Move over, bacon — lots of other things also cause cancer

Processed Meat Causes Cancer, Red Meat Could Too, Says WHO

On Monday, the France-based International Agency for Research on Cancer (IARC) came out with the strongest findings yet that processed meat (like bacon and ham) causes colorectal cancer in humans.

The agency also found that red meat (beef, lamb, etc.) may increase your risk of developing the same type of cancer.

Colorectal cancer is the third-most common type of cancer in the US, according to the American Cancer Society.

See photos of common foods suspected of causing cancer:

Common foods suspected of causing cancer
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Move over, bacon — lots of other things also cause cancer

Microwave popcorn

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Non-organic fruit

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Processed meats

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Farmed salmon

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Refined sugars

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Canned tomatoes 

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Potato chips

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Hydrogenated oils

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Artificial sweeteners

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Foods that are highly salted, pickled, or smoked

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Red meat

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Highly processed white flours

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"Diet" or "Low Fat" anything

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Genetically modified organisms (GMO's)

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Americans have a 1 in 20 chance of developing it within their lifetime, and the disease is expected to cause about 49,000 deaths this year.

So, how does eating bacon and other deliciously salty processed meats shape up in terms of overall cancer risk?

Here's a list developed by the WHO of the leading carcinogens. Research shows you can reduce your risk of developing cancer by avoiding these:


Tobacco use, of any kind, accounts for 22% of cancer-causing deaths each year. That's about 1.4 million for the year 2004, the WHO estimates.

In part, that's because of the many different types of cancer tobacco use can cause, including mouth, throat, kidney, bladder, pancreas, and lung cancer.

And cancer isn't the only risk that comes with using tobacco. Right now 16 million Americans are living with a disease caused by smoking, according to the CDC.


If there is any food or drink you should be avoiding if you're worried about cancer, research suggests it's alcohol, which has been linked with a myriad of different cancers including cancer of the oral cavity, pharynx, larynx, oesophagus, liver, colorectum, and breast.

Based on a number of studies, the more alcohol a person drinks regularly over time, the higher her risk of developing one of these alcohol-associated cancers. About 3.5% of all cancer-related deaths in the US in 2009 were alcohol-related.

What's more, out of all mouth and oropharn cancers, about 22% are attributable to alcohol use in men; about 9% of those cancers are attributable to alcohol use in women.

Excessive alcohol use can be deadly in other ways, too — the WHO estimates that each year 2.5 million deaths are associated with alcohol consumption, and 320,000 of those deaths are people between the ages of 15 and 29.


You are exposed to a small level of ionizing radiation — radiation that reaches a certain energy threshold capable of stripping electrons from other atoms — on a daily basis, but it doesn't stop you from enjoying a sunny day, and it doesn't stop doctors from taking an X-ray of broken bones.

Ultra-violet radiation from the sun, X-ray radiation from certain medical equipment, and exposure to radioactive elements like radon gas are all examples of ionizing radiation.

But the second leading cause of lung cancer after tobacco smoke is exposure to radon gas from soil and building materials. The WHO estimates that between 3 to 14% of all lung cancers are caused by exposure to radon gas.

According to the US Nuclear Regulation Commission, anyone exposed to 5,000 millisieverts or greater at one time will likely die without medical treatment. For comparison, you get about 10 millisieverts from one Computed Tomography (CT)-abdomen and pelvis test.

In high doses, ionizing radiation can cause life-threatening cancers like leukaemia and solid tumors. However, it is difficult to assess how many people die of radiation-related cancer each year because so few people are exposed to life-threatening levels.

Learn more about how much radiation you receive from different medical exams on


Sometimes, cancer can be caused by infections with viruses, bacteria, or parasites. Nearly 22% of cancer deaths in developing countries and 6% in industrialized countries are due to infectious diseases, according to the WHO.

For example, viral hepatitis B and C can cause liver cancer, while the sexually transmitted human papillomavirus (HPV, pictured above) can cause cervical cancer. Also, the bacterium Helicobacter pylori (which causes stomach ulcers) can increase the risk of stomach cancer. Parasitic infections like schistosomiasis, a parasitic disease carried by snails, and liver fluke, a parasitic flatworm that lives in the liver, have also been found to cause cancer.

Even though infections can increase a person's risk of getting cancer, most people don't end up getting them, according to the American Cancer Society. Getting vaccinated and avoiding infections are the best protection, but diet and other factors also play an important role.


