Coffee consumption and cancer risk
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Coffee Consumption and Overall Cancer Risk
Multiple large-scale analyses show that regular coffee consumption is linked to a lower overall risk of developing cancer. People who drink coffee regularly have about a 13% lower risk of cancer compared to those who rarely or never drink it, and each additional cup per day is associated with a small further reduction in risk Yu2011Wang2016. However, some studies find no significant association between coffee and overall cancer risk, suggesting that the effect may depend on the type of cancer and other factors .
Coffee and Specific Cancer Types
Liver Cancer and Hepatocellular Carcinoma
There is strong and consistent evidence that coffee consumption is associated with a reduced risk of liver cancer, particularly hepatocellular carcinoma. This protective effect is supported by both observational studies and genetic (Mendelian randomization) analyses Pauwels2021Yu2011Nkondjock2009+3 MORE.
Colorectal Cancer
Several studies report that coffee drinkers have a lower risk of colorectal cancer, with a clear dose-response relationship: the more coffee consumed, the lower the risk. This benefit is seen for both regular and decaffeinated coffee, and for both colon and rectal cancers Yu2011Kunutsor2024Wang2016+1 MORE. However, some reviews note that the evidence is stronger in case-control studies than in cohort studies .
Endometrial, Prostate, and Other Cancers
Coffee intake is linked to a reduced risk of endometrial and prostate cancers, as well as oral, pharyngeal, and melanoma cancers in several meta-analyses Yu2011Kunutsor2024Wang2016. The evidence for breast cancer is less clear, with some studies suggesting a slight reduction in risk, especially among postmenopausal women Pauwels2021Yu2011Nkondjock2009. For kidney cancer, some studies suggest a protective effect, but results are inconsistent Nkondjock2009Kunutsor2024.
Cancers with Unclear or No Association
For cancers of the pancreas, ovary, bladder, and esophagus, the evidence is mixed or inconclusive, with some studies showing no significant association between coffee consumption and risk Pauwels2021Nkondjock2009Kunutsor2024+1 MORE. For many other cancer types, including stomach, brain, thyroid, and lymphohematopoietic cancers, data are limited and do not show a clear link .
Coffee and Lung Cancer Risk
The relationship between coffee and lung cancer is complex. Some studies find that high coffee consumption is associated with an increased risk of lung cancer Wang2016Tang2009. However, more recent and detailed analyses show that this association disappears when adjusting for smoking and body mass index (BMI), suggesting that the apparent risk is likely due to confounding by smoking, as smokers tend to drink more coffee Kunutsor2024Tang2009Jin2024. In non-smokers, coffee does not appear to increase lung cancer risk Tang2009Jin2024.
Biological Mechanisms: Why Might Coffee Protect Against Cancer?
Coffee contains many bioactive compounds, such as caffeine, chlorogenic acids, and diterpenes, which have antioxidant and anti-inflammatory properties. These compounds may help reduce oxidative stress, inhibit cancer cell growth, and influence hormone levels, all of which could contribute to a lower cancer risk Pauwels2021Nkondjock2009Kunutsor2024.
Limitations and Uncertainties
Despite the promising findings, there are important uncertainties. Differences in study design, population characteristics, coffee preparation methods, and confounding factors like smoking and alcohol use make it difficult to draw firm conclusions for all cancer types Pauwels2021Kunutsor2024Alicandro2017. Genetic studies (Mendelian randomization) generally do not support a strong causal relationship for most cancers, though they do suggest possible protective effects for liver and colorectal cancers Carter2022Kunutsor2024.
Conclusion
Overall, current evidence suggests that coffee consumption is associated with a reduced risk of several cancers, especially liver and colorectal cancers, and possibly endometrial, prostate, and some other types. The apparent increased risk of lung cancer is likely due to confounding by smoking. Coffee’s protective effects are thought to be due to its antioxidant and anti-inflammatory compounds. However, more research is needed to clarify the effects for many cancer types and to better understand the underlying mechanisms.
Sources and full results
Most relevant research papers on this topic
Coffee consumption and risk of cancers: a meta-analysis of cohort studies
A cup of coffee per day is associated with a 3% reduced risk of various cancers, including bladder, breast, colorectal, endometrial, esophageal, hepatocellular, leukemic, pancreatic, and prostate cancers.
Coffee consumption, cancer, and healthy aging: epidemiological evidence and underlying mechanisms
Coffee consumption may reduce the risk of several cancers and may lower cancer recurrence rates, but its relationship with cancer risk remains complex and inconclusive.
Coffee Consumption and the Risk of Colorectal Cancer
Increasing coffee consumption is associated with a lower risk of colorectal cancer, with a dose-response relationship observed for both colon and rectal cancers.
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