Healthy diet and lung cancer risk: a surprising link explained

A recent study from researchers at University of Southern California has uncovered an unexpected association: nonsmokers who follow healthier diets rich in fruits, vegetables, and whole grains appear to have higher rates of early-onset lung cancer. However, scientists stress that this does not mean these foods cause cancer.

Instead, the researchers suggest that environmental factors—particularly pesticide residues—may help explain the connection. They plan further studies to investigate how such exposures might influence cancer risk.

Although lung cancer deaths in the U.S. have declined significantly in recent decades, a concerning trend has emerged: increasing rates of lung cancer among younger nonsmokers, especially women. To better understand this, scientists analyzed data from a nationwide study focused on young-onset lung cancer.

The study included 187 patients, most of whom were women and nonsmokers. Participants were grouped based on genetic characteristics of their tumors, including those linked to the EGFR pathway and other mutations. Researchers also examined lifestyle factors such as smoking history, contraceptive use, and diet.

Diet quality was assessed using the Healthy Eating Index, with higher scores indicating healthier eating habits. Surprisingly, patients in key groups had higher-than-average scores and consumed more vegetables, legumes, and whole grains than the general population.

Researchers emphasize that this is only a statistical association. One possible explanation is that people who eat more plant-based foods may also have higher exposure to pesticide residues present in these products.

Another notable finding was the high rate of oral contraceptive use among women in certain groups. While this does not prove causation, it suggests another potential factor worth investigating, particularly since hormonal pathways may play a role in tumor development.

Experts caution against misinterpreting the findings. The study has not yet been published in a peer-reviewed journal, and more research is needed. Maintaining a healthy diet remains essential, as poor nutrition is linked to obesity and increased risk of various diseases, including other cancers.

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