Fertility & Food: Nutrition Changes That May Help You Conceive

Introduction

One in six couples worldwide struggles to conceive, according to the World Health Organization (2023), yet nutrition, one of the most modifiable factors in reproductive health, is rarely the first thing a GP brings up in a preconception appointment. That gap is closing fast as a growing body of research links specific dietary patterns to ovulation, egg quality, sperm motility, and implantation success.

This is not about miracle superfoods or punishing cleanses. It is about understanding how the food on your plate, day after day, creates the hormonal environment in which conception either flourishes or flounders.

By the end of this article you will understand:

1. Why What You Eat Affects Fertility More Than You Think

Food is information for your reproductive system, not just fuel. Every hormone your body makes, from estrogen to progesterone to the follicle-stimulating hormone (FSH) that triggers ovulation, is assembled from dietary raw materials. Fatty acids, amino acids, micronutrients, and phytochemicals all feed directly into the pathways that determine whether ovulation happens on schedule, whether an embryo implants successfully, and whether sperm are healthy enough to make the journey.

Diet quality in the preconception period is one of the most underutilised levers in reproductive medicine.

— Harvard T.H. Chan School of Public Health, The Nurses' Health Study II (2009)

The landmark Nurses' Health Study II, which followed more than 18,000 women over eight years, found that women who ate a diet high in plant proteins, full-fat dairy, low-glycaemic carbohydrates, and iron-rich foods had significantly lower rates of ovulatory infertility. This was not a small effect; the women in the top dietary tier had an 80 percent lower risk of ovulatory infertility than those in the lowest tier.

The three-month window

Eggs take roughly 90 days to mature from a dormant follicle to a fully developed oocyte ready for ovulation. Sperm take about 74 days to develop. That biology gives you a clear, actionable window: the three months before you start trying to conceive are the most impactful time to tighten up your nutrition.

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2. The Mediterranean Diet: The Most Evidence-Backed Pattern for Conception

If there is one dietary framework that fertility researchers keep returning to, it is the Mediterranean diet, and the evidence is remarkably consistent across populations, fertility treatments, and both sexes.

A 2018 study published in Human Reproduction (Karayiannis et al.) followed 244 women undergoing IVF in Greece. Women who adhered closely to a Mediterranean diet had a 65–68 percent higher probability of achieving a clinical pregnancy and live birth compared with women with the lowest adherence. The same dietary pattern has been linked to better sperm concentration and motility in men.

What a Mediterranean fertility plate looks like

The Mediterranean diet is not a strict protocol with forbidden foods; it is a proportional way of eating.

3. The Nutrients That Matter Most, and Where to Find Them

Beyond overall dietary patterns, certain micronutrients play starring roles in reproductive biology. Deficiencies in several of these are common in reproductive-age adults even in high-income countries.

Folate (not just folic acid)

Folate is essential for DNA synthesis and cell division; two processes that happen at extraordinary speed in a newly fertilised embryo. The CDC recommends 400 mcg of folic acid daily for anyone who could become pregnant, starting at least one month before conception. Whole-food sources of folate (the natural form) include dark leafy greens, lentils, asparagus, avocado, and edamame.

Women who took folic acid supplements before and during early pregnancy had a 40 percent lower risk of neural tube defects in their babies.

— CDC, Morbidity and Mortality Weekly Report (2015)

The synthetic supplement form, folic acid, is well-studied for preventing neural tube defects, but some people carry a genetic variant (MTHFR) that reduces their ability to convert folic acid to its active form. If you have this variant, look for supplements labelled "methylfolate" or "5-MTHF" rather than plain folic acid.

Omega-3 fatty acids (DHA and EPA)

Omega-3s, particularly DHA and EPA found in fatty fish and algae-based supplements, support egg quality, reduce uterine inflammation, and are critical for embryonic brain development. Research published in the American Journal of Obstetrics and Gynecology (2019) found that women with higher omega-3 levels had more mature eggs retrieved during IVF cycles.

Iron

The Nurses' Health Study II found that women who consumed more non-haem iron (from plants and supplements) had lower rates of ovulatory infertility. Good plant sources include lentils, tofu, pumpkin seeds, fortified cereals, and spinach. Pair them with a vitamin C-rich food to enhance absorption. Aim for around 27 mg daily when trying to conceive.

Vitamin D

Vitamin D receptors exist in ovarian tissue, the endometrium, and sperm cells. Low levels are associated with poorer IVF outcomes and irregular ovulation. The Royal College of Obstetricians and Gynaecologists (RCOG) recommends that all women planning a pregnancy take a daily supplement of at least 10 mcg (400 IU) of vitamin D, with many fertility specialists recommending 1,000–2,000 IU based on blood levels.

Iodine

Iodine is essential for thyroid function, and thyroid disorders are one of the most common hormonal barriers to conception. The NHS recommends 150 mcg of iodine daily for adults; dairy products, seafood, and eggs are primary sources, while iodised salt and seaweed can supplement intake for plant-based eaters.

