The relationship between diet and fertility is one of the most actively researched areas in reproductive medicine — and also one of the most distorted by wellness marketing. This guide separates what the evidence actually shows from the noise, covering the dietary patterns, specific nutrients, and foods that have meaningful data behind them.
What the Research Actually Shows
The most comprehensive data comes from the Nurses' Health Study, a long-running Harvard cohort study that followed thousands of women over time. Chavarro and colleagues published landmark analyses showing that dietary patterns — not just individual nutrients — were associated with ovulatory fertility. Women who followed what the researchers called a "fertility diet" had significantly lower rates of ovulatory infertility.
The fertility diet pattern identified in the Nurses' Health Study emphasized:
- Higher intake of plant protein over animal protein
- Full-fat dairy over low-fat dairy (a counterintuitive finding)
- Low-glycemic carbohydrates over refined carbohydrates
- Iron from plant sources
- Higher intake of monounsaturated fats over trans fats
The American Society for Reproductive Medicine (ASRM) notes in its nutrition and reproduction guidelines that while no single food will make or break fertility, overall dietary quality is a modifiable factor worth addressing.
The Mediterranean Diet and Fertility
The Mediterranean dietary pattern — high in vegetables, fruits, whole grains, legumes, fish, and olive oil, with moderate wine and limited red meat — has the strongest and most consistent research base for fertility.
A 2018 prospective cohort study of women undergoing IVF found that those with higher adherence to a Mediterranean-style diet in the six months before treatment had significantly higher rates of clinical pregnancy and live birth. The effect was most pronounced in women under 35.
The PREDIMED trial, the landmark Mediterranean diet cardiovascular study, also captured fertility-adjacent outcomes related to inflammation and insulin sensitivity — both key drivers of ovulatory function. The anti-inflammatory and insulin-sensitizing properties of the Mediterranean diet are thought to be primary mechanisms by which it supports reproductive health.
Core elements of the Mediterranean fertility diet:
- Olive oil as the primary fat source
- At least 5 servings of vegetables and fruit daily
- 3+ servings of legumes per week
- Fish (non-high-mercury varieties) 2-3 times per week
- Whole grains over refined grains
- Nuts and seeds as snacks
- Limited processed foods, added sugar, and red meat
Key Fertility Nutrients
Folate (Folic Acid)
Folate is the most evidence-backed nutrient in reproductive medicine. The NIH recommends 400-800 mcg of folic acid daily starting at least one month before attempting conception. The primary role is neural tube defect prevention, but emerging research also links adequate folate status to better oocyte quality and methylation capacity.
Natural food sources: dark leafy greens (spinach, romaine, arugula), lentils, black beans, asparagus, Brussels sprouts, avocado.
The MTHFR gene variant affects roughly 40% of the population and impairs conversion of folic acid to the active form (5-MTHF). Those with this variant may benefit from methylfolate supplements rather than standard folic acid.
CoQ10 (Coenzyme Q10)
CoQ10 is a cellular energy compound concentrated in mitochondria — which are especially critical in eggs and sperm. Mitochondrial function declines with age, and CoQ10 levels fall as well. Supplementing CoQ10 has been shown in several trials to improve egg quality markers in women with diminished ovarian reserve, though large randomized controlled trial data is still limited.
Food sources of CoQ10 include organ meats (liver, heart), fatty fish (mackerel, sardines), beef, and peanuts — though food sources provide only modest amounts compared to supplements.
Omega-3 Fatty Acids
Omega-3s — particularly EPA and DHA — have anti-inflammatory effects and play a role in oocyte membrane quality and embryo development. Research links adequate omega-3 intake to better IVF outcomes, including higher fertilization rates and embryo quality.
Best food sources: wild salmon, sardines, mackerel, anchovies, herring, walnuts, flaxseeds, chia seeds.
Note: avoid high-mercury fish (tuna steak, swordfish, shark, king mackerel) when trying to conceive, as mercury accumulates in reproductive tissue.
Vitamin D
Vitamin D deficiency is extraordinarily common — estimates suggest 40-50% of reproductive-age adults are insufficient. Vitamin D receptors are present in ovarian follicles and endometrial tissue, and observational studies consistently link adequate vitamin D levels to better IVF outcomes.
