The foods you eat in the months before trying to conceive have a measurable effect on your chances of getting pregnant. A large study of over 17,000 women found that those who followed a fertility-friendly diet had a 66% lower risk of infertility related to ovulation problems and a 27% lower risk of infertility from other causes. Not following this diet pattern was the single biggest attributable factor in infertility cases in the study, outweighing even BMI and physical activity levels. The good news: these are straightforward dietary shifts, not extreme changes.
The Core Pattern That Improves Fertility
The diet linked to the strongest fertility outcomes in research centers on four pillars: plant-based protein, full-fat dairy, iron-rich foods, and monounsaturated fats. This combination appears to support regular ovulation, which is the most common dietary-related barrier to conception.
A similar pattern showed up in a study of Spanish women. Those who most closely followed a Mediterranean-style diet, rich in vegetables, fish, and polyunsaturated oils, had 44% lower odds of needing medical help for difficulty getting pregnant compared to women who ate the least like this. The takeaway across both studies is consistent: a diet built around whole plant foods, healthy fats, and quality protein sources creates a better hormonal environment for conception.
Swap Your Protein Sources
Replacing some animal protein with plant protein is one of the most consistent recommendations in fertility nutrition research. Lentils, chickpeas, black beans, tofu, and nuts all count. You don’t need to go vegetarian. Even shifting one or two meals a day toward plant-based protein sources makes a difference. Beans and lentils pull double duty here because they’re also rich in folate and iron, two nutrients critical during the preconception window.
Choose Full-Fat Dairy Over Skim
This one surprises most people. Research from the Nurses’ Health Study found that one to two servings per day of full-fat dairy, such as whole milk, whole milk yogurt, or full-fat cottage cheese, appeared to protect against ovulatory infertility. Skim and low-fat dairy products had the opposite effect.
The reason likely comes down to hormones. When cream is removed from milk, it changes the balance of sex hormones in the product in a way that may interfere with ovulation. If you currently drink skim milk or eat low-fat yogurt, switching to full-fat versions while you’re trying to conceive is a simple change worth making. You can always switch back later.
Eat More Healthy Fats
Monounsaturated fats, the kind found in olive oil, avocados, almonds, and cashews, are a cornerstone of the fertility diet pattern. These fats support hormone production and reduce inflammation, both of which matter for ovulation and implantation.
Omega-3 fatty acids from fish also play a role. Research has linked higher omega-3 levels to improved reproductive outcomes, and fish is one of the best dietary sources. Aim for two to three servings per week of low-mercury fish like salmon, sardines, trout, or shrimp. A single serving during pregnancy and preconception is about 4 ounces. Avoid high-mercury species: king mackerel, marlin, orange roughy, shark, swordfish, Gulf of Mexico tilefish, and bigeye tuna. Mercury can accumulate in the body and harm fetal development.
Get Enough Folate and Iron
The CDC recommends all women capable of becoming pregnant get 400 micrograms of folic acid daily. Folate (the natural form found in food) is essential for preventing neural tube defects in the earliest days of pregnancy, often before you even know you’re pregnant. Dark green leafy vegetables like spinach, kale, and romaine lettuce are excellent sources, along with beans, lentils, and fortified cereals. Most prenatal vitamins contain the recommended amount, but building folate-rich foods into your regular meals gives you an additional dietary foundation.
Iron from plant sources (spinach, fortified cereals, beans, pumpkin seeds) was specifically identified in the fertility diet research as beneficial. Pairing iron-rich plant foods with vitamin C, like squeezing lemon over sautéed greens, helps your body absorb more of it.
What to Cut Back On
Sugar-sweetened drinks stand out as a clear negative. Women who consumed three or more servings of soda per day had a 52% lower rate of pregnancy compared to women who drank none. That’s a striking drop for a single dietary habit. Cutting soda and sugary drinks is one of the highest-impact changes you can make.
Keep caffeine under 200 milligrams per day, which is roughly two standard cups of coffee. You don’t necessarily need to eliminate it entirely, but staying under that threshold is the consistent recommendation for women trying to conceive. Remember that tea, chocolate, and some soft drinks also contribute to your daily caffeine total.
Alcohol is worth minimizing or eliminating. There’s no established “safe” amount during conception and early pregnancy, and alcohol can disrupt hormone balance and ovulation timing.
Your Partner’s Diet Matters Too
Fertility isn’t only about the person carrying the pregnancy. What your partner eats directly affects sperm quality. Plant-based whole foods are high in antioxidants like vitamin C, coenzyme Q10, and lycopene, all of which have been linked to higher sperm concentrations. A diet heavy in processed food, saturated fat, and sugar can do the opposite.
The practical version: your partner benefits from the same general dietary pattern. More vegetables, fruits, nuts, and whole grains. Less fast food, processed meat, and sugary drinks. Sperm take about three months to develop, so dietary improvements made now won’t show their full effect on sperm quality for roughly 10 to 12 weeks.
Weight and Fertility
A BMI between 18.5 and 24.9 is associated with the highest chance of conceiving. Being significantly above or below this range can disrupt ovulation. Body fat plays an active role in hormone production, so too much or too little can throw off the signals your body needs to release an egg each cycle.
The encouraging finding from pooled research: women who participated in active diet and exercise programs were 59% more likely to become pregnant than control participants. You don’t need to reach a perfect weight before trying. Even modest movement toward a healthier range improves your odds. The combination of the dietary shifts described above with regular moderate exercise addresses both nutrition and weight simultaneously.
Putting It All Together
A fertility-supportive plate looks something like this: a generous portion of vegetables, a serving of plant protein or low-mercury fish, a drizzle of olive oil, and a side of whole grains. Snack on nuts and full-fat yogurt. Drink water instead of soda. Have your morning coffee if you want it, but stop at two cups.
These aren’t dramatic restrictions. The research consistently points toward a pattern of eating that most nutrition experts would recommend for general health anyway, with a few specific tweaks like choosing full-fat dairy and prioritizing plant protein. Start making these changes at least three months before you want to conceive if possible, giving your body time to build up nutrient stores and establish a more favorable hormonal environment. The same timeline applies to your partner’s dietary changes, since sperm development takes roughly a full cycle to reflect new habits.