IVF Diet: What to Eat Before and During Treatment

A Mediterranean-style diet — high in vegetables, fruit, whole grains, legumes, fish, and olive oil, and low in processed food, red meat, and sugar — is the eating pattern most consistently linked to better IVF outcomes in current research, according to a 2022 ASRM committee opinion. Evidence isn’t uniformly positive: while several cohort studies link this diet to higher pregnancy rates, at least one study found no significant association, so it should be treated as a reasonable, evidence-informed choice rather than a proven guarantee. Maintaining a healthy body weight, adequate folate intake, and avoiding alcohol and smoking are more firmly established recommendations than any single “fertility food.”

Foods Generally Encouraged During IVF

There’s no single “IVF diet” proven to guarantee success, but growing research suggests that eating patterns like the Mediterranean diet — rich in vegetables, whole grains, fish, and healthy fats — are associated with better IVF outcomes compared with a typical Western diet high in processed food and red meat. 

Diet is one piece of a much bigger picture that includes age, egg and sperm quality, and the specific fertility issue being treated, so it should be seen as a supportive habit, not a guaranteed fix.

Key Nutrients That Come Up in Fertility Nutrition Research

• Folate/folic acid — well-established for preventing neural tube defects; adequate intake is recommended before and during pregnancy attempts.
• Vitamin D — some research associates sufficient vitamin D status with reproductive outcomes, though evidence for supplementation specifically to boost IVF success is still developing.
• Omega-3 fatty acids — found in fish; some studies link higher intake to improved embryo development, though this isn’t established as a guaranteed benefit.
• Iron and B12 — relevant for overall health and are commonly reviewed as part of preconception bloodwork.

Supplement needs vary by individual, and taking supplements beyond what your fertility team recommends is not automatically beneficial and, in some cases, can interact with medications. Ask your clinic before starting anything new.

What Does a Normal BPD Range Indicate?

The BPD ranges vary depending on your stage of pregnancy. Here’s a rough guide to what normal ranges might look like:

• At 20 weeks gestation: BPD typically measures around 4.4 to 4.7 cm. 
• At 28 weeks gestation: BPD increases to approximately 7.2 to 7.6 cm. 
• At 36 weeks gestation and beyond: The measurement reaches about 8.6 to 9.6 cm.

A BPD within these ranges indicates healthy and consistent fetal brain and skull growth. However, the healthcare provider also interprets this result alongside other fetal measurements, such as the head circumference (HC), abdominal circumference (AC), and femur length (FL), for a complete view of your baby’s development.

Does Diet Actually Affect IVF Success?

Diet is one of several modifiable factors that may influence IVF outcomes, alongside body weight, smoking, alcohol use, and stress management. ASRM’s 2022 committee opinion on optimizing natural fertility notes that couples with higher adherence to a Mediterranean or similar “pro-fertility” dietary pattern before treatment showed higher rates of positive pregnancy tests and, in some studies, live birth. One frequently cited cohort study found the Mediterranean diet increased the probability of pregnancy in couples undergoing IVF/ICSI, with an odds ratio of 1.4.

That said, the evidence isn’t unanimous. A separate cohort study found no significant association between Mediterranean diet adherence and IVF success. Most of this research is observational, meaning it shows a pattern, not proof that diet directly causes better outcomes — other factors, like overall health consciousness, could play a role too. This is why fertility specialists generally frame diet as a supportive factor worth optimising, rather than a treatment in itself.

Foods and Habits Generally Limited or Avoided

Mediterranean Diet vs Western Diet for IVF

Does Body Weight Matter for IVF?

Body weight — both underweight and higher-weight ranges — can influence hormone levels and ovarian response to stimulation medications. Rather than focusing on a specific number, most fertility teams assess weight as one factor alongside ovarian reserve testing and overall health, and may suggest gradual, medically supervised changes if relevant to your specific treatment plan.

Does the Male Partner’s Diet Matter Too?

Yes — sperm quality can be influenced by diet, weight, and lifestyle factors like smoking and alcohol. Research on the Mediterranean diet and similar patterns generally studies couples together, since both partners’ health can affect IVF outcomes. If your partner is also preparing for treatment, the same general principles — more whole foods, less processed food and alcohol — are commonly recommended.

Practical Steps: Building an IVF-Friendly Plate

1. Fill half your plate with vegetables at most meals.
2. Swap refined grains for whole grains where practical (brown rice instead of white, whole wheat instead of white bread).
3. Include fish twice a week where possible, choosing lower-mercury options.
4. Use olive oil as your main cooking fat where suitable for your cooking style.
5. Limit sugary drinks and highly processed snacks, replacing them with fruit, nuts, or plain yogurt.
6. Check your folic acid intake with your doctor, since needs may differ from general population guidance.
7. Talk to your clinic about alcohol and caffeine limits specific to your treatment stage.

When to Talk to a Dietitian or Fertility Specialist

Consider asking for a referral to a registered dietitian if you have a specific condition like PCOS, diabetes, a diagnosed nutrient deficiency, disordered eating, or if you’re finding it hard to make sustainable changes on your own. A dietitian can tailor recommendations to your bloodwork and treatment plan rather than relying on general advice alone. 

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