Additionally, fat calls can have direct and indirect effects on the regulation of tumor growth. Finally, obese people often have regular inflammation which is associated with higher risks of cancer.
There are other mechanisms within the body which might also account for the altered immune responses such as oxidative stress on the body.
Many studies link obesity to increased risk of cancer, but it is also something exacerbated by age with regard to the risk for breast cancer. The higher risk of breast cancer is often seen in post-menopausal women and not in obese women who are not post-menopausal.
The relationship between cancers and obesity is clear. And yet, it should not even be an issue on the table. Obesity must be stopped and it begins with losing 2.2 pounds per adult. With something as simple as this, cancer cases and health care costs would be reduced drastically.