The foods you eat in the months before trying to get pregnant can meaningfully affect your hormonal balance, ovulation, and egg quality. The most impactful changes involve shifting toward whole, nutrient-dense foods: more vegetables, healthy fats, fish, and whole grains, while cutting back on sugar and highly processed carbohydrates. Ideally, start making these changes at least three months before you begin trying, since eggs take roughly that long to mature before ovulation.
Why Three Months Matters
Your body doesn’t respond to dietary changes overnight. An egg goes through about 90 days of development before it’s released during ovulation, which means the nutrients available during that window directly influence egg quality. The same applies to sperm, which take roughly three months to fully develop. Starting early gives your body time to build up nutrient stores, stabilize blood sugar, and create a more favorable hormonal environment for conception.
Folate: The One Nutrient You Cannot Skip
Folate is essential for preventing neural tube defects in very early pregnancy, often before you even know you’re pregnant. The U.S. Preventive Services Task Force recommends 400 to 800 micrograms (mcg) of folic acid daily, starting at least one month before conception and continuing through the first two to three months of pregnancy. A supplement is the most reliable way to hit this target because the synthetic form (folic acid) is roughly 85% bioavailable when taken with food, compared to only about 50% for the folate found naturally in foods like leafy greens, lentils, and fortified cereals.
That doesn’t mean food sources are useless. Spinach, asparagus, black beans, and avocados all contribute folate to your diet. But given the absorption gap, a daily prenatal vitamin or standalone folic acid supplement is the standard recommendation for anyone trying to conceive.
Keep Blood Sugar Steady
High-sugar diets and refined carbohydrates can disrupt ovulation through a surprisingly direct mechanism. When your blood sugar spikes repeatedly, your body produces more insulin to compensate. Chronically elevated insulin can trigger your body to produce excess testosterone, which interferes with the hormonal signals that control ovulation. This connection is especially strong for women with polycystic ovary syndrome (PCOS), but it affects ovulatory function broadly.
In practical terms, this means choosing carbohydrates that break down slowly: whole grains, sweet potatoes, beans, lentils, and oats rather than white bread, pastries, sugary drinks, and white rice. You don’t need to eliminate carbs. You need to choose ones that don’t cause rapid blood sugar spikes. Pairing carbs with protein or fat (an apple with almond butter, for instance) also slows the glucose response.
Healthy Fats Over Low-Fat Everything
One of the more counterintuitive findings from fertility nutrition research comes from the Nurses’ Health Study, which tracked thousands of women over several years. Women who ate one to two servings of full-fat dairy per day, such as whole milk, whole-milk yogurt, or regular cottage cheese, appeared to have some protection against ovulatory infertility. Skim and low-fat dairy products showed the opposite pattern.
The likely explanation is that removing the fat from milk changes the balance of reproductive hormones in the product. Fat-soluble hormones ride along with the cream, so when you skim it off, you’re left with a different hormonal profile that may subtly affect ovulation. This doesn’t mean you should drink a gallon of whole milk a day, but swapping your skim latte for a whole-milk one or choosing full-fat Greek yogurt is a reasonable move while you’re trying to conceive.
Beyond dairy, prioritize other sources of healthy fats: olive oil, avocados, nuts, seeds, and fatty fish. These provide the building blocks for hormone production and help reduce inflammation.
Fish: Aim for Two to Three Servings a Week
Fish is one of the best food sources of omega-3 fatty acids, which support hormone regulation and healthy blood flow to reproductive organs. The FDA recommends that women who are pregnant or trying to become pregnant eat 8 to 12 ounces of low-mercury seafood per week, which works out to two to three servings (one serving is about 4 ounces, or the size of your palm).
Your best options for low mercury levels include salmon, sardines, shrimp, cod, tilapia, catfish, trout, herring, and canned light tuna. These are all in the FDA’s “Best Choices” category. Fish like halibut, mahi mahi, snapper, and albacore tuna are considered “Good Choices” but should be limited to one serving per week due to moderate mercury levels.
A few fish should be avoided entirely because of high mercury content: swordfish, shark, king mackerel, marlin, orange roughy, bigeye tuna, and Gulf of Mexico tilefish. Mercury accumulates in your body over time and can harm a developing baby’s nervous system, so it’s worth making the switch well before conception.
Iron From Plants and Supplements
Iron plays a role in ovulation, but the type of iron matters. Research has found that heme iron, the kind found in red meat and poultry, doesn’t appear to affect how long it takes to conceive. Non-heme iron, found in plant foods like spinach, lentils, beans, and fortified cereals, as well as in supplements, showed a modest benefit for certain groups of women, particularly those who had previously given birth or who had heavy periods.
If you’re not anemic, you probably don’t need to load up on iron supplements. But making sure you regularly eat iron-rich plant foods is a smart baseline. Pairing them with vitamin C (like squeezing lemon over sautéed spinach or eating strawberries alongside beans) significantly improves absorption of non-heme iron.
A Whole-Diet Approach Works Better Than Single Foods
No single food will make or break your fertility. Research on the Mediterranean diet and IVF outcomes, for example, found no clear overall association between strict adherence to that eating pattern and successful pregnancy. The pattern did show a modest benefit for women over 35, but broadly, it’s the cumulative effect of many good choices rather than one magic ingredient that matters.
A fertility-supportive eating pattern looks something like this:
- Vegetables and fruits at most meals, especially dark leafy greens, berries, and colorful produce rich in antioxidants
- Whole grains like oats, quinoa, brown rice, and whole wheat bread instead of refined versions
- Protein from varied sources including beans, lentils, nuts, fish, eggs, and poultry
- Full-fat dairy in moderate amounts, one to two servings daily
- Healthy fats from olive oil, avocados, nuts, and seeds
- Limited added sugar and processed snacks, sugary drinks, and white flour products
What to Cut Back On
Alcohol is worth reducing or eliminating while trying to conceive, since even moderate intake has been linked to longer time to pregnancy in some studies. Caffeine in moderate amounts (under about 200 mg per day, roughly one 12-ounce cup of coffee) is generally considered acceptable, but higher intake may be worth scaling back.
Trans fats, found in some fried foods, packaged baked goods, and anything listing “partially hydrogenated oil” on the label, are particularly worth avoiding. They promote insulin resistance and inflammation, both of which can interfere with ovulation. Most processed snack foods and fast food items are the main culprits here.
Highly processed meats like bacon, hot dogs, and deli meats are also worth limiting. They tend to be high in sodium, preservatives, and unhealthy fats while offering little nutritional value for fertility.
Putting It All Together
Start a prenatal vitamin with 400 to 800 mcg of folic acid as soon as you decide you’d like to conceive. Then focus on building meals around whole, minimally processed foods with plenty of vegetables, quality protein, and healthy fats. Swap refined carbs for whole grains, choose full-fat dairy over low-fat, eat fish twice a week, and limit sugar. These aren’t dramatic overhauls. They’re shifts that, given three months to take effect, create the nutritional foundation your body needs to support ovulation, implantation, and the earliest days of pregnancy.