According to Gram Research analysis, eating a Mediterranean-style diet or following traditional healthy eating patterns before fertility treatment may increase your chances of having a baby by about 5-6%. A 2026 prospective cohort study of 2,370 couples found that women eating more healthily had higher live birth rates, and the benefits were similar whether couples followed Mediterranean diets or the Healthy Eating Index. Importantly, special fertility diets didn’t work better than regular healthy eating, suggesting couples should focus on proven healthy eating patterns rather than specialized programs.
A new study of 2,370 couples planning fertility treatment found that eating a healthy diet before getting pregnant may slightly increase the chances of having a baby. Researchers looked at what both partners ate and compared it to four different eating patterns, including Mediterranean-style diets and special “fertility diets.” The results showed that traditional healthy eating patterns—the kind doctors recommend for everyone—were linked to better pregnancy outcomes. Interestingly, special fertility diets didn’t work any better than regular healthy eating, suggesting that couples don’t need complicated meal plans to improve their chances of conception.
Key Statistics
A 2026 prospective cohort study of 2,370 couples undergoing fertility treatment found that women following Mediterranean Diet patterns had a 5-6% higher likelihood of live birth compared to those with lower diet quality scores.
Among 2,370 couples in fertility treatment, 1,054 became pregnant, 287 experienced miscarriage, and 821 had successful live births, with healthier eating patterns associated with improved live birth rates but not reduced miscarriage risk.
A 2026 study of 2,370 couples found that special Pro-fertility diets showed no association with live birth rates, while traditional healthy eating patterns like the Mediterranean Diet demonstrated modest but consistent benefits.
Research of 2,370 couples showed that both partners eating healthily produced similar fertility benefits to just the woman eating well, suggesting couple-level dietary improvements matter for fertility outcomes.
The Quick Take
- What they studied: Whether eating healthy foods before trying to get pregnant helps couples successfully conceive and have babies
- Who participated: 2,370 heterosexual couples (4,740 people total) who were planning to undergo fertility treatment at four major U.S. fertility clinics between 2013 and 2019
- Key finding: Couples who ate more like the Mediterranean diet or followed the Healthy Eating Index had about 5-6% better chances of having a live birth, though the improvement was modest. Interestingly, special ‘fertility diets’ didn’t work better than regular healthy eating
- What it means for you: If you’re planning to get pregnant, focus on eating the healthy foods doctors already recommend—like vegetables, fruits, whole grains, and fish—rather than buying special fertility diet programs. Both partners eating well may help slightly, but don’t expect dramatic results. This is most relevant for couples using fertility treatments
The Research Details
Researchers followed 2,370 couples who were starting fertility treatment at four U.S. fertility clinics. Before treatment began, each person filled out a detailed food questionnaire describing everything they ate over the past year. The researchers then scored each person’s diet based on four different eating patterns: two traditional healthy diets (the Healthy Eating Index and Mediterranean Diet) and two special fertility diets. They tracked which couples got pregnant and which had babies, then looked for connections between diet quality and pregnancy success.
The study was “prospective,” meaning researchers collected diet information before knowing the pregnancy outcomes, which is a strong research design. They combined each partner’s diet score to see if eating well as a couple mattered more than just one person eating well. The researchers used statistical methods to account for other factors that might affect pregnancy, like age and body weight.
This research approach is important because it looks at both partners’ eating habits, not just the woman’s diet. Previous studies often ignored what men ate, even though male nutrition can affect sperm quality and fertility. By studying real couples going through actual fertility treatment, the researchers could see real-world results rather than just lab findings. The prospective design (measuring diet before knowing outcomes) prevents bias from people changing their memories based on whether they got pregnant.
This study has several strengths: it included a large number of couples, used validated food questionnaires that have been tested for accuracy, and tracked real pregnancy outcomes. However, the study only included couples seeking fertility treatment, so results may not apply to couples trying to conceive naturally. The study also relied on people remembering what they ate, which can be imperfect. Additionally, the improvements in pregnancy rates were modest (5-6%), meaning diet is just one of many factors affecting fertility.
What the Results Show
Among the 2,370 couples studied, 1,054 became pregnant, 287 experienced miscarriage before 20 weeks, and 821 had successful live births. Women who ate more like the Mediterranean diet or followed the Healthy Eating Index had about 5-6% higher chances of having a live baby. When researchers looked at men’s diets alone, the results were similar but slightly weaker. When both partners ate healthily, the benefits were similar to when just the woman ate well.
The most interesting finding was that special “fertility diets” designed specifically for pregnancy didn’t work better than regular healthy eating patterns. The Pro-fertility Diet showed no connection to live birth rates at all. This suggests that couples don’t need expensive specialty diet programs—regular healthy eating is just as effective and probably easier to follow.
None of the dietary patterns were associated with preventing miscarriage, meaning diet didn’t appear to reduce pregnancy loss in this study. This is an important finding because it shows diet’s benefits are limited to improving the chances of getting pregnant, not necessarily preventing miscarriage.
