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Diets High in Dairy Might Boost Colon Cancer Survival, a Bit
But, at least one expert strongly disagrees, and instead recommends that cancer patients avoid dairy

By Steven Reinberg
HealthDay Reporter

TUESDAY, June 24, 2014 (HealthDay News) -- A diet rich in dairy products may slightly extend the lives of people diagnosed with colon cancer, a new study suggests.

But at least one cancer doctor not involved with the study was skeptical of the research and its conclusions.

The study found that people who ate the most dairy lived slightly longer and had a lower risk of dying from any cause.

"If you are a colorectal cancer patient, calcium and milk consumption may improve your survival. But do not change your diet just yet before more research is conducted," said lead researcher Peter Campbell, who's with the American Cancer Society's epidemiology research program. The new study, he noted, showed only an association between dairy and survival -- it could not prove that dairy consumption was the direct cause of increased longevity.

"If our findings are replicated in future studies, we may see changes in dietary guidelines for cancer survivors: patients might be encouraged to increase calcium and milk intake," Campbell added.

But, Dr. Donald Abrams, an integrative oncologist at the University of California, San Francisco, and author of an accompanying journal editorial, had significant doubts about the study.

"It's silly to look at milk in isolation, because [according to the study] the people who drank the most milk also were the leanest, did the most physical exercise, ate less red meat, and ate more fruits and vegetables," he said. "The message is it's the whole diet, not a single component."

On a technical point, Abrams doesn't believe that a study such as this is meaningful. "Investigators are going to try to write as many papers as they can from their data and chop it up into little reductionist pieces, when it's much better to look at nutrition and diet more holistically," he said.

The report was published online June 23 in the Journal of Clinical Oncology.

For the study, Campbell's team collected data on almost 2,300 people diagnosed between 1992 and 2009 with colon cancer that had not spread beyond the colon.

By 2010, among those in the study, 949 patients had died -- 408 from their cancer. The researchers found that those who ate the most dairy and therefore got the highest amount of dietary calcium lived slightly longer. The authors say their finding was "marginally statistically significant."

In addition, those who drank the most milk had a 28 percent lower risk of dying from any cause, the researchers noted.

The study authors believe the survival benefit may be from the calcium in dairy, not the vitamin D. They also suggested that calcium may hinder cancer-cell growth and its ability to settle in sites far away from the original cancer.

What cancer patients eat does make a difference, Abrams noted. "They should eat a healthy diet and try to avoid the standard American diet," he said.

Abrams would rather people skipped dairy altogether. Dairy is high in saturated fat, and affects hormones that might increase the risk of other cancers, he noted in his editorial.

"I believe dairy should be avoided by all people, let alone people with cancer," he said.

Abrams noted that studies find that people diagnosed with colon cancer who eat "meats and sweets" don't do as well in survival and cancer recurrence as patients who eat a diet rich in fruits and vegetables.

More information

For more about colon cancer, visit the American Cancer Society.

SOURCES: Peter Campbell, Ph.D., epidemiology research program, American Cancer Society; Donald Abrams, M.D., integrative oncologist, University of California, San Francisco; June 23, 2014, Journal of Clinical Oncology, online

Copyright © 2014 HealthDay. All rights reserved. URL:http://consumer.healthday.com/Article.asp?AID=689120

Resources from HONselect: HONselect is the HON's medical search engine. It retrieves scientific articles, images, conferences and web sites on the selected subject.
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