What to Eat During IVF: Foods That Support Each Stage

A Mediterranean-style eating pattern, rich in vegetables, whole grains, fish, and olive oil, is the single most studied dietary approach in IVF research, and it is consistently linked to better outcomes. One landmark study found that women under 35 with the highest adherence to this diet were roughly 2.7 times more likely to achieve a clinical pregnancy and live birth than those with the lowest adherence.¹ But the value of nutrition during IVF goes beyond any single diet label. Specific nutrients play distinct roles at different stages of the process, from the months of preparation before a cycle begins to the days surrounding embryo transfer.

Why the Mediterranean Diet Keeps Showing Up in IVF Research

The Mediterranean diet is not a rigid meal plan. It is a broad pattern built around fruits, vegetables, legumes, whole grains, nuts, olive oil, and fish, with moderate dairy and low intake of red meat, processed food, and sugar. Researchers studying IVF outcomes have gravitated toward it because it bundles together many nutrients thought to matter for reproduction: anti-inflammatory fats, antioxidants, fiber, and micronutrients like folate and iron.

In a Greek study of 244 non-obese women undergoing their first IVF cycle, those in the top third of Mediterranean diet adherence had a clinical pregnancy rate of 50%, compared with 29% among those in the bottom third. The live birth rate followed the same pattern: about 49% versus 27%.² A literature review of multiple studies reinforced this, reporting that higher Mediterranean diet scores were associated with nearly double the clinical pregnancy rate and more than double the live birth rate among women under 35.³ One proposed mechanism is that these foods collectively reduce chronic inflammation, which can interfere with regular ovulation, implantation, and other reproductive processes.⁴

An important caveat: most of the strong associations in these studies were seen in women under 35. The Greek study found no significant link between diet score and outcomes in women 35 and older. That does not mean nutrition is irrelevant past 35, but it suggests the diet’s influence on egg quality and implantation may be more easily measurable when age-related decline has not yet become the dominant factor.

Foods That Support Egg Quality Before and During Stimulation

The weeks and months before your IVF cycle begins are when your eggs are maturing. This is the window where nutrition can plausibly influence oocyte quality and the ovarian response to stimulation drugs.

Fish stands out among protein sources. A study tracking women through IVF found that those who ate the most fish had a live birth probability of about 48%, compared with 34% for those who ate the least. When researchers modeled the effect of swapping two servings of other meat per week for fish, the odds of live birth increased by more than 50%.⁵ Fish provides omega-3 fatty acids, high-quality protein, and vitamin D, all of which appear independently in the fertility research.

Coenzyme Q10, or CoQ10, is a molecule your cells use to produce energy. It naturally declines with age, and research in both animal and human models suggests this decline contributes to poorer egg quality. In a mouse study, administering CoQ10 reversed age-related declines in oocyte quality and even prevented premature ovarian failure in animals with genetically impaired CoQ10 production.⁶ A randomized controlled trial in young women with diminished ovarian reserve found that CoQ10 supplementation before stimulation increased the number of eggs retrieved, improved fertilization rates, and produced more high-quality embryos.⁷ CoQ10 is found in organ meats, sardines, and peanuts, but most people looking for a meaningful dose use a supplement. If you are considering it, discuss timing and dosage with your fertility specialist, since most trials begin supplementation at least 60 days before stimulation starts.

Omega-3 Fats and Embryo Development

Omega-3 fatty acids deserve their own mention beyond the fish discussion because the research on them and IVF is both promising and somewhat messy. A systematic review of five studies concluded that omega-3 intake appeared beneficial for embryo quality and positive treatment outcomes.⁸ A separate prospective study found that higher total omega-3 intake, particularly from plant-based alpha-linolenic acid and the marine-derived DHA, was linked to improved embryo shape and quality.⁹

However, one study measuring the omega-3 index in blood found no correlation between that index and IVF outcomes.¹⁰ This kind of inconsistency is common in nutrition research, where the way a nutrient is measured (dietary intake questionnaires versus blood levels), the population studied, and the specific outcomes tracked all influence results. The overall weight of evidence leans positive, but the effect size is uncertain. Practical takeaway: eating fatty fish, walnuts, flaxseed, and other omega-3 sources regularly in the months before your cycle aligns with both the fish data and the broader Mediterranean diet findings. Mega-dosing with fish oil supplements is a different question, and the evidence is not strong enough to recommend high-dose supplementation specifically for IVF.

