Eating lots of fruits, vegetables, and whole grains is usually good for health. It can lower the chance of many diseases, including many types of cancer.
Surprising New Findings
Scientists at the USC Norris Cancer Center discovered something unexpected. Young people under 50 who never smoked and who eat more of these healthy foods than most people seem to get lung cancer more often.
"We found that younger non‑smokers who eat a lot of healthy foods have a higher chance of lung cancer," said Dr. Jorge Nieva, the study leader. "This raises questions about an unknown risk that comes from the food itself."
Could Pesticides Be the Culprit?
The researchers do not think the fruits, veggies, or grains are bad. They think the chemicals used on them—pesticides—might be involved.
Non‑organic produce often has more pesticide residues than meat, dairy, or many processed foods. Past studies show that farm workers exposed to pesticides for many years have higher lung‑cancer rates. This supports the idea that pesticide exposure could play a role.
Women May Be More Affected
The study also showed that women under 50 who never smoked get lung cancer more often than men in the same age group. Those women also tended to eat more fruits, vegetables, and whole grains than the men.
Rising Cases in Young Non‑Smokers
Lung cancer has usually been linked to older adults, smokers, and men. The average age at diagnosis is 71.
Even though smoking has gone down since the 1980s, lung cancer is becoming more common in non‑smokers aged 50 or younger, especially women.
What the Study Looked At
Researchers started the Epidemiology of Young Lung Cancer Project. They studied 187 people who were diagnosed with lung cancer before age 50. Most had never smoked and had a type of lung cancer that is biologically different from the kind caused by tobacco.
The participants filled out surveys about their diet, smoking history, and other details. Their eating habits were compared to the general U.S. population using the Healthy Eating Index (HEI), which scores diet quality from 1 to 100.
Healthier Diets Among the Patients
The young, non‑smoking patients scored an average of 65 on the HEI, while the national average is 57. Women scored a little higher than men.
On average, they ate 4.3 servings a day of dark green vegetables and beans, and 3.9 servings of whole grains. Most Americans eat about 3.6 servings of dark greens and beans and 2.6 servings of whole grains each day.
More Research Is Needed
Dr. Nieva says the link between pesticide exposure and lung cancer is still a hypothesis. The study did not measure pesticide levels in the participants’ food directly. Instead, the researchers used published data about average pesticide residues in food groups.
Future work will test blood or urine samples for pesticide chemicals. This could show which pesticides, if any, raise lung‑cancer risk.
Understanding these factors could help public‑health officials give better advice and could lead to new ways to prevent lung cancer in young adults.