A new USC study found that non-smoking adults under 50 with the healthiest diets were actually more likely to develop lung cancer — and researchers think pesticide residues on fruits, veggies, and whole grains could be to blame. The findings are preliminary but raise urgent questions about an overlooked environmental risk factor. Women in the study were disproportionately affected.
Eating your fruits and vegetables is supposed to protect you from cancer — so why are the healthiest young eaters developing lung cancer at higher rates? A new study from USC Norris Comprehensive Cancer Center, presented at the American Association for Cancer Research annual meeting, found that non-smokers under 50 with above-average diet quality scores were more likely to be diagnosed with lung cancer than the general population. Researchers suspect the culprit isn't the food itself, but the pesticide residues commonly found on conventionally grown produce.
The study analyzed 187 people diagnosed with lung cancer by age 50, most of whom had never smoked. Their average Healthy Eating Index score was 65 — notably higher than the national average of 57. Women were disproportionately represented, both in lung cancer diagnoses and in healthier eating habits. Researchers note that commercially grown fruits, vegetables, and whole grains tend to carry higher pesticide residues than meat or dairy — and prior research links long-term pesticide exposure in agricultural workers to elevated lung cancer risk.
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Why it matters: Lung cancer in young non-smokers is rising — especially among women — and this study points to a potentially modifiable environmental factor. The next research phase will measure pesticide levels directly in patients' blood and urine, which could reshape dietary guidance and lung cancer prevention strategies.
