Eating chili peppers may raise the risk of one deadly cancer
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- Researchers published a Frontiers in Nutrition meta-analysis pooling 14 observational studies with over 11,000 participants, including more than 5,000 people diagnosed with gastrointestinal cancers.
- Highest chili pepper consumers faced a 64% greater overall risk of gastrointestinal cancers and were nearly three times more likely to develop esophageal cancer compared with the lowest intake group.
- Stomach cancer showed a 77% higher risk among heavy chili pepper consumers, but the increase did not reach statistical significance, and no significant rise was found for colorectal cancer.
- Geographic patterns diverged: studies from Asia, Africa, and North America linked high chili intake to elevated cancer risk, while European and South American studies found no increase or even lower risks.
- Capsaicin, the compound behind chili peppers' heat, activates TRPV1 receptors and may cause chronic irritation of the esophageal lining, though researchers say this remains a hypothesis.
- Authors concluded the evidence 'suggest[s] that chili pepper is a risk factor for certain GI cancers (e.g., EC),' while emphasizing that observational data cannot prove causation and that dose effects remain unknown.
- A separate umbrella review found spicy food linked to lower cardiovascular and premature-death risks but inconsistent digestive-cancer results, underscoring the mixed evidence base.
Why it matters: For the billions who eat chili peppers daily, the dose question is unresolved: researchers cannot yet say whether moderate intake carries the same risks as the heaviest consumption seen in Asian, African, and North American studies. The near-tripling of esophageal cancer risk in heavy consumers demands larger longitudinal studies before any dietary guidance changes.
