Fertility Foods for Women: What the Evidence Actually Supports

No single food improves fertility. A 2023 systematic review in Human Reproduction Update examined 36 studies of preconception diet and female fertility and concluded there is insufficient evidence to support any specific dietary approach. What did emerge is that overall eating patterns matter more than individual foods: a Mediterranean-style diet showed the strongest and most consistent association with improved clinical pregnancy rates, and reducing trans fats, fast food and sugar-sweetened drinks was associated with better outcomes. This article sets out what that evidence supports and what it does not.

Which dietary pattern has the best evidence?

A Mediterranean-style pattern. In the review above it was the dietary approach with the strongest and most consistent association with improved clinical pregnancy rates. In practice that means a diet built around vegetables, fruit, whole grains, legumes, nuts, olive oil and fish, with limited processed food and red meat.

The reason to think in terms of patterns rather than individual foods is that this is how the research is done and how the effect appears. Studies that look for the effect of one food or one nutrient in isolation return conflicting results far more often than studies that look at the whole diet.

What is worth reducing?

• Trans fatty acids. Reducing them was associated with improvements in live birth and clinical pregnancy rates, one of the clearer findings in the review.
• Fast food and sugar-sweetened drinks. Limiting these was associated with better outcomes.
• Alcohol and high caffeine intake. The American Society for Reproductive Medicine advises reducing both while trying to conceive, and avoiding smoking and recreational drugs.

Replacing some animal protein with vegetable protein also showed a benefit in some of the studies reviewed.

What about specific foods like fish, dairy and soy?

This is where the honest answer differs from most advice online. The review found the evidence for seafood, dairy and soy products inconsistent, with conflicting results across studies. The same was true of individual micronutrients.

That does not make them bad choices. Fish, dairy and legumes are part of the Mediterranean pattern that did show a consistent association. It means the case for eating any one of them specifically to improve fertility is not established, and any source telling you that a particular food nourishes the ovaries or stimulates ovulation is going beyond what the evidence supports.

Does diet matter as much for men?

The evidence base for men is somewhat stronger. A separate systematic review in Human Reproduction Update linked a healthy dietary pattern to better semen quality and better pregnancy rates. Since conception involves both partners, this is worth attention on both sides rather than treating diet as the woman's responsibility. Our article on foods that nourish sperm covers that evidence.

What matters more than diet?

Age is the largest single factor and diet does not offset it. The American College of Obstetricians and Gynecologists sets out how aging affects fertility and pregnancy. Smoking, body weight and untreated conditions such as thyroid disorders or endometriosis also carry more weight than any food choice.

The most useful thing to know is when to stop optimizing on your own. The NICE guideline on fertility problems puts the usual threshold at twelve months of trying, with earlier assessment where the woman is 36 or over, or where periods are irregular or there is a known reproductive health problem.

We at Millennium IVF Clinic investigate both partners to find a cause rather than treating on assumption. You can arrange a consultation with our team.

Frequently asked questions

Can changing my diet fix infertility?

No. Diet is associated with outcomes but it is not a treatment. If you have been trying for twelve months, or six to twelve months if you are 36 or over, an assessment is more useful than further dietary change.

Do any foods improve egg quality?

No food has been shown to improve egg quality. Claims that a specific food nourishes the ovaries or produces better eggs are not supported by the evidence reviewed above.

Should I take supplements instead?

The review found evidence for individual micronutrients inconsistent. Folic acid before and during early pregnancy is a separate and well-established recommendation for preventing neural tube defects, not a fertility treatment. Discuss any supplement with your doctor.

How long before trying should I change my diet?

The research looks at preconception diet over months rather than weeks, so earlier is better. There is no evidence supporting a short pre-cycle diet as a way to improve outcomes.