Dairy may be linked to changes in reproductive hormones and ovulation, but current research does not show that eating or avoiding dairy reliably improves fertility. Milk, yogurt, cheese, and other dairy foods have been studied for their possible effects on the menstrual cycle. The findings are mixed, so most people do not need to eliminate dairy simply because they are trying to conceive.
If you are trying to become pregnant, you may wonder whether milk or other dairy products affect your chances of releasing an egg each month. Researchers have investigated this question, including whether the fat content of dairy matters. The evidence suggests that the overall relationship is more complicated than a simple choice between full-fat and low-fat products.
What does research say about dairy and ovulation?
Some studies have found associations between dairy intake and reproductive hormones or ovulatory infertility, while others have found little or no meaningful relationship. These differences make it difficult to conclude that dairy itself changes whether a person ovulates.
The American Society for Reproductive Medicine (ASRM) notes that evidence about normal dietary variations and natural fertility is limited. Although some observational research has suggested possible benefits from particular dietary patterns, there is not enough strong evidence to recommend a specific dairy intake as a way to improve natural fertility.
Does full-fat or low-fat dairy make a difference?
Researchers have explored whether the fat content of milk, yogurt, and other dairy products is associated with ovulation. The findings have attracted attention, but they do not establish that choosing one type of dairy over another will change your fertility.
A prospective study published in the journal Human Reproduction followed 18,555 women over eight years and examined dairy consumption in relation to infertility associated with ovulatory disorders. Higher low-fat dairy intake was associated with a greater risk of reported ovulatory infertility, while higher high-fat dairy intake showed a possible inverse association. However, this was an observational study, so it cannot prove that low-fat dairy causes ovulation problems or that full-fat dairy prevents them. The researchers also found no association between lactose intake and ovulatory infertility within the usual intake levels studied. The findings are available through PubMed.
Other research has not consistently confirmed these results. A study of women planning pregnancy in Denmark and North America found no clear association between either low-fat or high-fat dairy intake and the likelihood of becoming pregnant across the two groups. Its findings do not support the idea that high-fat dairy reliably improves fertility or that low-fat dairy harms it. Read the study on PubMed.
Can dairy change reproductive hormone levels?
Hormones such as estrogen and luteinizing hormone help regulate the menstrual cycle and the release of an egg. Because diet may be associated with hormone levels, researchers have examined whether dairy intake relates to these hormones and to occasional cycles in which ovulation does not occur.
A study published in the Journal of Nutrition followed 259 healthy, regularly menstruating women and assessed their dairy intake and reproductive hormones over two menstrual cycles. Greater dairy intake was associated with lower estradiol concentrations, but dairy intake overall was not associated with an increased risk of anovulation in the study. Some individual foods, including yogurt and cream, showed associations with sporadic anovulation. These findings do not establish that dairy caused the hormonal changes or that the results apply to everyone. The study is available through the National Library of Medicine.
Hormone levels naturally change throughout the menstrual cycle. A difference in a hormone measurement does not necessarily mean that ovulation has stopped or that fertility has been reduced. Research on dairy and reproductive hormones remains limited, and more studies are needed to understand whether the observed associations have practical effects on the ability to conceive.
Should you stop eating dairy when trying to conceive?
For most people, there is no evidence-based reason to stop eating dairy solely to improve ovulation. If you already tolerate dairy and enjoy it, you can generally continue including it in a balanced diet. There is also no reliable evidence that switching from low-fat to full-fat dairy, or the reverse, will by itself increase your chances of pregnancy.
Instead of focusing on a single food, consider your overall eating pattern, nutritional needs, and health. Dairy foods can provide nutrients such as protein and calcium, but these nutrients can also come from other foods or suitable fortified alternatives. If you avoid dairy because of an allergy, intolerance, personal preference, or dietary restriction, a healthcare professional or registered dietitian can help you plan an appropriate diet.
The ASRM guidance on natural fertility emphasizes that evidence is insufficient to recommend a particular diet or specific macronutrient intake as a reliable way to improve natural fertility. This means that dairy should be considered as one part of your overall diet rather than as a treatment for ovulation problems.
What if your periods are irregular or you are not ovulating?
Changes in menstrual patterns should not automatically be blamed on dairy. Ovulation can be affected by several factors, including polycystic ovary syndrome (PCOS), thyroid problems, changes in body weight, excessive exercise, and the transition toward menopause. Diet may be relevant to overall health, but eliminating a particular food is not a substitute for identifying the reason for persistent cycle changes.
The ASRM guidance on fertility evaluation explains that assessment of ovulatory function may involve menstrual history and, when appropriate, tests such as progesterone measurement, ovulation predictor kits, or ultrasound. The choice depends on the person's history and clinical circumstances.
Consider seeking medical advice if your periods become persistently irregular, stop unexpectedly, or you have concerns about whether you are ovulating. For people trying to conceive, fertility evaluation is generally recommended after 12 months of regular unprotected intercourse if younger than 35, after six months at age 35 or older, and sooner when there are known concerns or other reasons to seek assessment. A healthcare professional can help determine the appropriate next step.
How can you make practical dietary choices?
You do not need to follow a special dairy-based fertility diet. A practical approach is to choose foods that meet your nutritional needs and that you can comfortably maintain over time.
- Keep your diet balanced: Include a variety of vegetables, fruits, whole grains, protein sources, and foods that provide essential nutrients.
- Choose dairy according to your needs: Milk, yogurt, and cheese can fit into a balanced diet. There is no proven best dairy fat level for improving ovulation.
- Use suitable alternatives if needed: If you do not consume dairy, choose nutritionally appropriate alternatives, such as fortified products, and check their nutrient content.
- Avoid restrictive changes without a reason: Cutting out entire food groups may make it harder to meet nutritional needs unless you replace the nutrients they provide.
- Discuss supplements before taking them: If you are planning pregnancy, ask a healthcare professional about recommended preconception nutrition, including folic acid.
Most importantly, do not assume that changing dairy intake will correct irregular ovulation or resolve fertility difficulties. Dietary choices can support general health, but they cannot replace an appropriate assessment when conception is taking longer than expected.