The Fertility Diet: Foods That Boost Conception and Foods to Avoid

The fertility diet: what the evidence actually shows

The honest starting point

No specific diet has been shown to improve conception rates, and I am not aware of a guideline that recommends one. Content claiming otherwise generally rests on observational studies where diet is entangled with weight, income, exercise and health behaviour generally.

What follows is what can reasonably be said.

Where diet clearly matters

Through weight. A BMI above 30 is associated with irregular ovulation and poorer treatment outcomes; significantly underweight suppresses ovulation. Diet matters here because it affects weight, not because particular foods affect fertility directly.

In PCOS, 5 to 10% weight loss can restore ovulation without medication.

Through insulin resistance. In PCOS — renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026 — insulin resistance with compensatory high insulin is present in 85% of those affected. Reducing refined carbohydrates and sugar addresses this directly, and both resistance and aerobic training improve insulin sensitivity independently of weight loss.

Through correcting deficiency. Vitamin D deficiency is worth correcting. Iron deficiency, common with heavy periods, is worth treating.

Folic acid — the one clear recommendation

At least 400 micrograms daily, started before conception rather than after a positive test. The neural tube closes very early, so starting once pregnancy is confirmed is too late for its primary purpose.

This is about the baby rather than about conceiving.

What is oversold

Specific "fertility superfoods". Restrictive elimination protocols. Expensive supplement stacks — a Cochrane review of 90 trials in male subfertility found a possible live birth benefit that disappeared when poor-quality studies were removed.

Anything promising to "boost egg quality". Egg quality tracks with age, and no dietary intervention has been shown to change it.

For the male partner

Same principles, plus the three-month timescale — sperm production takes roughly 72 to 90 days, so any change needs that long to show in a repeat analysis.

A caution on traditional preparations

If you use Ayurvedic or other traditional preparations, source them from licensed manufacturers with proper labelling. Unregulated products have been found to contain heavy metals including lead and mercury. Tell your doctor everything you take — some interact with fertility medications or affect test results.

The practical version

Eat reasonably. Address weight if it is relevant to you. Take folic acid. Correct deficiencies. Do not spend money on protocols promising to improve egg quality.

And do not let dietary optimisation delay assessment. If you have been trying for the recommended period, get investigated alongside.