What is the best fertility diet?

What is the best fertility diet?

This is one of the most common questions in the fertility space, and the honest answer is that there is no single perfect fertility diet that works the same way for every woman. What the research does show, clearly and consistently, is that certain dietary patterns create a far more fertile internal environment than others, and that the foods you choose before conception directly influence your hormones, egg quality, implantation, and the health of a developing pregnancy.

The good news is that the principles of a fertility-supportive diet are not restrictive, complicated, or joyless. They are built around real, nourishing food that tastes good and works with your body.

The Mediterranean diet is the most evidence-backed starting point

Of all the dietary patterns studied in reproductive science, the Mediterranean diet has the most consistent and compelling evidence behind it for fertility. It is characterised by a high intake of vegetables, fruits, legumes, whole grains, oily fish, nuts, seeds, and extra virgin olive oil, with moderate intake of poultry and dairy, and a low intake of red meat and processed foods.

A 2024 narrative review of seven observational studies involving 2,321 women undergoing assisted reproductive technology found that higher adherence to the Mediterranean diet was associated with improved clinical pregnancy rates and live birth rates. Three of the studies found that higher Mediterranean diet scores were associated with improved clinical pregnancy rates and live birth rates, with one study reporting a live birth rate ratio of 2.64 in favour of high adherence. A separate prospective study demonstrated that a Mediterranean-style dietary pattern was positively associated with folate and vitamin B6 levels in the blood and follicular fluid, with a 40% increase in pregnancy rate after IVF treatment.

Scientific evidence also suggests that adherence to a healthy Mediterranean-style diet is associated with increased fertility in women and improved semen quality in men, better metabolic health, reduced levels of inflammation and oxidative stress, and maintenance of a healthy body weight, all of which are fundamental to conception.

It is worth noting that not every study finds significant effects, and results across the research are mixed for ART-specific outcomes. What the overall body of evidence does support, clearly and repeatedly, is that a whole-food, anti-inflammatory dietary pattern built around Mediterranean principles creates a more fertile biological environment than its Western counterpart.

Why the Western diet actively works against fertility

The Western diet, which dominates in many parts of the world including Australia, is characterised by high intakes of ultra-processed foods, refined carbohydrates, sugar-sweetened beverages, trans fats, red and processed meat, and low intake of vegetables, fibre, and healthy fats. The research is unambiguous on this point. A diet high in trans fats, refined carbohydrates, and added sugars negatively affects fertility by disrupting hormonal balance, increasing insulin resistance, and driving chronic inflammation, all of which interfere with ovulation, egg quality, and implantation.

Multiple studies from the National Health and Nutrition Examination Survey, conducted across 2013 to 2020, found that a high dietary inflammatory index was associated with significantly increased risk of female infertility. In other words, a diet that drives inflammation is a diet that drives infertility.

The key principles of a fertility-supportive diet

Rather than following a rigid plan, the most effective approach is to build your diet around the following evidence-based principles:

Prioritise healthy fats, especially omega-3s. Polyunsaturated fats, particularly DHA and EPA from oily fish, support hormone regulation, ovarian follicle development, and embryo implantation. A 2024 meta-analysis of eleven studies found that omega-3 intake, through supplementation or fish consumption, was associated with improved pregnancy and fertility rates, including in women undergoing fertility treatments. Extra virgin olive oil and avocado, rich in monounsaturated fats, are equally important and form the cornerstone of the Mediterranean approach. Trans fats, found in processed and fried foods, should be minimised or eliminated entirely.

Choose plant-based protein over animal protein, most of the time. Research from the Harvard Nurses Health Study, one of the largest and most respected cohort studies ever conducted, found that women who favoured plant-based proteins over animal proteins had a significantly lower risk of ovulatory disorder infertility. Legumes, lentils, chickpeas, tofu, tempeh, nuts, and seeds are all excellent sources that also deliver fibre, antioxidants, and key micronutrients.