The relationship is likely bidirectional: vitamin D supports immune tolerance (relevant to implantation) and insulin sensitivity (relevant to PCOS). Getting levels checked before IVF is worth discussing with your doctor; the target is typically 40-60 ng/mL.
Food sources: fatty fish, egg yolks, fortified dairy, mushrooms exposed to UV light. Supplementation (1,000-2,000 IU/day) is often needed in regions with limited sun exposure.
Zinc
Zinc is essential for DNA synthesis, cell division, and hormone regulation. Deficiency is associated with irregular menstrual cycles and impaired egg maturation. Zinc is also critical for male fertility — it is highly concentrated in seminal fluid and supports testosterone synthesis and sperm motility.
Food sources: oysters (highest known food source), beef, pumpkin seeds, lentils, chickpeas, cashews.
Selenium
Selenium is an antioxidant mineral that protects eggs and sperm from oxidative damage. The thyroid — which regulates metabolism and reproductive hormones — requires selenium for proper function, and subclinical thyroid dysfunction is a known contributor to fertility challenges.
Food sources: Brazil nuts (one to two per day provides the recommended daily amount), tuna, sardines, eggs, sunflower seeds.
Taking Charge of Your Fertility Journey
Optimizing your fertility diet is one of the most empowering steps you can take while trying to conceive.
Before or alongside clinical treatment, many people explore at-home insemination. MakeAMom makes reusable at-home insemination kits — the CryoBaby for frozen or low-volume sperm, the Impregnator for low-motility sperm, and the BabyMaker for those with sensitivities — all designed for home use without a clinic visit.
Explore home insemination kits at MakeAMom →
Foods to Limit or Avoid
Trans Fats
Trans fats (partially hydrogenated oils) are among the most harmful dietary factors for ovulatory fertility. The Nurses' Health Study found that even small increases in trans fat intake were associated with significantly higher risk of ovulatory infertility. Trans fats increase systemic inflammation and insulin resistance — both damaging to reproductive function.
Trans fats are largely banned from the US food supply now, but still appear in some processed snack foods, stick margarines, and imported products. Check labels for "partially hydrogenated oil."
Processed Meats
High intake of processed red meat (bacon, sausage, deli meats, hot dogs) is associated with lower fertility in both men and women. Mechanistically, processed meats are high in saturated fat, sodium, and nitrites — and may disrupt insulin signaling. The Nurses' Health Study found women with high processed meat intake had higher rates of ovulatory infertility.
Refined Carbohydrates and Added Sugar
High glycemic load diets spike blood sugar and insulin, which stimulates ovarian androgen production — a direct disruptor of ovulation. Refined carbohydrates (white bread, white rice, sugary beverages, pastries) raise glycemic load far more than whole food carbohydrates.
The effect is most pronounced in women with PCOS, who already have insulin resistance. Even in women without PCOS, chronic high glycemic eating can disrupt the insulin-LH axis.
High-Mercury Fish
Mercury is a reproductive neurotoxin that accumulates in fish at the top of the food chain. Fish to avoid or strictly limit when trying to conceive: tuna steak (canned light tuna is generally fine in moderation), swordfish, shark, king mackerel, tilefish, orange roughy, marlin.
Alcohol
No safe level of alcohol has been established for conception or early pregnancy. Even moderate alcohol intake has been associated with reduced IVF success rates in observational studies. For specifics, see our alcohol and fertility guide.
Antioxidant Foods and Fertility
Oxidative stress — an imbalance between free radical production and the body's antioxidant defenses — is a key driver of egg aging and sperm DNA fragmentation. A diet rich in antioxidants helps neutralize this damage.
