A new long-term study conducted in the U.S. has found that people who regularly consume ultra-processed foods may face a 41% higher risk of developing lung cancer — even if they have never smoked.

The findings add to growing global concern over the health effects of diets high in industrially manufactured foods.

What are ultra-processed foods?

The term "ultra-processed foods" (UPFs) refers to food items that undergo industrial processing and typically contain ingredients not commonly used in home kitchens — such as artificial flavors, preservatives, emulsifiers, and colorings.

These include seemingly harmless items like packaged yogurt, chips, processed bread, frozen meals, flavored milk, and even some breakfast cereals.

While UPFs offer convenience, affordability, and longer shelf life, numerous studies have linked them to a variety of health concerns.

New evidence links upfs to lung cancer

According to the study — published via a leading medical platform — researchers tracked the health records and dietary habits of 1,706 American adults over 12 years. All participants developed lung cancer during the study period.

After adjusting for factors like smoking, air pollution, and genetic predispositions, the study still found that individuals with high UPF consumption were 41% more likely to develop lung cancer compared to those with low intake.

This suggests that the diet itself may be an independent risk factor, not just a contributor.

Smoking not the only culprit

Lung cancer has long been associated with smoking, but this study challenges the assumption that non-smokers are at low risk. Even among participants who had never smoked, the risk remained elevated if their diet included large amounts of ultra-processed foods.

This opens up new conversations around preventive health, urging medical professionals and nutritionists to focus more closely on dietary choices, not just smoking cessation.

Health experts urge dietary changes

Nutritionists emphasize that the key to lowering cancer and chronic disease risks lies in consuming whole, minimally processed foods. These include:

Fresh fruits and vegetables
Legumes and beans
Whole grains like oats, brown rice, and barley
Lean proteins and natural dairy products

Limiting intake of UPFs and replacing them with whole-food alternatives can improve not only physical health but also mental well-being, as earlier studies have linked UPFs to obesity, heart disease, diabetes, and depression.

The study’s findings offer a wake-up call for people who think they are safe from serious illnesses like lung cancer simply because they don’t smoke.

As ultra-processed foods continue to dominate supermarket shelves and fast-food menus, being mindful of what we eat — and choosing nutrient-rich, natural alternatives — might be a life-saving decision.