Certain foods can meaningfully improve your chances of conceiving, and the evidence is stronger than you might expect. Women who closely followed a Mediterranean-style diet in one study had a 50% clinical pregnancy rate compared to 29% among those with the lowest adherence. The core pattern across research points to more plants, healthy fats, and whole grains, with less processed meat, refined carbohydrates, and trans fats.
The Mediterranean Pattern and Why It Works
The dietary pattern most consistently linked to improved fertility resembles a Mediterranean diet: heavy on vegetables, fruits, whole grains, legumes, fish, and olive oil, with limited red meat and processed foods. Studies on women undergoing fertility treatment found that high adherence to this pattern nearly doubled clinical pregnancy rates and was associated with live birth rates of 49% versus 27% in the lowest-adherence group.
This isn’t about one magic ingredient. The pattern works through multiple channels at once: antioxidants from fruits and vegetables support egg quality and development, omega-3 fats from fish improve both egg and sperm health, whole grains provide B vitamins and fiber that help regulate hormones, and olive oil delivers monounsaturated fats that benefit sperm quality. The combination matters more than any single food.
Plant Protein Over Red Meat
One of the most striking findings in fertility nutrition research comes from the Nurses’ Health Study II, which tracked thousands of women over years. Replacing just 5% of total calorie intake from animal protein with plant protein reduced the risk of ovulatory infertility by more than 50%. Red meat and poultry specifically were linked to higher rates of anovulation, the failure to release an egg during a menstrual cycle.
The likely reason is insulin. Plant proteins trigger a weaker insulin response than animal proteins, and insulin sensitivity plays a central role in ovulation. High insulin levels can increase free testosterone and alter the maturation of eggs. Good plant protein sources include lentils, chickpeas, black beans, tofu, tempeh, and quinoa. You don’t need to go fully vegetarian. Even shifting the balance so that more of your protein comes from plants can make a difference, particularly for women over 32.
Why Carbohydrate Quality Matters
Not all carbohydrates affect fertility equally. Diets high on the glycemic index (foods that spike blood sugar quickly, like white bread, sugary drinks, and refined cereals) are associated with a higher chance of infertility. The mechanism comes back to insulin: when blood sugar spikes repeatedly, your body produces more insulin, which can disrupt the hormonal signals that trigger ovulation.
This is especially relevant for women with polycystic ovary syndrome (PCOS), where insulin resistance is already a core issue. Swapping refined carbohydrates for slow-digesting options like steel-cut oats, sweet potatoes, brown rice, barley, and most whole fruits helps keep blood sugar stable. The goal isn’t to avoid carbohydrates altogether. It’s to choose ones that release energy gradually.
Omega-3 Fats and Egg Quality
Omega-3 fatty acids, particularly the type found in cold-water fish called DHA, have a direct effect on egg quality. Research in animal models shows that a diet rich in omega-3s improved the internal structure of eggs in two key ways: mitochondria (the energy-producing components of cells) stayed evenly distributed rather than clumping together, and the spindle apparatus that organizes chromosomes during cell division maintained its proper shape. Both of these markers are associated with healthier, more viable eggs.
The benefit appears most significant for women of advanced reproductive age, where egg quality naturally declines. Salmon, sardines, mackerel, herring, and anchovies are the richest food sources. Walnuts, flaxseeds, and chia seeds provide a plant-based form of omega-3 that your body partially converts to DHA, though less efficiently than getting it directly from fish.
Trans Fats: The Biggest Dietary Risk
If there’s one category of food to actively avoid when trying to conceive, it’s trans fats. Each 2% increase in calories from trans fats (replacing carbohydrates) was associated with a 73% greater risk of ovulatory infertility. When trans fats replaced monounsaturated fats like those in olive oil, the risk more than doubled.
Trans fats are found in some margarines, commercially fried foods, packaged baked goods, and anything listing “partially hydrogenated oil” on the label. While many countries have restricted artificial trans fats in recent years, they haven’t disappeared entirely. Checking ingredient lists is still worthwhile, especially for imported or shelf-stable processed foods.
Iron From Plants, Not Meat
Iron intake matters for ovulation, but with an important twist: only non-heme iron (the type found in plants, supplements, and fortified foods) was associated with reduced ovulatory infertility risk. Heme iron from red meat showed no protective effect. Women who took iron supplements had a 40% lower risk of ovulatory infertility compared to those who didn’t.
Rich food sources of non-heme iron include spinach, lentils, chickpeas, fortified cereals, pumpkin seeds, and dark chocolate. Pairing these with vitamin C-rich foods (citrus, bell peppers, strawberries) improves absorption significantly.
Folate Before Conception
Folate is essential not just during pregnancy but before it. The U.S. Preventive Services Task Force recommends that anyone planning to become pregnant take 400 to 800 micrograms of folic acid daily, starting at least one month before conception and continuing through the first trimester. This is primarily to prevent neural tube defects, but adequate folate also supports the rapid cell division involved in early embryo development.
Food sources alone can contribute meaningfully. Half a cup of cooked spinach provides 131 micrograms, half a cup of black-eyed peas delivers 105, and four spears of asparagus contain 89. Brussels sprouts, fortified rice, and fortified breakfast cereals are other solid sources. Most experts still recommend a supplement on top of dietary folate, since the synthetic form (folic acid) is more reliably absorbed.
Full-Fat Dairy Over Low-Fat
A prospective study found that women who consumed one or more servings of full-fat dairy per day had a 27% lower risk of anovulatory infertility compared to women who ate one serving or less per week. Interestingly, low-fat dairy didn’t show the same benefit. The likely explanation involves the processing: removing fat from dairy also removes fat-soluble hormones, shifting the balance toward water-soluble compounds that may interfere with ovulation.
This doesn’t mean you need to drink whole milk by the glass. A serving of full-fat yogurt, a slice of cheese, or a small amount of ice cream counts. The research suggests that if you’re choosing between skim and whole milk specifically for fertility purposes, full-fat is the better option.
Foods That Support Male Fertility
Fertility is a two-person equation, and diet affects sperm quality substantially. Adding nuts to a typical Western diet significantly improved total sperm count, motility (how well sperm swim), vitality, and morphology (sperm shape). Walnuts in particular have been studied for this effect, likely due to their high omega-3 content.
Tomatoes, especially cooked or canned, are rich in lycopene, a pigment that was associated with better sperm morphology and motility in healthy young men. Fish intake was favorably associated with multiple semen quality indicators, while processed meat showed the opposite pattern. For men trying to improve fertility through diet, the practical takeaway is similar to the advice for women: more fish, nuts, fruits, and vegetables, less processed and red meat.