What to Eat in the 90 Days Before Your Next IVF Cycle: A Mediterranean-Style Guide for Both Partners

Evidence-based · Written by Dr. Leila Fazlicic, D.Ac, L.Ac · All key claims cited to peer-reviewed research

The short answer: The best-studied way of eating before IVF is a Mediterranean-style pattern — vegetables, fruit, whole grains, legumes, fish, olive oil, and nuts, with less red and processed meat, less added sugar, and fewer ultra-processed foods. The roughly 90 days before your cycle is a shared biological window: her eggs complete their final maturation and his sperm are built from scratch in that same stretch. What both partners eat during those weeks is part of what you bring to the protocol — alongside, never instead of, your clinic's plan.

Below is the practical version: what to eat before IVF, why it maps onto the biology of the 90-day window, and how to build it as a couple.

If you're reading this at 2 a.m. after a cycle that didn't work, I want to say something before we talk about food: nothing you ate — or didn't eat — caused that outcome. IVF fails for reasons that are often invisible even to your care team, and no dietary pattern on earth guarantees a different result next time. What nutrition can do is more modest and more hopeful: it can shape the environment in which your next set of eggs matures and your partner's next generation of sperm is assembled. That environment is being built right now, whether or not anyone is paying attention to it. This guide is about paying attention to it — calmly, together, and with the evidence in view.

What to eat before IVF: the short version

When researchers study diet and fertility, the pattern that keeps surfacing is Mediterranean-style eating. Not a rigid meal plan — a pattern. Its core principles are simple:

• Mostly plants: vegetables and fruit at most meals, plus legumes (beans, lentils, chickpeas) several times a week
• Whole grains instead of refined ones: oats, brown rice, barley, whole-grain bread and pasta
• Fish and seafood as the featured animal proteins, roughly two to three times a week
• Extra-virgin olive oil as the main added fat, with nuts and seeds most days
• Less red and processed meat, and meals built around plants and fish rather than around meat
• Little added sugar and few ultra-processed foods — the packaged snacks, sweetened drinks, and refined convenience foods that quietly displace everything above

A comprehensive review by Gaskins and Chavarro at Harvard concluded that dietary patterns built on whole grains, vegetables, fish, and unsaturated fats — the Mediterranean template — are consistently associated with better fertility in women and better semen quality in men, while trans fats, added sugars, and heavy red and processed meat intake tend to sit on the unfavorable side of the ledger (Gaskins & Chavarro, 2018). Here is the whole guide compressed into one table:

Why do the 90 days before IVF matter for both partners?

This is the piece almost nobody explains in the consult room, and it changes how couples think about the weeks between cycles.

Her side of the window. The eggs retrieved in your next cycle are not created that month. The follicles that will respond to stimulation have been moving through their final growth phases for months beforehand — classic work on primate folliculogenesis shows the last stages of follicle development unfold over several months, with the final gonadotropin-sensitive stretch spanning the weeks directly before ovulation or retrieval (Gougeon, 1996). During that window, the egg sits inside follicular fluid whose composition — nutrients, glucose, antioxidants, B-vitamins — reflects, in part, what its owner has been eating. Diet doesn't change how many eggs you have; it may influence the environment in which the ones already queued up complete their maturation. I go deeper into this in how egg quality is shaped in the 90 days before retrieval.

His side of the window. Sperm are manufactured continuously, from scratch, in a production cycle that takes roughly 74 days from stem cell to mature sperm, plus transit time (Neto et al., 2016). That means the sperm sample used at your next retrieval will be built almost entirely inside this 90-day window — under whatever nutritional, oxidative, and metabolic conditions his body provides during those weeks. This is why male-side nutrition is not a courtesy gesture; it is a biologically distinct project running on the same timeline. If a previous cycle raised questions about sperm quality, the companion article on lowering sperm DNA fragmentation in 74 days covers that side in detail.

Two biological clocks, one calendar. That's the quiet logic of preparing together.

Does the Mediterranean diet improve IVF success?

