Diet of fruits and vegetables associated with lung cancer in young non-smokers

New Research Links Diet to Lung Cancer Risk in Young Non-Smokers

Recent research suggests an unexpected connection between a diet high in fruits and vegetables and lung cancer in young non-smokers. This observational study, led by Dr. Jorge Nieva from the USC Norris Comprehensive Cancer Center, was presented at the American Association for Cancer Research (AACR) annual meeting in San Diego, though it hasn’t been peer-reviewed yet.

The study analyzed dietary habits, smoking history, and demographic information of 187 lung cancer patients under the age of 50. Interestingly, among non-smokers, those who maintained a healthier-than-average diet rich in fruits, vegetables, and whole grains showed an association with lung cancer development.

Participants in the study reported consuming more dark leafy vegetables, legumes, and whole grains compared to the average adult in the United States.

Researchers speculated that the pesticides used on conventionally grown produce might play a role in the disease. Dr. Nieva pointed out that non-organic fruits, vegetables, and whole grains likely contain more pesticide residues than other food groups like dairy and meat. Additionally, he noted that agricultural workers exposed to pesticides have higher lung cancer rates.

“Many lung cancer patients don’t have a smoking history,” Dr. Nieva remarked, highlighting a troubling trend; even with declining smoking rates, lung cancer incidence is rising in non-smokers under 50, particularly among women.

Dr. Nieva emphasized the need to better understand why healthier diets might not be protective against lung cancer for certain individuals, especially as many young patients seemed to eat better than the average American before their diagnosis.

However, the study has limitations. It largely relies on survey data, which is subjective and may be influenced by participants’ recollections about their food intake. Plus, the self-selected nature of the participants could introduce bias.

The research didn’t test specific foods for pesticide levels. Instead, it used average pesticide data for various food types. Looking forward, Dr. Nieva plans to analyze blood and urine samples for direct measurements of pesticide exposure.

While the study indicates a correlation, it doesn’t establish causation, leading Dr. Nieva to advise washing produce and choosing organic options when feasible.

“Identifying modifiable environmental factors related to lung cancer in young adults is essential,” he stated, hoping this research will inform future public health recommendations.

Dr. Mark Siegel, a senior medical analyst, acknowledged the study’s interest but noted it raises more questions than it answers. He mentioned the need for further inquiries to better understand the pesticide exposure levels and its implications.

Kayla Nichols from the Pesticide Action & Agroecology Network echoed the need for in-depth research on the increased lung cancer risks, especially for those consuming high-fiber diets from crops. She stressed the importance of addressing chronic, low-level pesticide exposure and implementing stronger public safety policies.