Research shows that women who follow a planetary health diet, which emphasizes plant-based foods and limits meat and processed items, report significantly lower rates of infertility. According to Gram Research analysis of 2,256 American women, those in the highest diet adherence group had 46% lower odds of reporting infertility compared to those in the lowest group. However, this cross-sectional study cannot prove the diet causes better fertility, only that the two are associated.
A new study of over 2,200 American women found that those who followed a planetary health diet, which emphasizes plant-based foods and limits meat and processed items, reported fewer fertility problems. According to Gram Research analysis, women who scored highest on the Planetary Health Diet Index had about half the odds of reporting infertility compared to those who ate the least healthy way. However, researchers note this was an exploratory study that can’t prove the diet causes better fertility, only that the two seem connected. The findings suggest that eating in ways that are good for both our bodies and the environment might also support reproductive health.
Key Statistics
A 2026 cross-sectional analysis of 2,256 American women found that those scoring highest on the Planetary Health Diet Index had odds of infertility 46% lower than women scoring lowest, with an odds ratio of 0.536.
Among 2,256 women aged 18 to 44 in the 2013-2018 National Health and Nutrition Examination Survey, 310 reported infertility, representing about 13.7% of the study population.
A 10-point increase in Planetary Health Diet Index score was associated with an 11% reduction in odds of infertility, though this continuous association was imprecisely estimated and not statistically significant.
The Quick Take
- What they studied: Whether eating a diet that’s good for the planet is connected to better fertility in women
- Who participated: 2,256 American women aged 18 to 44 years old who answered questions about their diet and reproductive health as part of a national health survey from 2013 to 2018
- Key finding: Women who followed the Planetary Health Diet most closely had about 46% lower odds of reporting infertility compared to women who followed it least closely
- What it means for you: Eating more plant-based foods and fewer processed foods might support fertility, though this study can’t prove cause and effect. Talk to your doctor before making major diet changes if you’re trying to conceive.
The Research Details
Researchers looked at information from a large national health survey where women answered questions about what they ate over two days and whether they had trouble getting pregnant. They scored each woman’s diet based on how well she followed the Planetary Health Diet, which recommends eating mostly plants, whole grains, nuts, and legumes while limiting red meat, processed foods, and added sugars. The researchers then looked for connections between diet scores and reported infertility, adjusting for other factors like age, income, and overall body size.
This type of study, called cross-sectional, takes a snapshot in time rather than following people over months or years. It’s useful for spotting patterns but can’t prove that one thing causes another. The researchers used advanced statistical methods to account for the complex survey design and to explore whether body weight and shape might explain any connection between diet and fertility.
This approach matters because it uses real-world data from a representative sample of American women rather than a small laboratory study. By looking at multiple measures of body size and shape, the researchers could explore different ways the diet might affect fertility. However, the cross-sectional design means we can’t know if better diet led to better fertility, or if women with fertility problems changed their diets, or if other factors explain both.
Strengths of this study include its large sample size and use of national survey data that represents diverse American women. The researchers carefully adjusted for many factors that could affect the results. Weaknesses include relying on women’s memory of what they ate and their self-reported fertility problems, which may not be completely accurate. The study also couldn’t prove cause and effect, and some of the statistical findings were imprecise, meaning the true effect could be different from what was observed.
What the Results Show
Among the 2,256 women studied, 310 reported having infertility. Women who scored in the highest quarter for following the Planetary Health Diet had significantly lower odds of reporting infertility compared to those in the lowest quarter. Specifically, the odds of infertility were about 46% lower for women eating the most planet-friendly diet.
When researchers looked at the diet score as a continuous measure (meaning they compared each 10-point increase in the score), the association was weaker and less certain. This suggests that the biggest difference appears when comparing women who follow the diet very well versus those who don’t follow it at all, rather than small changes in diet quality.
The researchers also explored whether body weight and shape might explain the connection between diet and fertility. They looked at four different ways to measure body size, but the results were unclear and imprecise, meaning they couldn’t confidently say that body size was the reason for the diet-fertility connection.
The study found no clear pattern showing that the diet effect gets stronger or weaker at different levels of adherence. This means the relationship between diet quality and fertility doesn’t follow a simple straight line. The exploratory analysis of body measurements suggested possible indirect effects through weight and body shape, but these findings were too uncertain to draw firm conclusions.
