A major international study reports that following a Mediterranean-style diet may reduce obesity-related cancer risk even without changes in body weight.
By yourNEWS Media Newsroom
A large-scale international study has found that adherence to a Mediterranean-style diet is associated with a measurable reduction in obesity-related cancer risk, with researchers concluding the benefit appears independent of body weight or fat distribution.
The findings, published in JAMA Network Open, are based on data from more than 450,000 participants enrolled in the European Prospective Investigation into Cancer and Nutrition (EPIC), a long-running research project tracking diet and health outcomes across multiple countries. According to the analysis, individuals who most closely followed a Mediterranean diet experienced approximately a 6% lower risk of developing cancers associated with obesity compared to those with lower adherence.
Researchers said the results challenge conventional assumptions that weight loss is the primary driver behind diet-related cancer prevention.
“This was somewhat surprising,” said Inmaculada Aguilera-Buenosvinos, a postdoctoral scientist at University of Navarra’s Institute for Health Research. “Adherence to the Mediterranean Diet was associated with lower obesity-related cancer risk regardless of BMI (body mass index) or fat distribution.”
Participants in the EPIC study were between 35 and 70 years old at enrollment, which took place from 1992 to 2000 across 23 research centers in 10 European countries. These included Mediterranean nations such as Greece, Italy and Spain, as well as non-Mediterranean countries including Denmark, France, Germany and the United Kingdom. Over a median follow-up period approaching 15 years, 4.9% of participants were diagnosed with an obesity-related cancer.
Researchers indicated that the protective effect likely stems from biological mechanisms beyond weight control. The Mediterranean diet—rich in fruits, vegetables, whole grains, legumes, nuts, seeds, and olive oil—has long been associated with anti-inflammatory properties and improved metabolic function.
“This suggests that other mechanisms — such as reduced inflammation, improved metabolic health, or dietary interactions with the microbiome — may be responsible for the protective effects,” Aguilera-Buenosvinos said.
Outside experts pointed to the diet’s emphasis on fiber and plant compounds as key contributors. Lindsey Wohlford, a wellness dietitian at MD Anderson Cancer Center, said fiber supports gut health while plant-based foods provide antioxidants and phytonutrients that may help reduce inflammation.
Other researchers emphasized the contrast between Mediterranean eating patterns and highly processed Western diets. Neil Iyengar, an associate professor at Weill Cornell Medical College and oncologist at Memorial Sloan Kettering Cancer Center, said processed foods can contribute to oxidative damage linked to cancer development.
“What we put into our bodies every day can impact nearly every function of our body through hormones, fat and muscle tissue, and the delicate balance of bacteria in our gut,” Iyengar said. “Consuming a minimally processed, plant forward diet can help to reduce or even reverse the oxidative damage that a poor diet can cause to our body.”
Although the observed reduction in cancer risk was modest at the individual level, researchers noted its potential significance when applied broadly. Aguilera-Buenosvinos said even small percentage changes could translate into large numbers of preventable cancer cases across populations.
The study also found that strict adherence was not required to see benefits. Participants who occasionally deviated from the diet still experienced some reduction in risk, though less than those who followed it more consistently. Iyengar said this suggests that long-term patterns, rather than short-term perfection, may be key.
The protective effect appeared more pronounced among smokers, which researchers attributed to their higher baseline risk levels.
Experts said the findings may help shift public health messaging away from weight-focused strategies toward broader dietary patterns. For individuals accustomed to diets high in processed foods, incremental changes may offer a practical starting point.
Wohlford recommended focusing on adding nutrient-dense foods rather than eliminating entire categories. Incorporating items such as berries, nuts, and leafy greens into daily meals may help build sustainable habits over time.
Researchers said the results highlight a broader takeaway: dietary composition may influence cancer risk through internal biological processes, regardless of visible changes in body weight.
Source: Natural News
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