Drinking 5 Cups of Coffee Daily Cuts Female Fertility in Half

If you're trying to conceive and wondering whether your morning coffee habit is helping or hurting, new research provides a clear warning: drinking too much coffee can significantly reduce your chances of getting pregnant.

Women who consume five or more cups of coffee per day may have up to a 50% lower chance of becoming pregnant—especially during fertility treatments like IVF—according to a major Danish study presented at the 28th annual meeting of the European Society of Human Reproduction and Embryology (ESHRE).

The Study: Coffee Intake and Pregnancy Rates

Researchers at Aarhus University Hospital in Denmark, led by Dr. Ulrik S. Kesmodel, followed 3,959 women undergoing in vitro fertilization (IVF). They tracked participants’ daily coffee consumption alongside factors like age, smoking, alcohol use, and weight. The results were stark: women who drank five or more cups of coffee daily saw their probability of conceiving drop by half. This effect was not seen among those who drank fewer than five cups.

Why the Concern? Mixed Research on Coffee and Fertility

Past studies on coffee and fertility have shown inconsistent results. Some linked high caffeine intake to increased risk of miscarriage, while others found no significant impact. More recent consensus suggests that excessive consumption of caffeinated drinks—including both tea and coffee—can negatively affect a woman’s ability to conceive, especially when combined with other factors like male alcohol intake.

What Counts as ‘Too Much’? Caffeine Limits for Fertility

So how much coffee is safe when you’re trying to get pregnant? British fertility experts, including Dr. Euan Paul, recommend that women who are pregnant or actively trying to conceive limit their daily caffeine intake to 200 milligrams—that’s roughly equivalent to two standard cups of coffee. Going beyond this amount, particularly five or more cups daily, appears to substantially lower conception odds.

Frequently Asked Questions

How many cups of coffee reduce fertility by 50%?

According to a Danish study of 3,959 IVF patients, drinking five or more cups of coffee per day is associated with a 50% reduction in the likelihood of conceiving. This effect was not observed in women who drank fewer than five cups.

Is 200mg of caffeine the safe limit for trying to conceive?

Yes. UK fertility specialists recommend that women who are pregnant or planning to conceive keep their daily caffeine intake below 200mg, which typically equals about two cups of coffee. This helps maintain the best possible chance of conception.

Does decaf coffee have the same effect on fertility?

The study specifically measured regular coffee intake and did not isolate decaf. However, since decaffeinated coffee contains minimal caffeine, it is generally considered a safer alternative for those limiting intake to 200mg per day.

Are tea and other caffeinated drinks also risky during IVF?

Yes. Broader research indicates that excessive consumption of all caffeinated beverages—including tea—can lower fertility rates. Women undergoing fertility treatments are advised to monitor overall daily caffeine, not just from coffee.

Why does coffee reduce fertility in high amounts?

The exact mechanism isn’t specified in this study, but researchers suggest that high caffeine levels may interfere with hormonal balance, ovulation, or embryo implantation—especially in women undergoing IVF, where outcomes are highly sensitive to physiological conditions.

Low-Caffeine Coffee Options for Fertility-Conscious Drinkers

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