Here is where I owe you precision instead of hype. The honest answer: the evidence is observational, consistent, and encouraging — and it cannot prove cause and effect.

The study that first put this on the map followed 161 couples through IVF/ICSI in Rotterdam. Couples with high adherence to a Mediterranean-style pattern — high in vegetable oils, vegetables, fish, and legumes, low in snack foods — had higher odds of achieving pregnancy (odds ratio 1.4), and the pattern tracked with higher B6 and folate levels in blood and in the follicular fluid surrounding the egg (Vujkovic et al., 2010). Notably, the diet score was measured for the couple — both partners.

The strongest single study in women came from Athens: 244 non-obese women undergoing a first IVF cycle were scored on Mediterranean diet adherence before treatment. Women in the lowest adherence tertile had clinical pregnancy rates of 29.1% versus 50.0% in the highest tertile, and live birth rates of 26.6% versus 48.8%. The association was concentrated in women under 35 and was not seen in women 35 and older (Karayiannis et al., 2018).

Why might the association weaken with age? Nobody knows for certain. It may be that age-related changes in egg biology become the dominant factor, or that a three-month dietary window is simply too short to move the needle against them. If you're over 35, I read this evidence as "diet still makes sense as foundation-building, with humbler expectations" — not "diet doesn't matter for you."

Why does Mediterranean-style eating map onto fertility biology?

Three mechanisms show up again and again in the literature, and they explain why this particular pattern — rather than any single superfood — keeps correlating with reproductive outcomes.

1. Insulin and blood sugar. The ovary listens to insulin. Chronically elevated insulin — driven by refined carbohydrates, sugary drinks, and the blood-sugar rollercoaster of ultra-processed eating — can disrupt ovulatory signaling and alter the hormonal environment of the growing follicle. Reviews of diet and female fertility consistently find that slower-release carbohydrates (whole grains, legumes) and lower glycemic load associate with better ovulatory function (Chiu et al., 2018). This is especially relevant if PCOS or insulin resistance is part of your picture — I've written separately about PCOS, insulin, and pre-IVF preparation.

2. Oxidative stress. Both eggs and sperm are exquisitely vulnerable to oxidative damage — sperm especially, because they carry little repair machinery and their membranes are rich in fragile polyunsaturated fats. A diet dense in vegetables, fruit, nuts, and olive oil supplies a steady stream of dietary antioxidants and polyphenols; a diet dense in ultra-processed food tends to increase oxidative load while crowding those protectors out (Salas-Huetos et al., 2017).

3. Inflammation. Low-grade chronic inflammation is increasingly implicated in implantation and early pregnancy biology. Mediterranean-style eating is one of the best-documented anti-inflammatory dietary patterns in all of nutrition science, while patterns heavy in processed meat, refined grains, and added sugar push in the opposite direction (Gaskins & Chavarro, 2018).

Notice what these three have in common: none is about a magic nutrient. They are about the background chemistry your gametes develop in, meal after meal, for weeks. That is why the pattern matters more than any individual food on the list.

What should she eat before egg retrieval?

Within the Mediterranean template, a few emphases have particular support on the female side:

Folate-rich foods, alongside your prescribed folic acid. Leafy greens, legumes, and citrus contribute dietary folate, and in the Rotterdam cohort, Mediterranean-pattern eating correlated with higher folate and B6 not just in blood but in follicular fluid — the egg's immediate bathwater (Vujkovic et al., 2010). Food complements, but does not replace, the supplement your clinic has prescribed.

Whole grains and slow carbohydrates. In the Harvard-affiliated EARTH cohort and related literature reviewed by Chiu and colleagues, higher whole-grain intake among women undergoing IVF was associated with higher probability of live birth, possibly through effects on the endometrium; refined carbohydrates and high glycemic load sat on the unfavorable side (Chiu et al., 2018).

Fish and omega-3 fats. The same review found seafood and omega-3 fatty acid intake generally associated with favorable fertility treatment outcomes. Choose lower-mercury options — salmon, sardines, trout — and follow your own clinician's guidance on species and frequency during treatment.