Top antioxidant foods for fertility:
- Blueberries, strawberries, raspberries, blackberries
- Pomegranate (also studied for endometrial blood flow)
- Dark chocolate (70%+ cacao)
- Artichokes, kale, spinach, red cabbage
- Pecans, walnuts
- Green tea (moderate amounts — limit caffeine)
- Turmeric (curcumin is a potent anti-inflammatory)
Male Fertility Diet Specifics
Diet matters for sperm quality just as much as egg quality. The evidence for male fertility nutrition centers on:
Protective foods:
- Antioxidant-rich fruits and vegetables (reduce sperm DNA fragmentation)
- Omega-3 fatty acids (support sperm membrane integrity)
- Zinc and selenium (essential for testosterone synthesis and sperm motility)
- Lycopene from tomatoes (associated with better sperm morphology)
- Folate (supports sperm DNA integrity)
Foods to limit:
- Processed soy in large amounts (though moderate soy in food form appears safe)
- High-fat dairy linked to lower sperm motility in some studies
- Alcohol and recreational substances
- Processed and high-fat foods associated with higher sperm DNA fragmentation
For a comprehensive deep-dive, see our male infertility causes and treatment guide.
Fertility Diet for PCOS
PCOS (polycystic ovary syndrome) is the leading cause of ovulatory infertility, and diet is a cornerstone of PCOS management. The central metabolic issue in most PCOS cases is insulin resistance, which drives excess androgen production and disrupts ovulation.
The PCOS fertility diet emphasizes:
Low glycemic index (GI) carbohydrates: Replacing high-GI foods (white rice, white bread, sugary drinks) with low-GI alternatives (sweet potato, barley, lentils, quinoa) helps blunt insulin spikes. Studies show low-GI diets reduce fasting insulin and improve menstrual regularity in PCOS.
Anti-inflammatory foods: PCOS is characterized by low-grade inflammation. Following a Mediterranean-style diet reduces inflammatory markers (CRP, IL-6) and improves insulin sensitivity.
Inositol-rich foods: Myo-inositol and D-chiro-inositol are insulin-sensitizing compounds found naturally in whole grains, legumes, and fruits. They are also commonly supplemented in PCOS (see our PCOS fertility guide for details).
Limiting dairy and saturated fat: Some women with PCOS are more sensitive to IGF-1 in dairy, which can stimulate androgen production. The evidence is not conclusive, but limiting high-fat dairy while focusing on plant-based calcium sources (fortified almond milk, leafy greens, sardines) is a reasonable approach.
Adequate protein at each meal: Protein blunts the glycemic response of carbohydrates and supports satiety. Aim for 20-30g protein at each meal from eggs, legumes, fish, poultry, or Greek yogurt.
What to Eat During IVF Stimulation
The period of ovarian stimulation is when egg development is most sensitive to nutritional input. General recommendations from fertility nutritionists and reproductive endocrinologists include:
Emphasize:
- Protein at every meal (supports follicle development)
- Adequate hydration (3+ liters/day — important for follicular fluid production)
- Anti-inflammatory foods (olive oil, fatty fish, colorful vegetables)
- Complex carbohydrates to maintain steady energy and insulin levels
- Iron-rich foods if ferritin is low (vital for oxygenation of developing follicles)
Minimize:
- Alcohol (completely, during IVF)
- Caffeine (limit to 200mg/day or less)
- High-mercury fish
- Processed foods and added sugar
- Strenuous exercise (relevant to this period — see our exercise guide)
Before transfer: Some fertility nutrition specialists emphasize warming, easy-to-digest foods in the days around embryo transfer, though the evidence is primarily anecdotal. Focus on adequate hydration and avoiding anything that causes digestive distress.
Sample 7-Day Fertility Meal Plan
| Day | Breakfast | Lunch | Dinner | Snack |
|---|---|---|---|---|
| Monday | Greek yogurt + blueberries + walnuts | Lentil soup + whole grain bread + side salad | Baked salmon + roasted asparagus + quinoa | Brazil nuts (2) + orange |
| Tuesday | Spinach + egg scramble + avocado toast (sourdough) | Mediterranean grain bowl: chickpeas, cucumber, tomato, feta, olive oil | Chicken thighs + roasted sweet potato + steamed broccoli | Hummus + carrot sticks |
| Wednesday | Oatmeal + chia seeds + strawberries + almond butter | Sardines on whole grain crackers + arugula salad | Grass-fed beef stir-fry + bok choy + brown rice | Dark chocolate (70%+) + almonds |
| Thursday | Smoothie: spinach, frozen berries, flaxseed, protein powder, almond milk | Turkey and avocado wrap (whole wheat) + tomato soup | Baked cod + lemon + garlic + roasted Brussels sprouts + wild rice | Greek yogurt + pumpkin seeds |
| Friday | Eggs + sauteed mushrooms + half avocado | Quinoa salad: roasted beets, goat cheese, walnuts, arugula | Shrimp stir-fry + bell peppers + snap peas + soba noodles | Apple + almond butter |
| Saturday | Whole grain pancakes + blueberries + maple syrup (light) | Homemade lentil dal + brown rice + cucumber raita | Grilled mackerel + tabbouleh (bulgur, parsley, tomato, lemon) | Edamame + sea salt |
| Sunday | Veggie omelette (peppers, onions, spinach) + fruit salad | Split pea soup + sourdough + side salad | Lamb and white bean stew + roasted root vegetables | Walnuts + dried cranberries |
This meal plan is designed for one person and is gluten-flexible (swap grains as needed). Caloric needs vary — scale portion sizes based on your individual requirements.
