6 Health Risks Women Should Know About Drinking Coffee

If you’re a woman who drinks coffee daily—whether one cup or five—you might want to reconsider how much you’re really consuming. Recent studies have flagged several health concerns specifically linked to regular coffee intake in women, from fertility issues to bone health. These aren’t just anecdotes; they come from controlled research and population studies with measurable outcomes.

The short answer? Women drinking more than one cup of coffee per day face heightened risks—including a 50% greater chance of infertility with just one daily cup, and up to 70% increased risk of heart attack when consuming five or more cups daily. Other documented concerns include reduced bone density, pregnancy complications, and links to diabetes. Read on for what the numbers really say.

1. Infertility Risk Starts With Just One Cup

Researchers found that women who drank one cup of coffee per day were more likely to experience infertility compared to non-coffee drinkers. In a study of 104 coffee-drinking women, nearly 50 (about half) reported difficulty conceiving. While some fertility experts caution that the sample size was small, researchers emphasized that when no other medical cause for infertility is found, caffeine should be considered a potential contributing factor.

2. Heart Attack Risk Rises Sharply With Five or More Cups

A four-year study by Boston University public health scientists tracked 858 women aged 45–69 who had experienced a first-time heart attack and compared them with 858 women who had not. The results were clear: women who drank five or more cups of coffee per day had a 70% higher risk of myocardial infarction. The risk increased along with coffee consumption—the more cups, the higher the danger.

3. Bone Density Loss From Daily Coffee Without Milk

Researchers at the University of California, Berkeley studied 980 women aged 50–98 and found that those who habitually drank two or more cups of coffee daily without consuming milk showed reduced bone mineral density in the hip and spine. This loss occurred regardless of age or body weight. The mechanism? Caffeine binds with free calcium in the body, which is then excreted. Over time, this leads to decreased levels of bound calcium and contributes to osteoporosis. The longer and more heavily women drank coffee without balancing it with calcium intake, the greater the bone density loss.

4. Pregnancy and Fetal Risks From Coffee Consumption

As early as the 1980s, U.S. FDA researcher Dr. Koehler conducted experiments showing that mice given the human equivalent of 12–24 cups of strong coffee per day gave birth to offspring with birth defects. Based on these findings, the FDA issued a caution advising pregnant women to avoid coffee during pregnancy. No safe level has been established for fetal exposure to high caffeine intake during development.

5. Increased Risk of Pregnancy-Induced Hypertension

Known as pregnancy-induced hypertension or preeclampsia, this condition includes symptoms like swelling, high blood pressure, and protein in urine—all of which threaten the health of both mother and fetus. Australian research has shown that even a few cups of coffee per day can raise blood pressure during pregnancy. Because of these risks, health authorities recommend that pregnant women avoid coffee altogether.

6. Possible Link Between Coffee and Diabetes Incidence

Finland and the United States, which have among the highest per capita coffee consumption in the world, also report some of the highest rates of diabetes. In contrast, Japan, with the lowest coffee intake, also has the lowest diabetes rates. Researchers hypothesize that caffeine in coffee may accumulate in pancreatic and fetal liver and brain tissues, potentially affecting glucose metabolism. Though this link is not yet fully proven, the correlation between national coffee consumption trends and diabetes prevalence is notable.

Frequently Asked Questions

How much coffee is too much for a woman trying to conceive?

Research shows that drinking even one cup of coffee per day is associated with a higher risk of infertility in women. In a study of 104 coffee-drinking women, nearly 50 experienced difficulty conceiving. While the study group was small, experts suggest that if no other medical cause is found, caffeine could be a contributing factor, especially at daily levels as low as one cup.

Can drinking five cups of coffee a day really increase my heart attack risk by 70%?

Yes. A long-term study involving 858 women aged 45–69 found that those who drank five or more cups of coffee daily had a 70% higher risk of heart attack compared to non-heavy drinkers. The risk increased alongside coffee intake, meaning more cups led to greater danger over a four-year follow-up period.

Why does coffee affect bone density in women?

Coffee contains caffeine, which binds to free calcium in the body and causes it to be excreted through urine. This loss of free calcium can lead to a breakdown of bound calcium, reducing overall bone mineral density. Studies of women over 50 who drank two or more cups daily without milk showed significant bone density loss in the hips and spine, particularly when calcium intake was insufficient.

Is it safe to drink coffee while pregnant?

No. Both early animal studies and human health advisories warn against coffee consumption during pregnancy. Research from the 1980s showed that high caffeine doses equivalent to 12–24 cups per day caused birth defects in mice. Human studies recommend avoiding coffee entirely during pregnancy due to risks of birth defects, miscarriage, and developmental issues.

Could coffee contribute to diabetes?

While not definitively proven, population studies show a correlation: countries with high coffee intake, like Finland and the U.S., also have high diabetes rates, whereas Japan, with low coffee consumption, has low diabetes rates. Researchers suggest caffeine may concentrate in organs like the pancreas and affect fetal liver development, possibly influencing diabetes risk, though more research is needed.

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