Men who eat at least two servings a week of yogurt may be lowering their risk for colorectal cancer, a recent study suggests.
Researchers examined data on 32,606 male and 55,743 female health professionals who had a colonoscopy between 1986 and 2012. Study participants provided detailed information about their health, lifestyle, eating and exercise habits every four years.
Over that time, there were 5,811 cases of colorectal adenomas in men and 8,116 in women.
Compared to men who didn’t eat any yogurt, those who had at least two servings weekly were 19% less likely to develop conventional adenomas and 26% less likely to develop adenomas with the highest malignant potential.
“Our data provide novel evidence for the role of yogurt in the early stage of colorectal cancer development,” said study coauthor Dr. Yin Cao of Washington University School of Medicine in St. Louis.
“The findings, if confirmed by future studies, suggest that yogurt might serve as a widely acceptable modifiable factor, which could complement colorectal cancer screening and reduce risk of adenoma among the unscreened,” Cao said by email.
Yogurt consumption has been linked to a lower risk of colon and rectal cancer in previous studies, and some scientists think this may be because yogurt promotes the growth of healthy bacteria in the gut. But less is known about how yogurt might impact the potential for people to develop adenomas.
In the study, yogurt consumption didn’t appear to impact the risk of pre-cancerous polyps in women.
“However, because this study took into account calcium intake, among other dietary factors, these results suggest that yogurt may be lowering risk though an avenue other than calcium,” Colditz said by email.
The probiotics in yogurt may be helping.
“Though it’s not clear that probiotics help lower colon cancer risk, there are a number of possible ways they could,” Colditz said. “Probiotics may help reduce inflammation – a cancer risk factor – as well as bind and neutralize certain carcinogens in the colon.”
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