They may be small, crunchy, and a favourite snack for many, but new research suggests that peanuts could pose a hidden risk for people living with cancer — particularly when consumed in large amounts.
How peanuts could influence metastasis
A study published in Carcinogenesis by researchers at the University of Liverpool examined what happens in the body after eating a large serving of peanuts. Patients with cancer were given 250 grams — roughly a full bag — and their blood was tested an hour later.
The team found elevated levels of peanut agglutinin, a plant protein naturally present in peanuts. This protein appeared to interact with the cells lining blood vessels, triggering the release of cytokines — signalling molecules that help immune cells communicate.
While cytokines are essential for immune function, certain types may also promote the development of metastases — the spread of cancer cells to other parts of the body.
Moderation matters
The findings don’t mean peanuts are inherently dangerous for everyone, nor do they suggest an increased mortality risk. Professor Lu-Gang Yu, one of the study’s authors, pointed out that previous research found no link between peanut consumption and survival rates in men with prostate cancer.
However, he emphasised that high quantities — like the amount used in the study — could be problematic for patients already diagnosed with cancer. Smaller portions are likely to produce lower agglutinin levels, which may be harmless.
The takeaway
For most people, peanuts remain a nutritious snack, packed with protein and healthy fats. But for those undergoing cancer treatment, moderation may be wise — especially if you tend to eat them by the handful. As with many foods, the key lies in portion control and understanding how your individual health might interact with what’s on your plate.
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Theo is a dynamic fitness coach who brings energy, realism, and flavor to healthy living. His content is about strong bodies, positive minds, and meals that fuel both.