We're always told that fruits, veggies, and whole grains are the superheroes of a healthy diet. But a new study from the University of Southern California (USC) has thrown in a twist: young non-smokers who ate lots of these foods showed a higher risk of lung cancer.

Before you panic, scientists stress it's not the produce itself but it's the pesticides often sprayed on conventionally grown crops. The study, presented at the American Association for Cancer Research's 2026 meeting, analyzed 187 patients diagnosed with lung cancer at age 50 or younger. Surprisingly, their diets scored well above the national average on the Healthy Eating Index, with women scoring especially high.

Lead researcher Dr Jorge Nieva explained that pesticide residues on fruits, vegetables, and grains may be the hidden culprit. He noted that farm workers exposed to pesticides also show higher lung cancer rates.

The findings highlight a growing mystery: lung cancer is rising among non-smokers, especially women. While air pollution and hormone disrupting chemicals have been blamed before, this study suggests diet and pesticide exposure-could be another piece of the puzzle.