An apple a day keeps the doctor away — or so we thought. New research from the University of Southern California suggests young non-smokers with fruit- and veggie-packed diets may face a higher lung cancer risk than those with less healthy habits. “These counter-intuitive findings raise important questions about an unknown environmental risk factor for lung cancer related to otherwise beneficial food that needs to be addressed,” Dr. Jorge Nieva, a medical oncologist and lead investigator of the study, said in a press release . A diet rich in fruits, vegetables and whole grains is still widely seen as a cornerstone of good health. puhimec – stock.adobe.com In the study, Nieva and his colleagues analyzed 187 lung cancer patients under 50, who dished out details on their demographics, diet, smoking history and diagnosis. Notably, most had never lit up — and their cancers were biologically different from those typically linked to smoking.…