Republished: obesity and colorectal cancer

Area of Science:

• Oncology
• Metabolic Health
• Epidemiology

Background:

• Excess body weight, categorized by body mass index (BMI), is linked to numerous diseases and is a leading cause of mortality.
• Overweight and obesity are associated with approximately 11% of colorectal cancer (CRC) cases in Europe.
• Obesity presents a 30-70% increased risk for colon cancer in men, with a less consistent association in women.

Purpose of the Study:

• To explore the association between excess body weight and colorectal cancer risk and outcomes.
• To investigate the role of visceral fat and BMI in cancer risk.
• To examine potential mechanisms linking obesity to CRC and discuss implications for preventive strategies.

Main Methods:

• Review of epidemiological data on body mass index (BMI), overweight, and obesity in relation to colorectal cancer (CRC) and adenoma.
• Analysis of the impact of visceral versus subcutaneous fat and BMI increases on cancer risk.
• Discussion of potential biological mechanisms and clinical implications.

Main Results:

• Obesity is a significant risk factor for colorectal cancer (CRC), especially in men, and may be linked to poorer cancer outcomes.
• A higher BMI, particularly increased visceral fat, correlates with elevated cancer risk.
• Obesity may reduce sensitivity to certain cancer therapies, though surgical outcomes are generally unaffected apart from wound infection risk.

Conclusions:

• Obesity is a critical risk factor for colorectal cancer (CRC), necessitating targeted preventive strategies.
• Further research is needed to elucidate the complex biological mechanisms, including metabolic syndrome, insulin resistance, adipocytokines, gut microbiota, and bile acids.
• The significant cancer risk associated with obesity raises questions about the potential role of prophylactic bariatric surgery in select individuals.