Nutrition and Fertility: What the Evidence Says

Diet won't override biology, but the evidence points to real, modest gains from a few sensible habits. Here's what's worth doing — and what isn't.

It's tempting to look for a "fertility superfood," but that isn't how the science works. No single food will make or break your chances. What the evidence does support is the value of an overall dietary pattern — and a few specific, well-studied habits.

The strongest signal comes from Mediterranean-style eating: plenty of vegetables, fruit, whole grains, legumes, nuts, fish and olive oil, with less red and processed meat. Studies in couples undergoing fertility treatment associate this pattern with better outcomes. It is rich in the antioxidants, healthy fats and folate that reproductive health draws on.

Folic acid deserves a special mention. Every woman trying to conceive should take a daily folic acid supplement (typically 400 micrograms, higher if advised) before conception and through early pregnancy — not to boost fertility as such, but because it sharply reduces the risk of neural-tube defects in the baby. This is one of the few supplement recommendations backed by very strong evidence.

Body weight matters at both ends of the scale. Being significantly underweight or overweight can disrupt ovulation and hormone balance, and even a modest move toward a healthier weight can restore more regular cycles in some women. For men, weight and lifestyle affect sperm quality too.

A few things are worth limiting: heavy alcohol intake, smoking (which harms egg and sperm quality and is best stopped entirely), and very high caffeine consumption — most guidance suggests keeping caffeine to roughly one or two cups of coffee a day. Trans fats and heavily processed, sugary diets are associated with poorer outcomes.

Be cautious about expensive supplement "protocols" promising dramatic results — most lack solid evidence. The sensible, evidence-based message is reassuringly simple: eat well overall, take your folic acid, move regularly, don't smoke, and keep alcohol and caffeine modest. If you have a condition such as PCOS, targeted dietary advice from your team can help further.

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