Building the Uterine Lining

A thick, well-vascularized endometrium is critical for embryo implantation. Some women struggle with thin linings, and certain nutrients have been studied as ways to improve uterine blood flow and endometrial growth.

Vitamin E improved blood flow to the uterus in about 72% of patients and increased endometrial thickness in roughly half of them in a pilot study of women with thin linings.¹¹ Vitamin E is an antioxidant that supports blood vessel function, and rich dietary sources include almonds, sunflower seeds, avocados, and olive oil.

L-arginine, an amino acid the body uses to make nitric oxide (a molecule that relaxes blood vessels), showed even stronger results in the same study, improving uterine blood flow in about 89% of patients. A clinical trial focused specifically on women with recurrent implantation failure found that L-arginine supplementation significantly reduced uterine artery resistance and improved both chemical and clinical pregnancy rates compared to controls.¹² L-arginine is found in turkey, pork, chicken, pumpkin seeds, soybeans, and peanuts. Whether dietary amounts are enough to replicate the effects seen in supplement trials is unknown, but including these foods regularly is unlikely to hurt and may help.

Iron, Vitamin D, and Folate

These three micronutrients come up in almost every IVF nutrition conversation, but the details matter more than the headlines.

Iron

Iron deficiency appears to directly impair embryo development. In one study, iron-deficient women had dramatically lower fertilization rates and far fewer excellent-quality embryos compared to women with normal iron levels: about 24% excellent embryos versus 62%.¹³ The timing of supplementation mattered too. Women who received iron immediately before starting stimulation drugs saw little improvement, but those who supplemented and then waited about two months before beginning stimulation restored their embryo quality to levels comparable to non-deficient women. Iron may also influence endometrial receptivity and oocyte quality through its presence in developing follicles.¹⁴ The practical point: get your iron levels checked well before your cycle, not during it. If you are deficient, you need time to replete.

Vitamin D

Vitamin D status has been linked to IVF success in some studies but not others. One study measuring vitamin D levels in follicular fluid found that each additional unit of vitamin D independently increased the chance of clinical pregnancy by about 6%, after controlling for age and other factors.¹⁵ However, another study found no significant correlation between follicular or serum vitamin D levels and pregnancy rates.¹⁶ The conflicting results likely reflect differences in the populations studied and baseline vitamin D levels. What most fertility specialists agree on is that correcting a deficiency is worthwhile. Ask your clinic to test your levels and supplement if you are low, particularly if you live in a northern climate or have limited sun exposure.

Folate Form

Nearly everyone going through IVF knows they should take folate. What fewer people know is that the form of folate may matter. Standard folic acid needs to be converted into its active form (5-methyltetrahydrofolate, or 5-MTHF) by an enzyme called MTHFR. A significant portion of the population carries gene variants that make this conversion less efficient. For these individuals, a case series found that switching to 5-MTHF at a standard dose bypassed the genetic bottleneck and was associated with successful pregnancies after previously failed cycles.¹⁷

A mouse study added another concern about high-dose folic acid specifically. At doses well above the standard recommendation, folic acid impaired egg maturation, fertilization, and embryo development, and increased embryo reabsorption. The same high doses of 5-MTHF did not cause these problems and even improved some outcomes. The folic acid group also showed elevated levels of formaldehyde, a toxic byproduct, while 5-MTHF actually lowered it.¹⁸ This is animal data, and the doses were far above what humans typically take, so it does not mean standard-dose folic acid is dangerous. But if you are taking a prenatal vitamin, choosing one that contains methylfolate rather than plain folic acid is a reasonable precaution, especially if you do not know your MTHFR status.

Fiber and the Gut-Uterus Connection

This is a newer and more surprising area of research. Dietary fiber gets fermented by gut bacteria into short-chain fatty acids, particularly butyrate. An animal study found that a specific fiber component called polygalacturonic acid (found in fruits like apples and citrus) promoted embryo implantation by increasing gut microbial diversity and butyrate production. Butyrate, in turn, drove the expansion of regulatory immune cells in the uterus, creating a more receptive environment for an embryo.¹⁹

This is early-stage research, and no one has yet proven that eating more fiber directly improves human IVF implantation rates. But it fits into a broader emerging picture where gut health influences reproductive immunity. Practically, eating a variety of fiber-rich foods like fruits, vegetables, beans, and whole grains has no downside and aligns with the same Mediterranean pattern that shows up in the broader IVF nutrition data. Apples, citrus fruits, and berries are particularly rich in the pectin-type fibers studied here.

