Obesity or being overweight increases the risk of various forms of cancer. The results of a recent study released by the Lancet medical journal in London , indicating overweight can increase the risk of esophageal cancer include the bladder, uterus and esophagus.
Although studies suggest a link between excess weight with cancer risk, but there is no definite evidence that shows weight gain can lead to cancer. "To infer causality, we need to conduct further research," explains Dr. Andrew Renehen, who led the study.
The researchers compiled data from 141 studies and considered more types of cancers and more diverse population than the results of previous studies. The study includes more than 28,000 cases of cancer in North America, Europe, Australia, and Asia.
The study participants were either overweight or normal weight, were followed for 9 to 15 years. Researchers observe their body mass index and mengkorelasinya with cancer cases that arise.
From the study of known weight above 15 pounds of normal weight in the male may increase the risk of kidney cancer in up to 24 percent and up to 52 percent of the esophagus. While excess weight by over 13 kilometers of normal weight among women at increased risk of cancer of the uterus and bladder up to 60 percent.
In Asian populations, there is a tighter connection between the accretion of body mass index with risk of breast cancer. Scientists do not yet have certainty how excess weight can make people susceptible to cancer.
"One hypothesis that arises is the excess fat can affect hormone levels in the body where at some level likely to trigger the growth of tumors," Renehan said.
"Simple message that can be delivered is if you manage to keep the standards of normal weight, the lower your risk of esophageal cancer," said Ed Yong of Cancer Research UK. The study, published in The Lancet was funded by the British Medical Association, University of Manchester and University of Bern, Switzerland.
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