The foods you eat in the months before conception can meaningfully shift your chances of getting pregnant. Women who closely follow a Mediterranean-style diet, rich in vegetables, whole grains, fish, and olive oil, are roughly twice as likely to achieve a live birth through fertility treatment compared to women with the lowest adherence to that pattern. Even for couples conceiving naturally, the same dietary principles support ovulation, hormone balance, and sperm quality.
The Mediterranean Pattern and Why It Works
A Mediterranean-style diet is the most studied eating pattern in fertility research, and the results are striking. In a meta-analysis published in Advances in Nutrition, women with the highest adherence to this diet had a 44% probability of live birth, compared to 31% for women with the lowest adherence. That’s not a marginal difference.
In practice, this pattern looks like plenty of vegetables, fruits, legumes, whole grains, nuts, olive oil, and fish, with moderate amounts of poultry and dairy and limited red meat and sweets. You don’t need to follow a rigid plan. The benefit comes from the overall pattern: lots of plants, healthy fats, and minimally processed foods working together to reduce inflammation, stabilize blood sugar, and support reproductive hormones.
Carbs That Help (and Ones That Don’t)
Not all carbohydrates affect your fertility the same way. Women who eat mostly low-glycemic foods, those that release sugar slowly into the bloodstream, have a lower risk of ovulation problems. High-glycemic foods like white bread, sugary drinks, and french fries cause large blood sugar spikes. Over time, these spikes can increase insulin resistance, which disrupts the hormones that trigger ovulation.
The swap is straightforward: choose oatmeal, barley, brown rice, lentils, chickpeas, beans, vegetables, and whole fruits over highly processed carbs and oversized portions of white pasta or rice. You don’t need to cut carbs. You need to choose ones that digest slowly.
Fats That Support Ovulation
Unsaturated fats, the kind found in olive oil, avocados, nuts, and fatty fish, appear to improve ovulation. Trans fats, found in some fried and commercially baked foods, do the opposite. This is one of the clearest dietary signals in fertility research: the type of fat matters more than the amount.
Omega-3 fatty acids deserve special attention. A systematic review of randomized trials found that omega-3 supplementation increased sperm count and improved sperm shape and motility, so these fats benefit both partners. Good food sources include salmon, sardines, mackerel (not king mackerel, which is high in mercury), walnuts, chia seeds, and flaxseeds.
The Full-Fat Dairy Surprise
One of the more unexpected findings from the large Nurses’ Health Study at Harvard is that one to two servings per day of full-fat dairy, such as whole milk, whole-milk yogurt, or 4% cottage cheese, appear to protect ovulatory function. Skim and low-fat dairy products had the opposite effect. The likely reason: removing cream from milk changes its balance of sex hormones in a way that can interfere with ovulation.
This doesn’t mean you need to drink glasses of whole milk. But if you eat yogurt or put milk in your coffee, choosing the full-fat version is a small change that aligns with the evidence.
Key Nutrients to Prioritize
Folate
The CDC recommends that all women capable of becoming pregnant get 400 micrograms of folic acid daily. This B vitamin is critical for preventing neural tube defects in the earliest days of pregnancy, often before you know you’re pregnant. Leafy greens, fortified cereals, lentils, and asparagus are good dietary sources, but most experts recommend a supplement to ensure you consistently hit the target. Women who have had a previous pregnancy affected by a neural tube defect are advised to take 4,000 micrograms daily under medical guidance.
Vitamin D
Vitamin D plays a role in implantation and early pregnancy. In a prospective study at an Italian fertility center, women with adequate vitamin D levels (20 to 40 ng/mL is generally considered optimal) had higher pregnancy rates than women with levels below 20 ng/mL. Many people are deficient without knowing it, especially those who live in northern climates or spend most of their time indoors. Fatty fish, egg yolks, and fortified milk provide some vitamin D, but a blood test is the only way to know your actual level.
Zinc and Selenium
Both zinc and selenium improve sperm motility, and selenium also improves sperm shape. For your partner, good sources of zinc include oysters, beef, pumpkin seeds, and chickpeas. Brazil nuts are one of the richest food sources of selenium, with just two or three nuts providing a full day’s worth.
What Your Partner Should Eat
Fertility nutrition isn’t just about the person carrying the pregnancy. A meta-analysis of randomized clinical trials found that zinc, selenium, omega-3 fatty acids, and CoQ10 all improved different aspects of sperm quality. Zinc and omega-3s increased sperm count. Selenium, omega-3s, and CoQ10 improved sperm shape. All of these nutrients plus selenium boosted motility.
The practical takeaway: your partner benefits from the same Mediterranean-style pattern. Fish a couple of times a week, a handful of nuts or seeds daily, plenty of vegetables, and fewer processed foods create a foundation that covers most of these nutrients. CoQ10 is harder to get from food alone (it’s found in organ meats and sardines in small amounts), so some couples opt for a supplement.
What to Limit or Avoid
Caffeine
You don’t have to give up coffee entirely. The recommended limit for women trying to conceive is 200 milligrams of caffeine per day, roughly two standard cups of brewed coffee. Tea, chocolate, and some sodas also contribute to your daily total, so it’s worth a quick tally if you consume multiple sources.
Alcohol
There is no established “safe” amount of alcohol during pregnancy, and because you won’t know the exact day of conception, many fertility specialists recommend cutting back or eliminating alcohol while actively trying. Heavy drinking clearly impairs both female ovulation and male sperm quality.
High-Mercury Fish
Fish is one of the best fertility foods, but certain species accumulate dangerous levels of mercury. Avoid shark, swordfish, king mackerel, and tilefish. The FDA recommends eating 8 to 12 ounces (two to three servings) per week of lower-mercury options like salmon, shrimp, tilapia, pollock, and canned light tuna.
Highly Processed Foods
Ultra-processed foods, the kind with long ingredient lists full of additives, tend to be high-glycemic, high in trans fats, and low in the micronutrients that support fertility. Replacing even a few processed meals per week with whole-food alternatives moves the needle on multiple fronts at once: better blood sugar control, more antioxidants, and fewer inflammatory fats.
Putting It All Together
A fertility-friendly plate looks like this: half filled with colorful vegetables and fruit, a quarter with whole grains or legumes, and a quarter with protein from fish, poultry, eggs, or plant sources. Add olive oil for cooking and dressing, a serving of full-fat dairy, and a small handful of nuts or seeds. Take a prenatal vitamin with at least 400 micrograms of folic acid and ask about vitamin D if you haven’t had your levels checked.
These changes are most effective when you start two to three months before trying to conceive. That’s roughly one full cycle of egg maturation and one full cycle of sperm production, giving both partners’ reproductive cells the best nutritional environment from the start.