Obesity And Sugar Are Linked To Cancer
There's a link between obesity and 40 percent of all the cancers diagnosed in the United States, health officials reported Tuesday. And more recently than this report was published, sugar has also been confirmed as a link to Cancer.
That doesn't mean too much weight is causing all these cancer cases, just that there's some kind of still-to-be explained association, according to the U.S. Centers for Disease Control and Prevention.
Still, the study findings suggest that being obese or overweight was associated with cancer cases involving more than 630,000 Americans in 2014, and this includes 13 types of cancer.
"That obesity and overweight are affecting cancers may be surprising to many Americans. The awareness of some cancers being associated with obesity and overweight is not yet widespread," Dr. Anne Schuchat, CDC deputy director, said during a midday media briefing.
The 13 cancers include: brain cancer; multiple myeloma; cancer of the esophagus; postmenopausal breast cancer; cancers of the thyroid, gallbladder, stomach, liver, pancreas, kidney, ovaries, uterus and colon, the researchers said.
Speaking at the news conference, Dr. Lisa Richardson, director of CDC's Division of Cancer Prevention and Control, said early evidence indicates that losing weight can lower the risk for some cancers.
According to the new report from the CDC and the U.S. National Cancer Institute, these 13 obesity-related cancers made up about 40 percent of all cancers diagnosed in the United States in 2014.
Although the rate of new cancer cases has decreased since the 1990s, increases in overweight and obesity-related cancers are likely slowing this progress, the researchers said.
Of the 630,000 Americans diagnosed with a cancer associated with overweight or obesity in 2014, about two out of three occurred in adults aged 50 to 74, the researchers found.
Excluding colon cancer, the rate of obesity-related cancer increased by 7 percent between 2005 and 2014. During the same time, rates of non-obesity-related cancers dropped, the findings showed.
In 2013-2014, about two out of three American adults were overweight or obese, according to the report.
Key findings include:
- Of all cancers, 55 percent in women and 24 percent in men were associated with overweight and obesity.
- Blacks and whites had higher rates of weight-related cancer than other racial or ethnic groups.
- Black men and American Indian/Alaska Native men had higher rates of cancer than white men.
- Cancers linked to obesity increased 7 percent between 2005 and 2014, but colon cancer decreased 23 percent. Screening for colon cancer is most likely the reason for that cancer's continued decline, Schuchat said.
- Cancers not linked to obesity dropped 13 percent.
- Except for colon cancer, cancers tied to overweight and obesity increased among those younger than 75.
The new report was published online Oct. 3 in the CDC's Morbidity and Mortality Weekly Report.
Dr. Farhad Islami is strategic director of cancer surveillance research for the American Cancer Society.
He said it's "important to note that only a fraction of the cancers included in the calculation in this report are actually caused by excess body weight."
According to Islami, "many are attributable to other known risk factors, like smoking, while for many others, the cause is unknown. Obesity is more strongly associated with some cancers than others."
The World Cancer Research Fund estimates that "20 percent of all cancers in the United States are caused by a combination of excess body weight, physical inactivity, excess alcohol, and poor nutrition. The American Cancer Society is currently doing its own extensive calculation of the numbers and proportions of cancer cases attributable to excess body weight, the results of which will be published soon," he said.
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