Practical Implementation Tips
Start before you start trying. Egg development (folliculogenesis) takes approximately 90 days. Dietary changes made three months before conception attempts have the most impact on egg quality.
Batch cook staples. Keeping cooked lentils, roasted vegetables, and hard-boiled eggs in the fridge makes it dramatically easier to eat well during a stressful IVF cycle.
Don't let perfect be the enemy of good. An 80/20 approach — following a fertility-supporting diet most of the time — is realistic and sustainable. Occasional deviations won't undo consistent habits.
Work with a registered dietitian. If you have PCOS, are significantly over- or underweight, have food allergies, or are undergoing IVF, a registered dietitian who specializes in fertility can provide personalized guidance beyond what any general guide can offer.
Coordinate with your medical team. Before starting any new supplement, check with your reproductive endocrinologist. Some antioxidants may interfere with IVF medications, and your protocol matters.
The Bottom Line
No fertility diet will guarantee conception, and no single food will cause or prevent pregnancy. What the evidence consistently supports is this: an overall dietary pattern rich in plant foods, anti-inflammatory fats, adequate protein, and micronutrients — while limiting ultra-processed foods, trans fats, and alcohol — creates the hormonal and cellular environment most conducive to conception.
The Mediterranean dietary pattern, supported by the strongest body of evidence, is a practical and sustainable framework for most people. Combined with targeted supplementation for specific nutrient needs, it represents the current best practice in fertility nutrition.
Frequently Asked Questions
Q: Is there one specific "fertility diet" I should follow? A: No single diet has been proven to guarantee conception, but the Mediterranean dietary pattern — rich in vegetables, legumes, whole grains, fish, and olive oil — has the strongest evidence base for supporting reproductive health in both women and men. Focus on overall dietary quality rather than individual "superfoods."
Q: Does alcohol affect fertility? A: Yes, even moderate drinking is associated with reduced fecundability (cycle-by-cycle probability of conception). The safest approach when actively trying to conceive or undergoing IVF is to eliminate alcohol entirely. The effects are dose-dependent — occasional drinking has a smaller impact than regular consumption — but no truly safe threshold has been established for fertility patients.
Q: Should I take prenatal vitamins before I get pregnant? A: Yes. Folic acid (400–800 mcg/day) should be started at least one month before trying to conceive to reduce the risk of neural tube defects. Most clinicians recommend a comprehensive prenatal vitamin that also includes iron, vitamin D, iodine, and omega-3 DHA. Some women benefit from methylfolate (the active form) if they have MTHFR gene variants that impair folate conversion.
Q: Does caffeine affect fertility? A: At moderate levels (under 200 mg/day — roughly one 12-oz coffee), caffeine has not been shown to significantly impair fertility or increase miscarriage risk in most studies. Higher intake is associated with modest reductions in fecundability. During IVF, many clinicians recommend limiting caffeine to under 200 mg/day as a precaution.
Q: Do antioxidant supplements improve egg or sperm quality? A: Possibly, but the evidence is stronger for sperm than eggs. Coenzyme Q10 (CoQ10) has the most evidence for improving sperm parameters and may support mitochondrial function in oocytes. Vitamin C, vitamin E, and zinc are associated with improved sperm quality in deficient men. For eggs, CoQ10 (200–600 mg/day) is the most commonly recommended supplement, though large randomized trials showing improved IVF outcomes are still lacking.
