"Beyond that, Gapstur said, a body of research supports the idea that excess weight itself influences cancer development.
For instance, extra body fat affects levels of "sex hormones," like estrogen, she said. This may be one reason excess weight is connected to breast and endometrial cancers.
Plus, Gapstur said, that extra weight can help feed chronic inflammation in the body, which is thought to contribute to a range of diseases, including various cancers."
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