A recent UK study published in Nature suggests a link between calcium intake and a reduced risk of colorectal cancer in women. The research indicates that consuming approximately 300 mg of calcium daily, roughly equivalent to a glass of milk, could lower the risk of developing this type of cancer by 17%.
The Study’s Findings on Dairy and Calcium
The study, conducted by Oxford University and Cancer Research UK, observed a correlation between the consumption of dairy products and a decreased risk of colorectal cancer. This includes milk, cheese, and overall dairy intake, with calcium supplements also showing a potential protective effect. Lead researcher Dr. Keren Papier, as quoted by the BBC, emphasized the possible role of dairy, primarily due to its calcium content, in mitigating the development of bowel cancer.
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The researchers arrived at these conclusions after analyzing the dietary habits and health outcomes of over 542,000 women over a 16-year period. However, they cautioned against assuming that any dairy product offers protection. The study found that cheese and ice cream did not exhibit the same inverse association with colorectal cancer risk as other dairy products.
Calcium’s Protective Mechanism
The study proposes that calcium’s protective effect might stem from its ability to bind with bile acids and free fatty acids in the colon. This binding action could potentially neutralize the carcinogenic properties of these substances. The researchers concluded that dairy products, particularly due to their calcium content, contribute significantly to lowering colorectal cancer risk.
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Other Dietary Factors and Colorectal Cancer Risk
In addition to dairy and calcium, the research also explored the impact of other dietary factors on colorectal cancer risk. The findings revealed an 8% increase in risk associated with higher consumption of red and processed meats, with processed meat showing a stronger correlation than red meat. Alcohol consumption was also linked to a 15% elevated risk.
Calcium Sources for Non-Dairy Consumers
While the study focused on dairy milk as a primary calcium source, Dr. Lisa Wilde of Bowel Cancer UK highlighted alternative options for individuals who avoid animal products. She noted that non-dairy sources like broccoli and tofu can also provide sufficient calcium intake to potentially reduce colorectal cancer risk.