Full-fat versus low-fat dairy? The evidence here is genuinely mixed. Some ovulatory-infertility data favor full-fat dairy, but IVF-specific findings are inconsistent, and reviews stop short of a firm recommendation (Gaskins & Chavarro, 2018). My honest read: dairy is not a make-or-break decision. Pick the form you enjoy and spend your effort on vegetables, whole grains, and fish, where the signal is stronger.

One thing she should not do: restrict aggressively. The pre-IVF window is a terrible time for crash dieting. The follicle is an energy-hungry structure, and severe caloric restriction is its own stressor. This is about composition, not deprivation.

What should he eat in the 74 days before retrieval?

The male side of the table has, if anything, tidier evidence — because semen parameters are measurable in a way egg quality is not.

In the Athens cohort's male arm, 225 men from couples attending a fertility clinic were scored on Mediterranean diet adherence. Men in the lowest tertile were roughly two-and-a-half to three times more likely to have sperm concentration, total count, and motility below WHO reference values than men in the highest tertile — 47.4% versus 16.7% below reference for concentration, 65.8% versus 31.8% for total motility (Karayiannis et al., 2017). Cross-sectional, yes — but the direction agrees with a systematic review of observational studies, which concluded that diets rich in fish, vegetables, fruit, whole grains, and low-fat dairy consistently associate with better semen quality, while processed meat, sweets, and sugared drinks associate with worse (Salas-Huetos et al., 2017).

And on the male side we even have a randomized controlled trial. In the FERTINUTS trial, 119 healthy young men eating a Western-style diet were randomized to add 60 grams of mixed nuts daily (walnuts, almonds, hazelnuts) for 14 weeks — one full sperm production cycle. The nut group showed significant improvements in total sperm count, vitality, motility, and morphology, along with reduced sperm DNA fragmentation, compared with controls (Salas-Huetos et al., 2018). One trial in healthy men doesn't prove nuts fix subfertility — but it is rare, welcome experimental evidence that food choices can shift measurable sperm outcomes within a single 74-day build cycle.

A note that matters to many couples reading this after a failed cycle: a normal semen analysis does not close the book on male-side contribution. Standard parameters say little about DNA integrity inside the sperm head — a separate question I unpack in why a normal semen analysis can coexist with a failed cycle.

Here's how the same shopping list serves two different biological projects:

What does a realistic week of eating before IVF look like?

Patterns beat plans, so I'll give you rhythms rather than recipes. A week that quietly hits the Mediterranean template looks like this:

• Anchor breakfast once, repeat it. Oats with walnuts, berries, and yogurt — or eggs with vegetables and whole-grain toast. Decision-free mornings protect the rest of the day.
• Two fish dinners. Pick a day (say, Monday and Thursday) rather than an intention. Tinned sardines and frozen salmon count fully; nothing about this requires a fish market.
• Two legume dinners. Lentil soup, chickpea curry, a bean chili. These displace meat-centered meals without anyone announcing a dietary regime.
• A handful of nuts daily, for both of you. Put the jar somewhere visible. His 74-day project and her follicular window are both served by the same 30–60 grams.
• Vegetables at two meals a day, minimum. Frozen vegetables are nutritionally legitimate. Roast a tray twice a week and repurpose it.
• Olive oil as the default fat. One decision, made once, at the grocery store.
• One shared weekend meal that feels like pleasure, not protocol. Sustainability is a nutrient too. A pattern you can hold for 90 days beats a perfect week you abandon by day ten.

Notice that the two of you are eating from the same pot. That matters practically — one grocery list, one cooking effort — and it matters relationally. In the Rotterdam data, it was the couple's adherence that tracked with pregnancy odds (Vujkovic et al., 2010). Preparation this way is something you do together, not something one partner performs while the other watches.

What should you limit before IVF?