The study found that the benefits of healthy eating appeared similar whether looking at traditional healthy patterns or fertility-focused patterns (except the Pro-fertility Diet). The Healthy Eating Index and Mediterranean Diet showed consistent modest benefits across female partners, male partners, and couples combined. The Fertility Diet showed benefits for women but not as clearly for men or couples together. These patterns suggest that established, well-researched healthy eating approaches work better than newer, specialized fertility diets.
This research builds on previous studies showing that diet affects fertility, but it’s one of the first to systematically compare multiple dietary patterns in both partners simultaneously. Earlier research focused mainly on women’s diets or individual nutrients. This study confirms that Mediterranean-style eating and other traditional healthy patterns support fertility, consistent with what we know about these diets improving overall health. The finding that special fertility diets don’t outperform regular healthy eating is somewhat surprising and suggests that marketing claims about fertility-specific foods may be overstated.
The study only included couples seeking fertility treatment, so results may not apply to couples trying to conceive naturally or those with different fertility challenges. The study relied on people remembering what they ate, which can be inaccurate. The improvements in pregnancy rates were modest (5-6%), so diet is clearly just one factor among many affecting fertility. The study couldn’t prove that diet caused better outcomes—only that healthier diets were associated with better results. Additionally, the study was conducted at U.S. fertility clinics, so results may not apply to different populations or countries with different food availability.
The Bottom Line
If you’re planning to get pregnant and considering fertility treatment, eating a Mediterranean-style diet or following the Healthy Eating Index is supported by this research (moderate confidence level). Focus on vegetables, fruits, whole grains, fish, and healthy oils rather than buying special fertility diet programs. Encourage your partner to eat healthily too, as both partners’ nutrition appears to matter. Don’t expect diet alone to solve fertility problems—it’s one piece of a larger picture that includes medical treatment, age, and other health factors.
This research is most relevant for heterosexual couples planning fertility treatment. It may also apply to couples trying to conceive naturally, though the study didn’t specifically test this. The findings are less relevant for people with specific medical conditions affecting fertility, as diet alone won’t overcome those issues. If you have concerns about fertility, consult with a fertility specialist rather than relying only on dietary changes.
Don’t expect immediate results. The couples in this study were undergoing fertility treatment, which typically takes months. If you’re trying to conceive naturally, it’s reasonable to give healthy eating 3-6 months before assessing results, though fertility depends on many factors beyond diet. Changes to eating habits work best when maintained long-term, so focus on sustainable dietary changes rather than short-term diet programs.
Frequently Asked Questions
Does diet really affect fertility and pregnancy chances?
Yes, according to a 2026 study of 2,370 couples, eating a Mediterranean-style diet or following healthy eating guidelines was associated with a 5-6% higher chance of live birth. However, diet is just one factor—medical treatment, age, and other health conditions matter more for most couples.
Should I buy a special fertility diet program or just eat healthy?
Just eat healthy. A 2026 study found that traditional healthy diets like the Mediterranean pattern worked just as well as specialized fertility diets, and they’re easier to follow. Save your money and focus on vegetables, fruits, whole grains, and fish instead.
Does my partner’s diet matter for getting pregnant?
Yes, research shows both partners’ eating habits appear to affect fertility outcomes. A 2026 study of 2,370 couples found that when both partners ate healthily, pregnancy success improved similarly to when just the woman ate well, suggesting male nutrition matters too.
Can eating better prevent miscarriage?
Based on a 2026 study of 2,370 couples, diet didn’t appear to reduce miscarriage risk. While healthy eating may help you get pregnant, it doesn’t seem to prevent pregnancy loss, which is influenced by other factors like age and genetics.
How long should I eat healthy before trying to get pregnant?
Start now if you’re planning pregnancy. The couples in this 2026 study had their diet assessed before fertility treatment. Give healthy eating at least 3-6 months to become a habit, though fertility depends on many factors beyond diet alone.
Want to Apply This Research?
- Track daily servings of vegetables, fruits, whole grains, and fish using the app’s food logging feature. Aim for at least 5 servings of produce and 2-3 servings of fish per week. Compare your weekly totals to the Mediterranean Diet guidelines to see how closely you’re following this pattern
- Set a weekly goal to try one new Mediterranean-style recipe together as a couple. Use the app to plan meals that include olive oil, vegetables, whole grains, and fish. Share meal planning with your partner so both of you can track progress toward healthier eating patterns
- Use the app’s monthly nutrition reports to track alignment with Mediterranean Diet or Healthy Eating Index patterns. Set reminders for grocery shopping focused on whole foods rather than processed items. Review progress quarterly and adjust meal plans if needed to maintain consistency
This research applies specifically to couples undergoing fertility treatment and may not reflect outcomes for couples trying to conceive naturally. The improvements in pregnancy rates were modest, and diet is just one of many factors affecting fertility. This information is not a substitute for medical advice from a fertility specialist or healthcare provider. If you’re planning to become pregnant or have concerns about fertility, consult with a qualified healthcare professional who can evaluate your individual circumstances. Dietary changes should complement, not replace, medical fertility treatment and evaluation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.