While many of us focus on avoiding obvious carcinogens like tobacco, some everyday habits may quietly raise our cancer risk without us even realizing it. According to Dr. Ajit Pai, a surgical oncologist, certain foods and lifestyle choices are especially harmful to your gut and gastrointestinal lining—often setting the stage for cancers of the stomach, colon, pancreas, and beyond.
Here are six habits Dr. Pai warns against—and why cutting them back could help protect your long-term health:
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1. Relying on Ultra-Processed Foods
Convenience foods may be easy to reach for, but they come at a cost. “Eating ultra-processed food, which is food coming out of a bottle or a container repeatedly—especially if the food is reheated and used again and again—is extremely harmful,” says Dr. Pai. These foods often contain chemical additives and preservatives that can damage the gut and increase cancer risk.
2. Eating Charred Red Meat
Grilling season comes with its own risks—especially if you love the blackened crust on your steak. “Use of a lot of barbecued meats, especially red meat... [with] black char on it, is extremely damaging,” Dr. Pai explains. The high-temperature cooking process produces nitrosamines, compounds linked to cancers of the food pipe and stomach.
3. Consuming Too Much Pickled or Salted Food
Pickled and preserved foods might pack flavor, but they’re also packed with salt—something your stomach lining doesn’t love. “Eating a lot of pickled food and stored food high in salt damages the gastric lining and causes gastric cancer,” Dr. Pai warns.
4. Using Tanning Beds
Tanning beds are a well-documented cancer risk, especially when used regularly or at a young age. The concentrated UV radiation they emit can damage skin cells and dramatically increase the risk of skin cancers, including melanoma—the deadliest form. Even occasional use has been linked to higher cancer rates, making it one habit worth avoiding entirely.
5. Using Tobacco in Any Form
Unsurprisingly, tobacco remains one of the most significant cancer risks. Dr. Pai emphasizes, “Tobacco use in any form” contributes to multiple types of cancer, from the mouth and throat to the lungs and beyond.
6. Drinking Alcohol—Even in Small Amounts
Think one drink a day is harmless? Think again. “There is no safe limit for alcohol,” Dr. Pai says. “Even a drink a day is damaging to the entire lining of the gut and can increase the risk of cancers—especially stomach, colon, rectal, pancreatic, and liver cancer when it causes cirrhosis.”
The Bottom Line
Many of these habits have become normalized in daily life—but experts like Dr. Pai stress the importance of awareness and moderation. Reducing your intake of processed and charred foods, limiting alcohol, and steering clear of tobacco can significantly lower your risk over time. “These small but consistent choices can either protect or harm your health,” he adds. “It’s up to you.”
