Quick Facts

• High adherence to Mediterranean diet linked to 29% lower gastric cancer risk in analysis of 1.3 million people
• Each 1-point increase in Mediterranean diet score reduces stomach cancer risk by 5%
• Diet’s anti-inflammatory compounds and antioxidants may inhibit tumor growth and regulate cell death

A comprehensive analysis of 11 studies involving 1.3 million participants shows that following the Mediterranean diet closely reduces gastric cancer risk by 29%.

Researchers combined data from five cohort studies and six case-control studies to examine the relationship between Mediterranean diet adherence and stomach cancer. The analysis revealed that people with the highest adherence to the diet had a 29% lower risk compared to those with the lowest adherence.

The study found a clear dose-response relationship. Each one-point increase in Mediterranean diet score corresponded to a 5% reduction in gastric cancer risk. This suggests that even moderate improvements in diet quality can provide meaningful protection.

Geographic Differences Emerge

The protective effects varied by location. Non-Western countries showed stronger associations, with a 72% risk reduction compared to 25% in Western nations. Case-control studies demonstrated more dramatic results than prospective cohort studies, showing 56% versus 12% risk reductions respectively.

Gastric cancer ranks as the fifth most common cancer worldwide, with over 960,000 new cases annually. It causes nearly 660,000 deaths each year, making it the third leading cause of cancer-related mortality globally.

Multiple Protection Mechanisms

The Mediterranean diet’s cancer-fighting properties stem from several mechanisms. The diet’s high content of antioxidants, polyphenols, and bioactive compounds helps modulate gene expression and inhibit tumor growth.

Studies show the diet significantly reduces inflammatory markers including C-reactive protein, tumor necrosis factor-alpha, and interleukin-6. Chronic inflammation plays a key role in cancer development, making this anti-inflammatory effect particularly important.

Components like olive oil, fish, and tomatoes provide anti-angiogenic properties that may prevent tumor blood vessel formation. The diet’s fiber-rich plant foods support healthy gut bacteria and provide compounds that reduce body-wide inflammation.

Protection Beyond Weight Loss

Recent research indicates the Mediterranean diet’s cancer protection works independently of weight management. A 2025 study found the diet reduced obesity-related cancer risk regardless of body mass index or fat distribution patterns.

The diet’s benefits extend beyond gastric cancer. Meta-analyses show Mediterranean diet adherence reduces overall cancer mortality by 14% across multiple cancer types including colorectal, breast, and prostate cancers.

Italian health organizations now formally recommend the Mediterranean diet for cancer prevention. The recommendations come from collaborative efforts involving over 20 scientific societies and Italy’s National Institute of Health.

Read more: Eating This Way Could Lower Risk Of Gastric Cancer By Almost 30%, Study Finds