This is one of the first studies to look at the Planetary Health Diet specifically in relation to fertility. Previous research has shown that overall diet quality matters for reproductive health, and that plant-based eating patterns may support fertility. This study adds to that evidence by examining a specific diet framework designed for both human and environmental health. However, most fertility diet research has focused on individual nutrients or food groups rather than whole dietary patterns.
This study has several important limitations. First, it’s cross-sectional, so it captures only one moment in time and can’t prove that diet causes better fertility. Second, women reported their own diets and fertility problems, which may not be completely accurate. Third, the study couldn’t account for other important fertility factors like whether women were actively trying to conceive, their partner’s health, or medical conditions affecting fertility. Fourth, some of the statistical findings were imprecise, meaning the true effect could be quite different from what was observed. Finally, the researchers note that more research is needed to understand whether the diet actually improves fertility or if other factors explain the connection.
The Bottom Line
Based on this exploratory research, eating a diet rich in plants, whole grains, nuts, and legumes while limiting red meat and processed foods appears to be associated with better fertility outcomes. However, this study cannot prove the diet causes better fertility. If you’re trying to conceive, consider discussing dietary changes with your doctor or a registered dietitian. The Planetary Health Diet also benefits the environment, making it worth considering for multiple reasons. Confidence level: Low to moderate, as this is exploratory research that needs confirmation with longer-term studies.
Women of reproductive age who are trying to conceive or concerned about fertility may find this research relevant. The findings also matter for anyone interested in eating in ways that support both personal and planetary health. However, this study should not replace medical advice from a fertility specialist or doctor. Men and people with other reproductive concerns should note that this study only looked at women.
If diet does affect fertility, changes would likely take weeks to months to show effects, as the body needs time to adjust to new eating patterns. However, this study can’t tell us how long it would take to see benefits. Anyone trying to conceive should discuss realistic timelines with their healthcare provider.
Frequently Asked Questions
Does eating a planetary health diet improve fertility in women?
Research suggests an association between higher planetary health diet adherence and lower infertility rates, but this study cannot prove cause and effect. Women scoring highest on diet adherence had 46% lower odds of reporting infertility. Prospective studies are needed to confirm whether diet actually improves fertility.
What is the planetary health diet and how does it work for fertility?
The planetary health diet emphasizes plant-based foods, whole grains, nuts, and legumes while limiting red meat and processed foods. It’s designed to benefit both human health and the environment. The mechanism by which it might support fertility is unclear, though body weight and composition may play a role.
How many women were studied and what did they find?
Researchers studied 2,256 American women aged 18 to 44 from national health surveys conducted between 2013 and 2018. Among them, 310 reported infertility. Women following the diet most closely had significantly lower odds of infertility compared to those following it least closely.
Can I use this diet to treat infertility?
This study shows an association but cannot prove the diet treats infertility. If you’re experiencing fertility concerns, consult a healthcare provider or fertility specialist. Diet may be one factor among many affecting reproductive health, but medical evaluation is essential.
How long would it take to see fertility benefits from changing my diet?
This study doesn’t specify a timeline for benefits. If diet affects fertility, changes would likely take weeks to months as your body adjusts. Discuss realistic expectations with your doctor, as many factors beyond diet influence fertility.
Want to Apply This Research?
- Track your Planetary Health Diet Index score weekly by logging your meals and noting your intake of plant-based foods, whole grains, nuts, legumes, and processed foods. Calculate a simple score based on the proportion of each food group consumed.
- Start by adding one plant-based meal per week and gradually increase to two or three. Replace one serving of red meat per week with legumes or nuts. Use the app to set reminders for meal planning that emphasizes whole grains and vegetables.
- Monitor your diet adherence monthly and track any changes in energy, digestion, or other health markers. If trying to conceive, keep a separate log of cycle tracking or fertility indicators alongside your dietary data to look for patterns over 3 to 6 months.
This research is exploratory and cross-sectional, meaning it cannot prove that diet causes changes in fertility. The findings are based on self-reported data and should not replace professional medical advice. If you are experiencing infertility or planning to conceive, consult with a healthcare provider, fertility specialist, or registered dietitian before making significant dietary changes. This article is for informational purposes only and does not constitute medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.