Swedish Study Finds Coffee May Lower Breast Cancer Risk

If you’re over 50 and concerned about breast cancer risk, you’ve likely wondered whether lifestyle choices—like your morning coffee habit—could make a difference. A major study from Sweden offers some concrete answers.

Women over 50 who drink five or more cups of coffee per day see a 20% lower overall risk of breast cancer, and those who regularly consume coffee have more than a 50% reduced risk of ER-negative breast cancer, a particularly hard-to-treat form. These findings come from a study of nearly 5,000 women aged 50 and older, conducted by researchers at the Karolinska Institute.

What the Swedish Study Found

Published in the journal Breast Cancer Research and reported by the UK’s Daily Telegraph on May 11, the Swedish study analyzed data from nearly 5,000 women aged 50 and above. Researchers at the Karolinska Institute investigated their coffee consumption habits alongside their medical histories.

The key results include:

• Women drinking five or more cups of coffee daily had a 20% lower overall risk of developing breast cancer.
• Regular coffee drinkers showed a 57% reduction in the risk of ER-negative breast cancer.

ER-negative breast cancer is both less common and more difficult to treat compared to other types.

Why Coffee Might Help

While the exact mechanism isn’t yet clear, researchers suggest that antioxidants in coffee may play a significant role. Coffee is rich in compounds that combat oxidative stress, which is thought to contribute to cancer development. These antioxidants might help regulate cell behavior and reduce inflammation, although further research is needed to confirm how these processes specifically affect breast cancer risk.

Who Benefits Most

The protective effect was most pronounced in women over 50. This age group faces a higher baseline risk of breast cancer, making the potential impact of lifestyle factors like coffee consumption especially relevant. The study focused exclusively on this demographic, highlighting the importance of targeted prevention strategies as women age.

Frequently Asked Questions

How many cups of coffee reduce breast cancer risk according to the Swedish study?

Drinking five or more cups of coffee per day was associated with a 20% lower overall risk of breast cancer in women over 50, according to the Karolinska Institute study published in Breast Cancer Research.

What type of breast cancer saw the biggest risk reduction?

ER-negative breast cancer risk was reduced by more than 50% among regular coffee drinkers. This type is less common and harder to treat than ER-positive breast cancer.

Does the study suggest coffee prevents all types of breast cancer?

No, the study found the strongest risk reduction for overall breast cancer and specifically for ER-negative breast cancer. The effect on other subtypes was not as clearly defined in this research.

Why might coffee lower breast cancer risk?

Researchers believe antioxidants in coffee may reduce oxidative stress and inflammation, which could help prevent cancer cell development, though the exact biological pathway remains under investigation.

Is this effect only seen in women over 50?

Yes, the study focused on women aged 50 and older, where the risk of breast cancer is higher, and the protective effect of coffee was most significant in this age group.

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