Eat a wide variety of vegetables and fruits daily. Colourful plant foods deliver the antioxidants your eggs, reproductive hormones, and uterine lining need to function well. Leafy greens in particular are rich in folate, iron, and magnesium, all of which are foundational to fertility. Aim for variety across the colour spectrum to capture the widest range of protective compounds.

Choose whole grains over refined carbohydrates. Blood sugar stability is one of the most underappreciated pillars of hormonal health and fertility. Whole grains, including oats, quinoa, brown rice, barley, and legumes, release energy slowly and support consistent blood sugar and insulin levels throughout the day. Refined carbohydrates and sugar-sweetened foods drive insulin spikes that disrupt hormonal signalling and impair ovulation.

Include oily fish two to three times per week. Salmon, sardines, mackerel, and anchovies are among the richest dietary sources of omega-3 fatty acids as well as iodine, selenium, and vitamin D, all nutrients that are particularly important for thyroid function, egg quality, and fetal development. For women avoiding fish, a high-quality algae-derived omega-3 supplement provides an effective alternative.

Support your gut microbiome. A diverse, plant-rich diet naturally feeds the beneficial bacteria in your gut, which in turn supports hormone metabolism, immune regulation, and nutrient absorption. Fermented foods such as yoghurt, kefir, sauerkraut, kimchi, and miso contribute additional beneficial bacteria and support microbiome diversity.

What to reduce or avoid

Ultra-processed foods, refined sugar, sugar-sweetened beverages, alcohol, trans fats, and high intakes of red and processed meat are consistently associated with poorer fertility outcomes in the research. Endocrine-disrupting chemicals found in plastics, pesticides, and some food packaging materials also deserve attention, as they interfere with hormonal signalling in ways that directly affect reproductive health. Choosing organic produce where possible, storing food in glass or stainless steel rather than plastic, and avoiding heating food in plastic containers are practical steps that reduce your exposure.

No single diet fits every woman

While the Mediterranean dietary pattern provides the best evidence-based framework, the most effective fertility diet is always one that is personalised to your individual biology. Your specific nutrient deficiencies, health history, hormonal profile, gut health, and any underlying conditions such as PCOS, endometriosis, thyroid dysfunction, or insulin resistance all shape what your body needs most. A woman with PCOS, for example, may benefit from a lower-carbohydrate, higher-protein approach within the Mediterranean framework, while a woman with a thin uterine lining may need targeted support for vascularisation and micronutrient density that goes beyond dietary pattern alone.

Precision nutrition, where your dietary recommendations are guided by your actual bloodwork, functional testing results, and personal health history, consistently produces better outcomes than any off-the-shelf fertility eating plan. This is what a personalised consultation with a fertility nutritionist provides that no book, app, or generic advice can replicate.

The bottom line

The best fertility diet is a whole-food, anti-inflammatory, nutrient-dense way of eating built around the principles of the Mediterranean dietary pattern. It is rich in colourful vegetables and fruits, whole grains, legumes, oily fish, healthy fats, and quality protein, and it minimises processed foods, refined sugar, trans fats, and alcohol. It supports hormonal balance, egg quality, ovulation, implantation, and a healthy pregnancy environment. And when tailored to your unique biology and needs, it becomes one of the most powerful tools available to you on your fertility journey.

Sources: MDPI Nutrients 2024 (Mediterranean diet and ART outcomes); PMC Biology 2024 (dietary patterns and fertility); PubMed Nutrition Reviews 2023 (Mediterranean diet and infertility meta-analysis); American Journal of Obstetrics and Gynecology 2023 (Mediterranean diet and female reproductive health, systematic review and meta-analysis); Frontiers in Nutrition 2024 (Mediterranean diet and seminal quality); Lancet Regional Health Western Pacific 2025 (women's health and female fertility); Illume Fertility 2024; Harvard Nurses Health Study; Frontiers in Nutrition 2025 (diet, female fertility and inflammatory pathways).