Researchers at the University of Southern California found that non-smokers under 50 who ate more fruits, vegetables and whole grains had a higher likelihood of developing lung cancer.
The observational study analyzed dietary, smoking and demographic data from 187 lung cancer patients diagnosed at age 50 or younger.
Among non-smokers in the study, those with healthier-than-average diets rich in dark green vegetables, legumes and whole grains were more likely to have lung cancer compared to the average U.S. Adult.
Researchers hypothesized that pesticide residue on conventionally grown produce could be a contributing factor, noting that non-organic fruits, vegetables and grains typically carry higher pesticide residues than dairy, meat and many processed foods.
Agricultural workers exposed to pesticides tend to have higher rates of lung cancer, which supports the hypothesis that dietary pesticide exposure may play a role in young non-smokers.
The study was presented at the annual meeting of the American Association for Cancer Research in San Diego but has not yet been peer-reviewed or published in a journal.
For more on this story, see Study Links Fruit and Vegetable Consumption to Increased Lung Cancer Risk.
Young-onset lung cancer in non-smokers under 50 has been increasing in recent years, with non-smoking women making up a significant portion of cases.
What the study actually measured
The research compared the diets of young lung cancer patients to average U.S. Adult dietary patterns, focusing on fruit, vegetable and whole grain consumption among non-smokers.
It did not establish causation between healthy eating and lung cancer but identified a correlation warranting further investigation into pesticide exposure.
Why this matters for public health
The findings challenge the assumption that diets high in fruits and vegetables universally reduce cancer risk and suggest a need to examine farming practices and food safety regulations.
This follows our earlier report, Pesticides on Produce Linked to Lung Cancer in Non-Smokers.
More research is needed to confirm whether pesticide residue from conventionally grown produce contributes to lung cancer in young non-smokers before public health guidance can be revised.
Should people stop eating fruits and vegetables to avoid lung cancer?
No, the researchers did not recommend avoiding fruits and vegetables; they emphasized that more research is needed to understand the potential role of pesticide residue.
Is organic produce safer in this context?
The study did not test organic versus conventional produce directly, but researchers noted that commercially produced non-organic fruits, vegetables and grains are more likely to have higher pesticide residue.