New Study Questions Link Between Diet and Lung Cancer in Young Non-Smokers

A recent study is stirring up discussions about a potential connection between healthy eating habits and the risk of lung cancer among younger individuals who don’t smoke. Researchers are suggesting that exposure to pesticides might play a role in this phenomenon.

The findings were shared by the University of Southern California’s Health Sciences during the annual American Association for Cancer Research meeting, focusing on patients under 50 who were diagnosed with lung cancer despite never having smoked.

The study highlights an increasing trend of lung cancer cases in young, non-smoking adults, especially women, even as overall smoking-related diagnoses decline.

Research Links Improved Diet Quality to Rising Lung Cancer Cases

The research looked at 187 patients involved in the Epidemiology of Young Lung Cancer Project, examining data related to diet, lifestyle, and diagnoses. The majority of these participants had never smoked and were diagnosed before reaching 50.

Lead investigator Jorge Nieva pointed out that younger non-smokers with lung cancer reported significantly healthier diet patterns compared to the average population.

Nieva stated, “Our research indicates that younger non-smokers who consume more healthy foods than the general population are at a higher risk of developing lung cancer.”

Diet quality was assessed using the Healthy Eating Index, where participants scored an average of 65 against the national average of 57. Additionally, they reported consuming more fruits, vegetables, and whole grains on a daily basis.

Interestingly, women in the study had higher diet scores than their male counterparts, and they were also found to have a greater likelihood of being diagnosed with lung cancer in this age demographic.

Pesticide Exposure Considered a Possible Contributing Factor

The study raises the possibility that pesticide exposure from conventionally grown produce could be a contributing factor, although it stops short of confirming a direct link.

Nieva emphasized that fruits, vegetables, and grains might carry higher levels of pesticide residues compared to other food types. He also referenced increased lung cancer instances among agricultural workers who have been exposed to pesticides as additional supporting evidence.

However, the research didn’t directly assess pesticide levels in the participants; instead, they estimated exposure based on existing data related to pesticide residues in various food groups.

The research team plans to conduct further testing that would involve blood and urine samples to gain more insight into whether specific pesticides are associated with a heightened risk of cancer.

While lung cancer is typically not associated with non-smokers, especially those under 50, cases have been rising, particularly among women, in recent years.

Nieva remarked, “This work is a vital step toward pinpointing modifiable environmental factors that might contribute to lung cancer in younger adults.”

This follows a July 2025 study which controversially claimed that cheese can induce nightmares, and another study from December that suggested smelling one’s own farts could have protective effects against Alzheimer’s.