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4. What to Limit or Avoid When Trying to Conceive

The fertility research on foods to avoid is, if anything, more consistent than the research on foods to add. Certain dietary patterns reliably worsen ovarian function, disrupt hormonal signalling, and damage sperm DNA.

Trans fats: the clearest dietary villain

Trans fats, still found in some commercially fried foods, stick margarines, and partially hydrogenated vegetable oils, are about as harmful as any single dietary component can be for fertility. The Nurses' Health Study II found that for every 2 percent increase in energy from trans fats (replacing monounsaturated fats), the risk of ovulatory infertility rose by 73 percent. Read labels; look for "partially hydrogenated oil" in the ingredients list and avoid it.

Ultra-processed foods and refined carbohydrates

High glycaemic diets spike blood sugar and insulin repeatedly throughout the day. Chronically elevated insulin disrupts LH and FSH signalling, increases androgen production (worsening PCOS symptoms in susceptible women), and impairs ovulation. A 2018 study in Epidemiology found that women in the highest quartile of ultra-processed food intake had a 16 percent higher risk of infertility.

Alcohol

There is no established safe level of alcohol during the conception window or early pregnancy. Research consistently shows that even moderate alcohol consumption (3–6 drinks per week) is associated with reduced fecundity (the probability of conceiving per cycle) in women and with lower testosterone and sperm quality in men. The safest approach is to treat the three-month preconception window as alcohol-free.

High-mercury fish

Fatty fish is beneficial for fertility, but high-mercury species (shark, swordfish, king mackerel, tilefish, and bigeye tuna) can accumulate mercury that damages both eggs and developing neural tissue. The FDA recommends that women who are pregnant or trying to conceive consume no more than two to three servings per week of low-mercury seafood and avoid high-mercury species entirely.

Understanding how daily routines support or sabotage your health goals is just as important as knowing which foods to choose. Practical family health routines can make it far easier to build sustainable preconception habits rather than relying on willpower alone.

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5. Male Fertility and Nutrition: The Overlooked Half of the Equation

Male factor infertility contributes to roughly 40–50 percent of all cases of infertility, according to the American Urological Association, yet nutrition conversations almost always focus exclusively on the person who will carry the pregnancy. This is a significant gap in preconception care.

Sperm quality, specifically concentration, motility, and DNA integrity, responds meaningfully to dietary changes over the 74-day sperm development cycle. The research on male fertility nutrition is growing rapidly.

Antioxidants are the priority for sperm health

Sperm DNA is particularly vulnerable to oxidative damage. A diet high in antioxidants, including vitamins C and E, selenium, zinc, lycopene, and coenzyme Q10 (CoQ10), helps neutralise free radicals before they degrade sperm DNA.

What men should avoid

The same dietary villains that harm female fertility also damage sperm: trans fats, excessive alcohol, ultra-processed foods, and high sugar intakes all correlate with lower sperm counts and higher DNA fragmentation rates. Soy isoflavones in extremely high doses (think multiple daily soy protein shakes) have shown associations with lower sperm concentrations in some, but not all, studies; moderate soy food consumption appears safe.

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6. Special Considerations: PCOS, Endometriosis, and Plant-Based Diets

Not every fertility journey starts from the same place. Three common scenarios warrant tailored nutritional approaches.

Polycystic ovary syndrome (PCOS)

PCOS is the most common hormonal disorder in reproductive-age women, affecting roughly 1 in 10, and it is the leading cause of ovulatory infertility. Insulin resistance drives much of the hormonal disruption in PCOS, so a low-glycaemic, anti-inflammatory diet is particularly beneficial.

Endometriosis

Endometriosis is driven partly by systemic inflammation, so an anti-inflammatory dietary approach is logical. Research from a 2013 Italian study (Marziali et al., published in Fertility and Sterility) found that a gluten-free diet reduced pain scores in a small group of women with endometriosis, though larger studies are still needed. More consistently, diets high in omega-3s and low in red meat and trans fats are associated with reduced risk.

Plant-based and vegan diets

A well-planned plant-based diet can absolutely support fertility, but a few specific nutrients need attention.

Just as the fourth-trimester period benefits from structured, evidence-based planning, evidence-based preconception nutrition is far more effective when you approach it with a framework rather than a list of rules.

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Expert Insights

Conclusion

Conception is one of the most biologically intricate things the human body does, and yet the food choices you make every single day speak directly to the hormones, cells, and DNA involved. The good news buried in all the research is that you are not powerless here. You do not need a perfect diet; you need a consistently better one, built around whole foods, healthy fats, plant proteins, and the micronutrients your reproductive system is quietly waiting for.

Start with one or two changes this week: swap your cooking oil, add a serving of leafy greens, take a prenatal vitamin, cook fatty fish for dinner. Small, sustainable shifts compounded over the 90-day preconception window can genuinely change your odds.

The body preparing to create a new life deserves to be fed like the extraordinary system it is. Save this article, share it with your partner, and let the kitchen be your first act of preconception care.