What Your Partner Eats

IVF nutrition advice tends to focus almost exclusively on the person carrying the pregnancy, but sperm quality matters too, and diet influences it measurably. A case-control study comparing dietary patterns and sperm DNA fragmentation found that men eating a plant-and-fish-heavy pattern had about 61% lower odds of high DNA fragmentation compared to those eating the least of that pattern. Conversely, men eating a semi-Western or ultra-processed diet had roughly three to four times higher odds of damaged sperm DNA.²⁰ DNA fragmentation in sperm is linked to lower fertilization rates, poorer embryo development, and higher miscarriage risk.

Animal research on alcohol adds another dimension: paternal ethanol consumption caused epigenetic changes and DNA damage in sperm that led to developmental problems in offspring, including testicular changes in the next generation.²¹ For couples going through IVF, the partner’s diet in the months before the cycle is worth taking seriously. The same general advice applies: more fish, vegetables, and whole foods; less processed meat, fast food, and alcohol.

Caffeine and Alcohol During IVF

Caffeine is one of the first things people worry about when starting IVF, and the evidence is more reassuring than most expect. A dose-response meta-analysis found no significant association between caffeine consumption and either pregnancy rates or live birth rates for women or men undergoing IVF.²² An Italian cohort study confirmed this, finding no link between moderate caffeine intake and treatment outcomes.²³

One older study did report a link between even small amounts of caffeine and reduced live birth rates, but the intake levels were very low (as little as a few milligrams per day), and the study has not been consistently replicated.²⁴ Most clinics advise keeping caffeine under about 200 milligrams per day, roughly one to two cups of coffee, and the pooled evidence supports that moderate consumption is not a meaningful risk factor.

Alcohol is a different story. A study of over 2,500 IVF cycles found that women who drank four or more drinks per week had a 16% lower likelihood of live birth. Both women and men drinking at that level had about 48% greater odds of failed fertilization.²⁵ Another study focused on the timing and found that increasing alcohol by roughly one glass of wine per day in the month before an IVF attempt was associated with a significantly higher risk of not achieving pregnancy.²⁶ The month leading up to the cycle and the period before retrieval appear to be particularly sensitive windows. Most fertility clinics now recommend eliminating or sharply reducing alcohol during the IVF cycle and ideally in the month or two before it begins.

Pesticides and Choosing Produce

Some patients wonder whether they need to eat exclusively organic during IVF. Pesticides are endocrine disruptors, and a review of their effects on female fertility concluded that existing evidence suggests exposure may have an adverse impact, though the data remain limited overall.²⁷ The honest assessment is that no study has specifically shown that switching to organic produce improves IVF success rates. The concern is more about general endocrine-disrupting chemical exposure from multiple sources, including plastics, cosmetics, and food packaging, not just the residue on a strawberry.

A sensible middle ground: wash your produce thoroughly, prioritize organic for items you eat frequently and that tend to carry higher residue levels, and focus on eating plenty of fruits and vegetables rather than avoiding them out of pesticide anxiety. The benefits of a produce-rich diet for IVF outcomes are well-documented. The theoretical harm from trace pesticide residues on conventional produce is not. Skipping vegetables because you cannot afford organic would be counterproductive.

The Weight-Loss Question

Many women with higher body weight are told to lose weight before IVF, and it feels intuitive that this would help. But a meta-analysis of studies comparing intensive weight-loss programs before IVF to proceeding directly to treatment found that even significant weight loss (averaging about 4.6 kilograms) did not improve live birth rates, clinical pregnancy rates, or ongoing pregnancy rates.²⁸ This does not mean weight is irrelevant to fertility in general, but it does suggest that delaying IVF for the sake of a weight-loss program may not be beneficial, especially as age is a powerful factor in IVF success. The dietary quality changes that come with healthy eating are likely more important than the number on the scale.