, and whole grains
• Fish as the primary animal protein
• Olive oil as the primary fat
• Moderate full-fat dairy
• Limited red meat
• Very limited processed foods

Multiple meta-analyses have confirmed Mediterranean dietary patterns' association with improved IVF outcomes, reduced time to conception, and better sperm parameters. It's the most evidence-backed dietary pattern for fertility in both men and women.

Frequently Asked Questions: Fertility Diet

Q: How long does dietary change take to improve fertility?
A: Egg development (folliculogenesis) takes approximately 90 days. Sperm production (spermatogenesis) also takes approximately 74 days. For maximum impact, start dietary improvements at least 3 months before TTC.

Q: Should both partners follow a fertility diet?
A: Yes — male factor is involved in approximately 50% of infertility cases. Optimising both partners' nutrition addresses both sides of the equation simultaneously.

Q: Is a vegetarian or vegan diet compatible with fertility?
A: Yes, with careful planning. Key nutrients to supplement on plant-based diets: vitamin B12, DHA (algae-based), iron (with vitamin C), zinc, and iodine. Protein adequacy from diverse plant sources is achievable.

Q: Does sugar really affect fertility?
A: High sugar intake drives insulin resistance, which disrupts ovarian hormone signalling. Reducing refined sugar — especially sugar-sweetened beverages — is one of the highest-impact dietary changes for fertility.

Q: Can a fertility diet help with PCOS?
A: Yes, significantly. A low-GI, anti-inflammatory diet directly addresses the insulin resistance underlying PCOS, often improving ovulation frequency without medication. Combined with Myo-Inositol supplementation, dietary changes are first-line management for PCOS-related ovulatory dysfunction.

Q: Are fertility supplements necessary if I eat well?
A: Supplements are not a replacement for diet — but they address specific needs (CoQ10, methylfolate, DHA at therapeutic doses) that are difficult to meet through food alone, particularly for women over 35 or those with identified deficiencies.

Q: What should I eat during the two-week wait?
A: Continue your fertility diet. Focus on nutrient-dense foods, adequate protein and healthy fats for embryo support, and foods rich in folate (leafy greens, legumes) to support early neural development if implantation occurs.

Q: Does BMI affect dietary recommendations?
A: Yes. Both overweight and underweight have specific dietary implications for fertility. If BMI is above 30 or below 18.5, working with a dietitian on weight normalisation is one of the most impactful fertility interventions available.

A strategic fertility diet isn't about perfection — it's about optimising the nutritional environment for conception. Combined with appropriate supplementation, regular movement, and accurate cycle tracking, dietary intervention is one of the most powerful and accessible tools in your fertility toolkit.