The title of the news story should be "Obesity apparently responsible . . "
Although there is no concrete science on why obesity increases a person's risk for cancer, scientists hypothesize that excess estrogen released by body fat could be the culprit in cancers such as estrogen-receptor positive breast cancers.
Studies have also shown that increased body fat can lead to increased levels of oxidative stress and inflammatory compounds in the blood, which are linked to DNA mutation and diseased cell growth, as is seen in many cancers.
The American Cancer Society applauded the new research, but said the report is only the first step.
What I really hate about this type of research is now no one is going to think twice, they're going to assume obesity causes cancer, end of story. The only surefire thing that scientists know about obesity is that it stresses the body, all the specifics are not even solid fact. It's all theories and possibilities. As the story points out, this research really doesn't prove anything since the researchers themselves have only found a correlation.
Obesity stresses out the body, if you're body is worn out you have less of an ability to fight off infectious or intrusive ailments. If you stood any chance at fending off cancer cells before... chances are higher that your body will not have the ability to do so if you're obese.