6 Health Risks of Drinking Too Much Coffee for Women

If you’re a woman who drinks coffee regularly—whether for energy, socializing, or work—you might want to reconsider how much you’re having. Medical experts have long debated coffee’s impact on female health, and recent studies highlight several serious risks linked to high consumption.

In short: drinking more than one cup of coffee per day can increase your risk of infertility, heart attack, and bone loss. Pregnant women face additional dangers, including higher chances of birth defects and pregnancy-induced hypertension. More than five cups daily? That’s been tied to a 70% greater risk of heart trouble.

1. Increased Risk of Infertility

Research shows that women who drink one cup of coffee per day are more likely to experience infertility compared to non-coffee drinkers. A study of 104 coffee-drinking women found that nearly 50 had difficulty conceiving. While some experts call the sample small, others warn that when no other cause for infertility is found, caffeine could be a contributing factor.

2. Higher Risk of Heart Attack

A four-year study by Boston University public health researchers tracked 858 women aged 45–69 who experienced their first heart attack and compared them with 858 women who had not. Results showed that women who drank five or more cups of coffee daily had a 70% higher risk of myocardial infarction—and the risk grew along with coffee intake.

3. Weakened Bones and Osteoporosis

University of California researchers surveyed 980 women aged 50–98 and found that those who habitually drank more than two cups of coffee daily—without balancing it with milk—showed reduced bone density in the hips and spine. This loss correlated with both the amount of coffee consumed and how long the habit had lasted. Caffeine binds to free calcium in the body and flushes it out through urine, leading to decreased bone mineral density over time.

4. Pregnancy and Birth Defects

As early as the 1980s, U.S. FDA researcher Dr. Koehler found that mice given the human equivalent of 12–24 cups of strong coffee daily gave birth to offspring with deformities. In light of these findings, the FDA has advised pregnant women to avoid coffee during pregnancy.

5. Hypertension in Pregnancy

Pregnancy-induced hypertension, or preeclampsia, includes symptoms like swelling, high blood pressure, and protein in urine—and it threatens both mother and baby. Australian research has shown that even a few cups of coffee per day can raise blood pressure. For that reason, expectant mothers are discouraged from drinking coffee.

6. Link to Diabetes

Studies from Finland and the United States, two of the top coffee-consuming nations, show those countries also have among the highest diabetes rates. Finland leads the world in both coffee intake and diabetes cases. Meanwhile, Japan has the lowest coffee consumption and the lowest diabetes prevalence. Researchers suggest caffeine may accumulate in fetal liver and brain tissue, possibly increasing later risk of diabetes in children.

Frequently Asked Questions

How many cups of coffee per day are considered too many for women?

More than one cup per day is linked to increased infertility risk, while five or more cups daily raises heart attack risk by 70%. Avoiding more than two cups without milk is also advised to protect bone density. Pregnant women are recommended to stop drinking coffee entirely.

Can coffee affect fertility in women?

Yes. Studies show women who drink one cup of coffee daily are more likely to face infertility. Out of 104 coffee-drinking women studied, nearly 50 had difficulty conceiving, and some experts link this to caffeine when no other causes are found.

Does coffee intake during pregnancy cause birth defects?

Animal studies found that very high caffeine doses (equivalent to 12–24 cups of coffee per day for humans) led to birth defects in mice. Based on this, the FDA advises pregnant women to pause coffee consumption to reduce risks.

Why does coffee increase the risk of osteoporosis?

Coffee causes the body to flush out free calcium via urine. Over time, especially with two or more cups daily and without milk, this leads to reduced bone mineral density in areas like the hips and spine, increasing osteoporosis risk.

Is coffee consumption linked to diabetes?

Finland and the U.S., which have the highest coffee intake, also report the highest diabetes levels. Some researchers hypothesize caffeine may affect fetal tissues and contribute to diabetes risk later in life, although more evidence is needed.

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