The connection between excess body weight and cancer extends far beyond statistical correlation—adipose tissue dysfunction creates a cellular environment that actively fuels malignancy. This comprehensive review reveals how disrupted fat metabolism transforms protective tissue into a cancer-promoting system affecting millions of Americans annually.
The mechanism centers on metabolic rewiring within dysfunctional adipose tissue. When fat stores exceed their energy storage capacity, excess free fatty acids leak directly into circulation, providing developing cancer cells with readily available fuel. Simultaneously, oxidative stress from overwhelmed fat cells damages DNA through genomic instability, creating the initial mutations that can trigger malignant transformation. The review identifies specific inflammatory mediators—prostaglandin E2, interleukins 1β and 6, and tumor necrosis factor α—that create systemic inflammation while suppressing immune surveillance mechanisms designed to eliminate abnormal cells.
This biological framework explains why obesity accounts for half of endometrial and liver cancers, representing roughly 10% of all new cancer diagnoses annually. The hormonal disruption component proves particularly significant for reproductive cancers, as excess adipose tissue increases estrogen production while decreasing protective adiponectin levels. Unlike genetic cancer predisposition, these metabolic pathways remain modifiable through intervention. However, the review highlights a critical gap in translating this mechanistic understanding into effective clinical strategies. While the biological connections are now well-established, developing targeted therapies that interrupt these pathways without compromising normal metabolic function remains an ongoing challenge requiring interdisciplinary approaches combining oncology, endocrinology, and metabolic medicine.