Sugar-sweetened drinks are the clearest single target. In a prospective study of 340 women undergoing IVF, sugared soda intake was associated with fewer total and mature oocytes retrieved, fewer top-quality embryos, and a 12–16 percentage point lower adjusted live birth rate compared with women who drank none — while coffee, caffeine, and diet sodas showed no such association (Machtinger et al., 2017). Outside the IVF context, a large preconception cohort found that both female and male sugar-sweetened beverage intake was associated with reduced fecundability — roughly 20–25% lower monthly conception probability at seven or more servings a week (Hatch et al., 2018). Observational again — but note that the male association existed independently. His soda habit is not neutral.

Trans and industrially hardened fats. In the Nurses' Health Study II, each 2% of energy from trans fat consumed in place of carbohydrate was associated with a 73% higher risk of ovulatory infertility (Chavarro et al., 2007). Trans fats are now heavily restricted in many countries, but they linger in some fried, packaged, and bakery products — one more reason the "fewer ultra-processed foods" principle does a lot of quiet work.

Processed meat. Repeatedly associated with poorer semen quality in the male literature (Salas-Huetos et al., 2017). It doesn't need to vanish; it needs to stop being a daily default.

Alcohol and caffeine deserve one honest sentence each: the IVF-specific evidence for moderate caffeine is largely reassuring, the alcohol evidence is mixed enough that many clinics advise minimizing it during treatment — and your own clinic's guidance on both supersedes anything written here.

What I'd ask you not to do is turn this list into a purity contest. One birthday cake in your 90 days will not undo the window. Chronic patterns are the exposure the studies measure; single meals are noise.

When is food not the whole answer?

Almost always, in some sense — and it's important to say so plainly. Diet is one input into a system with many. It cannot correct a blocked tube, dissolve a fibroid, resolve severe male-factor infertility, or turn back ovarian aging. The Athens data themselves showed no diet association in women over 35 — a finding I'd rather tell you about than hide (Karayiannis et al., 2018).

Food also can't substitute for diagnosis. If cycles keep failing without explanation, the productive questions are diagnostic ones — about embryo quality, implantation factors, sperm DNA integrity, endometrial receptivity — asked with your reproductive endocrinologist. Nutrition prepares the ground; it does not replace the investigation.

And a word for the partner reading this with a knot in their stomach: if food tracking is becoming a source of anxiety, guilt, or conflict, that cost is real and it counts. Stress does not need another supervisor. The goal of the 90-day window is a calmer, better-provisioned run-up to your cycle — not a second full-time job.

What we do with this

Here is the whole article in three moves. First, put a date on the calendar roughly 90 days before your expected cycle — that's the opening of the shared window, hers and his. Second, shift the household pattern, not one person's plate: vegetables and whole grains as the base, fish twice a week, legumes twice a week, nuts daily, olive oil by default, sugared drinks and ultra-processed food edged out rather than banned. Third, hold it loosely — the evidence supports a consistent pattern, not perfection, and none of it replaces the medical work-up your clinic is doing.

If you're trying to figure out where nutrition fits among everything else you could be doing before your next cycle — and what actually deserves your limited energy — that's exactly what I help couples sort out.

