5 Cups of Coffee Daily Halves Female Fertility, Danish Study Finds

If you’re trying to get pregnant and can’t figure out why it’s taking longer than expected, your daily coffee habit might be part of the reason. A major new study presented at the 28th annual meeting of the European Society of Human Reproduction and Embryology (ESHRE) has found a clear link between high coffee consumption and reduced fertility in women — especially at levels many coffee lovers routinely hit.

The short answer: Women who drink five or more cups of coffee a day may have up to 50% lower chance of becoming pregnant, particularly during fertility treatments like IVF. Drinking fewer than five cups showed no negative impact on conception odds.

The Danish Fertility and Coffee Study

Researchers from Aarhus University Hospital’s fertility clinic in Denmark conducted a detailed study involving 3,959 women undergoing in vitro fertilization (IVF). Led by Dr. Ulrik S. Kesmodel, the team gathered data on each participant’s daily coffee intake alongside other lifestyle factors such as age, smoking, alcohol consumption, and body weight.

The key finding? Women consuming 5 or more cups of coffee daily had a 50% lower probability of conceiving compared to those who drank less. This effect was not seen among women who had fewer than five cups per day — suggesting a threshold effect around that level.

What Counts as One Cup of Coffee?

While the study did not define “one cup” by volume or caffeine content, standard assumptions in such research count a cup as roughly 240ml (8 ounces) and containing 95–200mg of caffeine depending on brew strength. Most commercial coffee servings fall within this range, meaning “five cups” likely delivers 475–1000mg of total caffeine — well above recommended limits for conception and pregnancy.

Why Coffee Might Affect Fertility

The exact biological mechanism isn’t fully understood, but caffeine is known to influence hormonal balance, ovarian response, and early embryo implantation. Prior studies on coffee and fertility have had mixed results: some linked high caffeine intake to increased risk of miscarriage, while others found no significant harm. More recent and controlled research, however, increasingly points to a negative association between excessive coffee or tea consumption and reduced conception rates — especially among women already facing fertility challenges.

How Much Caffeine Is Safe When Trying to Conceive?

British fertility experts, including Dr. Iain Paul, recommend that women who are pregnant or actively trying to conceive should limit daily caffeine intake to 200mg or less. That’s roughly equivalent to one to two average cups of brewed coffee. Going beyond this threshold — especially nearing or exceeding 400–500mg per day — appears to correlate with diminished fertility outcomes, as highlighted by the Danish study.

Frequently Asked Questions

Does drinking 5 cups of coffee a day really cut my chances of getting pregnant in half?

Yes, according to a 2012 Danish study presented at ESHRE, women who consumed 5 or more cups of coffee daily had up to a 50% lower chance of conceiving, especially among those undergoing IVF. This effect was not observed in women drinking fewer than 5 cups per day.

How many milligrams of caffeine are in 5 cups of coffee?

While the study didn’t specify caffeine amounts, a typical 8-ounce cup contains 95–200mg of caffeine. Five cups would total roughly 475–1000mg of caffeine — far above the 200mg safety threshold advised for conception.

Is the risk the same for all types of coffee?

The study looked at overall coffee intake without distinguishing brew methods. However, since caffeine content drives the effect, stronger brews or larger servings could contribute more caffeine per “cup,” increasing risk faster.

Does decaf coffee have the same effect on fertility?

Decaf contains minimal caffeine (usually under 5mg per cup), so it’s unlikely to affect fertility in the same way. The study focused on regular caffeinated coffee, not decaffeinated versions.

Should I stop drinking coffee completely when trying to conceive?

No — the study doesn’t say coffee is off-limits. It shows that keeping intake below 5 cups (about 200mg caffeine) per day is advisable. Many experts recommend staying under 200mg daily when trying to get pregnant.

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