What are the two foods linked to cancer?


Editorial team Published on

No single food directly "causes" cancer on its own, but processed meats and alcohol are the two dietary items most clearly classified as Group 1 carcinogens (known causes of cancer in humans) by health organizations like the World Health Organization.

Processed Meats

  • What they are: Meats preserved by curing, salting, smoking, or adding chemical preservatives, such as bacon, hot dogs, sausage, salami, and deli ham.
  • The risk: Eating them regularly is strongly linked to an increased risk of colorectal and stomach cancers.
  • Why it happens: Chemical preservatives called nitrites and nitrates can form cancer-causing compounds (nitrosamines) in the gut. Heme iron in meat can also damage the lining of the colon.

Alcohol

  • What it is: All forms of alcoholic drinks, including beer, wine, and hard liquor.
  • The risk: Alcohol increases the risk for several types of cancer, including breast, liver, bowel, mouth, throat, and esophageal cancers. There is no known safe amount.
  • Why it happens: The body breaks alcohol down into a toxic chemical called acetaldehyde, which damages cellular tissue and DNA.

Other Dietary Risks to Limit

  • Red meat: Beef, pork, and lamb are classified as probable carcinogens (Group 2A) when eaten in high amounts.
  • Ultra-processed foods: Items high in added sugars, refined starches, and unhealthy fats raise cancer risk indirectly by contributing to obesity and chronic inflammation.
  • Charred or burnt foods: Cooking meat at very high temperatures creates harmful chemicals (heterocyclic amines).

You can read more about dietary risk factors from the American Cancer Society or general guidance provided by MD Anderson Cancer Center.