Obesity is reshaping the global cancer landscape, and the liver is one of its most vulnerable targets. Drawing on emerging research and his experience as a gastrointestinal and cancer surgeon, Dr. Saurabh Bansal (Gastrointestinal, Laparoscopic, Cancer and Robotic Surgery Specialist and Consultant at Apollo Spectra Hospital and National Heart Institute, New Delhi) explains how not just excess weight, but also the type of fat we consume, can influence the risk of hepatocellular carcinoma. In this article, he outlines why choosing plant‑based fats over animal fats may offer a practical, evidence‑based way to protect liver health in an increasingly obese world.
Every year, the attention turns to cancer prevention and the role lifestyle choices play in reducing risk. Obesity has emerged as one of the most significant global health challenges, with consequences extending far beyond diabetes and heart disease. One of its most serious yet under-recognised outcomes is liver cancer.
Hepatocellular carcinoma (HCC), the most common form of liver cancer, is increasingly linked to obesity and metabolic dysfunction‑associated fatty liver disease (MAFLD). Recent research shows that liver cancer risk is shaped not only by excess body weight but also by diet quality, particularly the type of fats consumed.
A decade‑long study published in 2025 clarified this link. Researchers examined whether cancer risk in obesity is driven simply by excess fat or whether the source of dietary fat matters. The findings were clear: diets rich in animal‑derived fats such as butter, lard and beef tallow significantly accelerated tumour growth in obese models. In contrast, diets based on plant‑derived fats, including palm oil, olive oil, and coconut oil, did not promote cancer growth, even when obesity levels were comparable.
Obesity, fatty liver disease and rising liver cancer risk
Obesity is now recognised as an independent risk factor for liver cancer. It promotes fat deposition in the liver and increases insulin resistance, a key metabolic disturbance that accelerates the development of fatty liver disease. Obesity drives MAFLD, which begins with fat accumulation in the liver and may progress to inflammation, fibrosis, cirrhosis and ultimately cancer. Large population studies consistently show that individuals with obesity face a higher risk of HCC and poorer outcomes, partly because fatty liver disease often remains silent for years.
Sustained weight loss can slow or reverse fatty liver disease and reduce liver cancer risk. However, long‑term weight management is difficult for many, shifting attention towards diet composition, especially the role of dietary fats in liver health.
A balanced dietary approach for liver health
Obesity also weakens immune surveillance, the body’s ability to detect and eliminate abnormal cells. The 2025 Nature Metabolism study showed that animal‑fat‑rich diets generate metabolic by‑products that suppress immune cells involved in cancer control. This allows abnormal cells to proliferate more easily. Plant‑based fats did not have this effect and, in some cases, preserved immune function even in the presence of obesity.
Plant oils, particularly palm oil, are also being actively studied for their naturally occurring phytonutrients, such as tocotrienols and their potential role in cancer prevention. Initially thought to exert their benefits mainly through antioxidant activity, growing evidence suggests that these compounds influence multiple cellular signalling pathways involved in cancer growth and survival and have shown selective anti-cancer effects in experimental studies involving liver, breast, colorectal, pancreatic and prostate cancers.
The key message is clear: liver cancer prevention is not about eliminating fats but about choosing the right ones. Fats are an essential nutrient, yet their source matters. Diets high in animal fats appear to intensify cancer‑promoting processes in obesity, while plant‑derived fats support healthier immune responses.
A practical first step is reducing animal fats and replacing them with plant‑based alternatives such as olive oil, mustard oil, palm oil and coconut oil. Combined with regular physical activity and good metabolic control, balanced dietary patterns are associated with slower progression of fatty liver disease and a lower risk of liver cancer.
As MAFLD is projected to become the leading cause of liver cancer worldwide, informed dietary choices are increasingly important. In an obese world, preventing liver cancer is not only about weight loss; it is also about selecting the right fats to protect long‑term liver health.