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References

1. Vujkovic M, de Vries JH, Lindemans J, Macklon NS, van der Spek PJ, Steegers EA, Steegers-Theunissen RP. The preconception Mediterranean dietary pattern in couples undergoing in vitro fertilization/intracytoplasmic sperm injection treatment increases the chance of pregnancy. Fertility and Sterility. 2010;94(6):2096–2101. https://pubmed.ncbi.nlm.nih.gov/20189169/
2. Karayiannis D, Kontogianni MD, Mendorou C, Mastrominas M, Yiannakouris N. Adherence to the Mediterranean diet and IVF success rate among non-obese women attempting fertility. Human Reproduction. 2018;33(3):494–502. https://pubmed.ncbi.nlm.nih.gov/29390148/
3. Karayiannis D, Kontogianni MD, Mendorou C, Douka L, Mastrominas M, Yiannakouris N. Association between adherence to the Mediterranean diet and semen quality parameters in male partners of couples attempting fertility. Human Reproduction. 2017;32(1):215–222. https://pubmed.ncbi.nlm.nih.gov/27994040/
4. Salas-Huetos A, Bulló M, Salas-Salvadó J. Dietary patterns, foods and nutrients in male fertility parameters and fecundability: a systematic review of observational studies. Human Reproduction Update. 2017;23(4):371–389. https://pubmed.ncbi.nlm.nih.gov/28333357/
5. Gaskins AJ, Chavarro JE. Diet and fertility: a review. American Journal of Obstetrics and Gynecology. 2018;218(4):379–389. https://pubmed.ncbi.nlm.nih.gov/28844822/
6. Chiu YH, Chavarro JE, Souter I. Diet and female fertility: doctor, what should I eat? Fertility and Sterility. 2018;110(4):560–569. https://pubmed.ncbi.nlm.nih.gov/30196938/
7. Salas-Huetos A, Moraleda R, Giardina S, Anton E, Blanco J, Salas-Salvadó J, Bulló M. Effect of nut consumption on semen quality and functionality in healthy men consuming a Western-style diet: a randomized controlled trial. American Journal of Clinical Nutrition. 2018;108(5):953–962. https://pubmed.ncbi.nlm.nih.gov/30475967/
8. Machtinger R, Gaskins AJ, Mansur A, Adir M, Racowsky C, Baccarelli AA, Hauser R, Chavarro JE. Association between preconception maternal beverage intake and in vitro fertilization outcomes. Fertility and Sterility. 2017;108(6):1026–1033. https://pubmed.ncbi.nlm.nih.gov/28985907/
9. Hatch EE, Wesselink AK, Hahn KA, Michiel JJ, Mikkelsen EM, Sorensen HT, Rothman KJ, Wise LA. Intake of sugar-sweetened beverages and fecundability in a North American preconception cohort. Epidemiology. 2018;29(3):369–378. https://pubmed.ncbi.nlm.nih.gov/29384791/
10. Chavarro JE, Rich-Edwards JW, Rosner BA, Willett WC. Dietary fatty acid intakes and the risk of ovulatory infertility. American Journal of Clinical Nutrition. 2007;85(1):231–237. https://pubmed.ncbi.nlm.nih.gov/17209201/
11. Neto FT, Bach PV, Najari BB, Li PS, Goldstein M. Spermatogenesis in humans and its affecting factors. Seminars in Cell & Developmental Biology. 2016;59:10–26. https://pubmed.ncbi.nlm.nih.gov/27143445/
12. Gougeon A. Regulation of ovarian follicular development in primates: facts and hypotheses. Endocrine Reviews. 1996;17(2):121–155. https://pubmed.ncbi.nlm.nih.gov/8706629/

Frequently Asked Questions

How long before IVF should you change your diet?

Around 90 days is the window most aligned with the biology: sperm take roughly 74 days to be built, and the follicles retrieved at IVF complete their final growth over the preceding months. Starting earlier is reasonable, and starting later is still worthwhile — observational studies cannot pinpoint a minimum effective window, so any consistent stretch of better eating before your cycle is a sensible investment.

Does the Mediterranean diet increase IVF success rates?

Observational studies have linked higher Mediterranean diet adherence to higher clinical pregnancy and live birth rates in some groups, particularly women under 35, but this is association rather than proven causation, and no randomized trial has confirmed a live birth benefit. It is a reasonable, low-risk pattern to adopt before IVF — as a foundation, not a guarantee.

Should both partners change their diet before IVF?

Ideally, yes. Sperm are rebuilt from scratch in roughly 74 days, and diet has been associated with sperm count, motility, morphology, and DNA fragmentation in observational studies and at least one randomized trial. In one couples-based IVF study, it was the pair's combined adherence to a Mediterranean pattern that tracked with pregnancy odds — preparation works best as a shared project.

This article is general education only — it is not medical or dietetic advice; please make all treatment and nutrition decisions with your own clinician.