Air, water and soil pollution also have a role in causing cancer.

to 4% of cancers are caused by carcinogens from drinking water or polluted air." type="spreadWord"%

For example, diesel exhaust contains harmful gases and soot that have been linked to cancer in both humans and animals, especially lung cancer.

But often, the worst pollution is found indoors. Smoke from coal fires doubles the risk of lung cancer, especially in women who don't smoke, and is responsible for 1.5% of lung cancer deaths worldwide, according to the WHO.

And it's not just air pollution. In a part of Bangladesh contaminated with arsenic, a naturally occurring element that is toxic to humans, 5% to 10% of cancer deaths were linked to the toxic chemical.

Work hazards

Many people are exposed to carcinogens at work. There are more than 40 known substances found in work environments that are known to cause cancer of the lung, bladder, larynx (throat), and skin, as well as leukemia and nasopharyngeal cancer.

For example, asbestos, a well-known carcinogen, causes lung cancer and mesothelioma, a rare cancer of the outer lining of the lung or chest cavity.

And tetrachlorethylene (perchloroethylene), a substance used in dry cleaning, has also been found to be carcinogenic.

About 20% to 30% men and 5% to 20% of women (of working-age) may have been exposed to lung carcinogens during their careers, according to the WHO. That's about 10% of lung cancers worldwide.

Physical activity and diet

And last but not least is how you treat your body — both by what you put into it and your regular exercise regimen.

The WHO states that diets high in fruits and vegetables "may have a protective effect against many cancers," while diets high in red and processed meat come with a greater risk of colorectal cancer.

However, when it comes to the types of foods you eat, cancer should be low on your list of worries. Yes, you should be aware of what you put into your body, but how much you put in should be number one on your radar.

That's because obesity is linked to cardiovascular diseases like stroke and heart disease, which were the leading causes of death worldwide in 2012, according to the WHO.

In the US alone, 610,000 people die of heart disease each year — that's 12 times more than the people expected to die of colorectal cancer this year.

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Move over, bacon — lots of other things also cause cancer
GOOD MORNING AMERICA - Former GMA anchor Joan Lunden revealed that she is battling breast cancer on 'Good Morning America,' 6/24/14, airing on the ABC Television Network. (Photo by Lou Rocco/ABC via Getty Images)
GOOD MORNING AMERICA - Sandra Lee talks about being cancer free, on GOOD MORNING AMERICA, 9/22/15, airing on the ABC Television Network. (Photo by Ida Mae AStute/ABC via Getty Images)
NEW YORK - MARCH 21: (FILE PHOTO) Actor Robert De Niro attends a news conference March 21, 2002 in New York City. According to a spokesman, De Niro, 60, was diagnosed with prostate cancer, but is expected to make a full recovery. (Photo by Mario Tama/Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1233 -- Pictured: (l-r) Musical guest Carly Simon performs on September 26, 1997 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
BALDWIN, NY - OCTOBER 07: Actress Fran Drescher attends the Fourth Annual Breast Cancer Summit Honoring Fran Drescher at The Coral House on October 7, 2014 in Baldwin, New York. (Photo by Mike Pont/Getty Images)
Cynthia Nixon during T. Schreiber Studio and the Leukemia and Lymphoma Society Honor Cynthia Nixon - Arrivals at 3 West Club in New York City, New York, United States. (Photo by Lawrence Lucier/FilmMagic)
LAS VEGAS - NOVEMBER 15: Rod Stewart performs at the Mandalay Bay Events Center for 'Rock for the Cure' at the Mandalay Bay Resort & Casino on November 15, 2007 in Las Vegas, Nevada. (Photo by Jacob Andrzejczak/Getty Images)
MELBOURNE, AUSTRALIA - SEPTEMBER 28: Olivia Newton-John speaks to the media as she supports the Cancer & Wellness Centre by preparing to leading the way on a charitable walk at The Centre Ivanhoe on September 28, 2014 in Melbourne, Australia. The walk aims to raise funds for the wellness and supportive care programs provided to patients. (Photo by Robert Prezioso/Getty Images)
Edie Falco attends Super Saturday 13 to Benefit Ovarian Cancer Research Fund hosted by InStyle Magazine at Nova's Ark Project on July 31, 2010 in Water Mill, New York.

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