A growing body of research continues to show that what we eat can influence the progression of certain diseases, including cancer. Now, new findings suggest that excessive peanut consumption could play a role in helping cancer cells spread — a warning that may be especially relevant for those already diagnosed.
Too many peanuts could fuel cancer spread
In a study published in the journal Carcinogenesis, researchers from the University of Liverpool examined what happens in the body after eating a large amount of peanuts. They focused on agglutinin, a plant protein naturally present in peanuts. Volunteers with cancer consumed 250 grams of peanuts — roughly two full cups — and blood tests taken an hour later showed increased levels of agglutinin. This protein appeared to interact with blood vessel walls, triggering the release of cytokines. While cytokines normally help immune cells communicate, certain types may also create conditions that support metastasis, enabling cancer cells to spread more easily. The takeaway: for cancer patients, eating peanuts in large amounts could be risky.
No link to higher mortality
The findings don’t mean peanuts increase cancer death rates. Lead researcher Professor Lu-Gang Yu notes that earlier studies found no effect on mortality or life expectancy in men with prostate cancer. He adds that smaller quantities of peanuts may produce much lower agglutinin levels and could be harmless — but moderation remains key.
A matter of balance
For most healthy people, peanuts remain a nutrient-rich snack packed with healthy fats, protein, and minerals. But for those with cancer, especially in advanced stages, this study highlights the importance of portion control. As with many foods, the dose makes the poison — and knowing when to stop may be just as important as knowing what to eat.
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