New Study Links Lung Cancer in Young Non-Smokers to Diet

A recent study from the University of Southern California examined 187 lung cancer patients under 50, most of whom had never smoked. Curiously, this group seemed to have healthier-than-average diets, prompting concerns about potential health risks related to certain fruits, vegetables, and grains.

These patients were diagnosed with a type of lung cancer that differs biologically from the form typically linked to smoking.

Interestingly, the group recorded an average Healthy Eating Index (HEI) score of 65 out of 100, which is quite a bit higher than the national average of 57. They consumed more fruits, vegetables, and whole grains than the average American adult, according to the findings.

Dr. Jorge Nieva, a medical oncologist and lead investigator at USC Norris Comprehensive Cancer Center, noted, “Our research indicates that younger non-smokers who eat healthier than the general population are more likely to be diagnosed with lung cancer. This counterintuitive result raises important questions about unexplored environmental risk factors related to these otherwise beneficial foods.”

The study also revealed that among patients, women appeared to be more frequently diagnosed with lung cancer than men in the same age group, despite both genders not smoking. Female patients reported eating more fruits, vegetables, and grains than their male counterparts.

However, there are limitations to this research. For one, it merely suggests a correlation between a healthier diet and lung cancer risk in participants—it doesn’t establish a direct cause. Also, the study is relatively small, so implications for a broader population remain unclear.

Dr. David Carbone, who contributed to the research, remarked that this theory has been circulating in lung cancer circles for years. As a leading expert in lung cancer research, he mentioned, “Over the years, I’ve observed that young patients with lung cancer often seem to be the healthiest individuals.”

He emphasized that the findings should not be taken as evidence that certain foods are poisonous. “This is certainly not proof that eating these things causes lung cancer—this kind of interpretation is an overreach. We’re looking at association, not causation,” he clarified.

One environmental factor that could be worth investigating is pesticides, as fruits and vegetables typically have higher pesticide exposure compared to other foods like dairy or meat. Agricultural workers, who handle pesticides pre- and post-planting, have also shown elevated lung cancer rates.

However, Carbone pointed out that pesticides shouldn’t be viewed as a definitive cause either. There hasn’t been targeted research on lung cancer patients who strictly consume organic diets. Moreover, this study did not measure pesticide levels in the patients’ diets or their bodies; it relied on estimated pesticide exposure levels for common produce.

Additionally, it’s important to note that the study was based in the U.S., where pesticide regulations differ greatly from those in Europe, which also faces cases of young non-smokers with lung cancer.

There’s a prevalent belief that washing produce can help mitigate pesticide risk, but Carbone noted, “Many pesticides, particularly insecticides, are designed to adhere to the fruit, making washing less effective.” This raises further questions about whether peeling fruits like bananas and oranges makes them less hazardous compared to others such as apples.

Carbone also highlighted a potential selection bias, noting that patients who volunteer for clinical studies often have healthier diets. This might skew results towards health-conscious individuals rather than representing the overall population of young non-smokers with lung cancer.

He summarized the findings by saying, “[The study] was exploratory, searching for signals, and this was one of them. All these points need further testing.”