The best of EcoWatch, right in your inbox. Sign up for our email newsletter!
Eating Lots of Dairy May Increase Prostate Cancer Risk, But Plant-Based Diets Reduce It, Study Finds
Dairy products are usually the leading source of calcium in Western countries. fcafotodigital / E+ / Getty Images
In a new study published in The Journal of the American Osteopathic Association, Mayo Clinic researchers found that eating a lot of dairy products was associated with an increased risk of prostate cancer. And though the association between eating other animal products and prostate cancer wasn't as clear — meat diets showed both increased and unchanged risks — plant-based diets appeared to actually decrease that risk.
"Our review highlighted a cause for concern with high consumption of dairy products," lead author John Shin, a Mayo Clinic oncologist, said in a press release. "The findings also support a growing body of evidence on the potential benefits of plant-based diets."
Around one in every nine American men will be diagnosed with prostate cancer, according to the American Cancer Society, making it one of the most common cancers in the U.S. Prostate cancer also has the second-highest mortality rate out of all cancers for men in the U.S., leading to 31,620 deaths annually.
Analyzing previous studies, the researchers found that dairy products are usually the leading source of calcium in Western countries, which have higher rates of prostate cancer compared to Asian countries, where dairy products aren't consumed as much.
It's thought that increased calcium levels are associated with prostate cancer, as the calcium can halt the formation of a type of vitamin D called calcitriol, which could otherwise prevent the proliferation and spread of prostate cancer cells. The study did not identify how much dairy per person was associated with the increased risk, the Daily Mail reported.
For the report, the researchers examined 550 scholarly references sourced from three databases. After excluding articles that did not investigate the link between diet and prostate cancer, as well as letters, editorials and case reports, the researchers found 47 usable studies published in scientific journals between 2006 and February 2017, which involved more than 1 million participants in total, Newsweek reported. These included cohort studies ranging in size from small to very large, case-control studies, meta-analyses and a population study.
But the researchers acknowledged this range was also a weakness because of the differing methods employed by the studies. Future research, they said, should have standardized methods for collecting data to better account for non-dietary factors and include randomized controlled trials.
Experts not involved in the study agreed. David Montgomery, director of research at Prostate Cancer UK, said that the findings could not yet replace weight, age and ethnicity as primary factors driving prostate cancer risk.
"The previous studies are of variable quality and have not consistently taken account of other factors beyond diet that could impact the results," Montgomery told FoodNavigator. "We would not encourage anyone to avoid or increase intake of certain foods as a result of this study."
Still, the association between plant-based foods and prostate cancer continues to grow. Another recent study this month found that eating at least three servings of mushrooms each week was associated with a reduced risk of prostate cancer.
- Prostate Cancer and Milk: Is There a Connection? ›
- Diet as Cancer Treatment: You Can't 'Starve' Cancer - The Atlantic ›
- Calories, Carbs, Fat, Fiber: Unraveling The Links Between Breast ... ›
- Prostate Cancer Prevention with Proper Nutrition ›
- Prostate cancer prevention: Ways to reduce your risk - Mayo Clinic ›
EcoWatch Daily Newsletter
A jury in Missouri awarded a farmer $265 million in a lawsuit that claimed Bayer and BASF's weedkiller destroyed his peach orchard, as Reuters reported.
A coalition of local and national groups on Friday launched a legal challenge to a Louisiana state agency's decision to approve air permits for a $9.4 billion petrochemical complex that Taiwan-based Formosa Plastics Group plans to build in the region nationally known as "Cancer Alley."
Well, he told us he would do it. And now he's actually doing it — or at least trying to. Late last week, President Trump, via the U.S. Department of the Interior's Bureau of Land Management, announced that he was formalizing his plan to develop lands that once belonged within the Bears Ears and Grand Staircase-Escalante National Monuments in southern Utah. The former is a stunningly beautiful, ecologically fragile landscape that has played a crucial role in Native American culture in the Southwest for thousands of years; the latter, just as beautiful, is one of the richest and most important paleontological sites in North America.