Exercise, caffeine, alcohol & fertility

“Can I keep my coffee? Do I have to cut out alcohol completely? Is the gym bad for me?” These are among the most common questions we hear from couples trying to conceive.

The answers are more reassuring than people fear. The key is moderation, not deprivation — and avoiding the real extremes.

Does exercise help fertility?

Yes, regular, moderate physical activity is beneficial. It helps maintain a healthy weight, improves insulin sensitivity — particularly useful in polycystic ovary syndrome — and supports mental wellbeing, which is far from trivial on a demanding journey.

For most women, moderate exercise (walking, swimming, gentle workouts) is a positive habit to keep up while trying to conceive.

Is there such a thing as “too much” exercise?

Yes, at the other extreme. Very intense and prolonged exercise can, in some women, disrupt ovulation — especially when combined with very low weight or inadequate energy intake. This mainly concerns high-level athletes rather than those who exercise moderately.

The message is not “stop exercising”, but “keep it moderate”. If your periods have become irregular or have stopped alongside heavy training, it is worth discussing this with your doctor.

How much caffeine is allowed?

Moderate caffeine intake is generally considered acceptable. A reasonable limit is about 200 mg a day, roughly one to two coffees. High intake (generally more than 5 cups a day) has been associated with reduced fertility, while in pregnancy excessive caffeine has been linked to a higher risk of miscarriage.

Remember that caffeine is found not only in coffee, but also in tea, cola-type soft drinks, energy drinks and chocolate. Keeping to a moderate amount is a simple, safe choice.

Do I have to cut out alcohol completely?

The effect of alcohol on female fertility has not been established with certainty, but high intake is associated with reduced chances. While trying to conceive, the sensible course is to substantially reduce alcohol.

In pregnancy itself the picture is clear: there is no known safe level of alcohol, and the recommendation is complete abstinence. Since pregnancy may not be noticed immediately, many couples choose to abstain already during the time they are trying.

What about the man?

The same principles apply to the man. Moderate exercise is positive; excess heat (saunas, hot baths, a laptop on the lap) and anabolic steroids harm sperm quality. Heavy alcohol use and smoking also affect sperm negatively.

Since sperm production takes about three months, positive lifestyle changes need a few months to show. Fertility is a matter for both partners.

What is the practical takeaway?

The practical message is simple and reassuring: moderate exercise yes; excessive, exhausting exercise no. Caffeine in moderation (up to ~200 mg). Substantially reduced alcohol, and abstinence in pregnancy. Smoking is the one factor genuinely worth stopping altogether.

You do not need to turn your life into a series of prohibitions. A few sensible adjustments are enough — and excessive strictness adds anxiety without a matching benefit.

Summary

For exercise, caffeine and alcohol, the key is moderation. Moderate exercise is beneficial; only excessive, exhausting exercise (mainly in low-weight athletes) can disrupt ovulation. Caffeine up to ~200 mg a day is considered acceptable. Alcohol is best substantially reduced while trying, with complete abstinence in pregnancy. Smoking is the factor genuinely worth stopping. The same principles apply to the man.

Sources: ASRM Practice Committee, “Optimizing natural fertility: a committee opinion”; NICE, Fertility problems: assessment and treatment (CG156).

⚕ Medically reviewed by Prof. Stratis Kolibianakis · Thessaloniki Medical Association Reg. No. 16340

ARTICLE 38 · PSYCHOLOGY & SUPPORT