How Many Cancers Have Been Caused by Arsenic-Laced Chicken?

In 2013, Maryland became the first state to ban the feeding of an arsenic-containing drug to chickens. This arsenic-containing drug is used to control parasites and gives chicken meat an “appealing pink color.” In 2011, the FDA found that the livers of chickens fed this drug had elevated levels of inorganic arsenic, a known human carcinogen. In response, the drug’s manufacturer, Pfizer, voluntarily pulled the drug off the U.S. market. However, it’s still sold overseas—including to places that continue to export chicken back to us—and a similar arsenic-containing drug is still available in the United States. The Maryland ban was still some help, though; it kept Maryland farmers from using stockpiles of the drug.

How much arsenic gets into the actual meat and not just the internal organs? We didn’t know until recently. Researchers at the Johns Hopkins School of Public Health coordinated the purchase of chicken breasts off grocery store shelves in ten cities across the country. They found that 70% of the samples of chicken meat from poultry producers that didn’t prohibit arsenic drugs were contaminated with the cancer-causing form of arsenic at levels that exceeded the safety thresholds originally set by the FDA (before the FDA relented and admitted that there’s really no safe level of this kind of arsenic).

When the drug was first approved, scientists believed that its organic arsenic base would be excreted unchanged (organic arsenic is much less dangerous than inorganic arsenic). Guess what appears to convert the drug into the carcinogenic form? Cooking. When chicken meat is cooked, levels of the arsenic-containing drug go down and levels of carcinogenic arsenic go up, suggesting the drug may degrade into the cancer-causing inorganic arsenic form during cooking.

How much cancer are we talking about? If we estimate that about three-quarters of Americans eat chicken, then the arsenic in that chicken has potentially been causing more than 100 cases of cancer every year. The John Hopkins researchers conclude that “eliminating the use of arsenic-based drugs in [poultry and pig] production could reduce the burden of arsenic-related disease in the U.S. population.”

Arsenic-containing drugs fed to chickens is one of the ways arsenic gets into rice. When we feed arsenic to chickens, the resulting arsenic-bearing poultry manure is introduced to the environment, soil, and water, and rice sucks it up from contaminated soil and can transfer it to people who don’t even eat chicken. There is massive environmental contamination from the poultry industry; nearly two million pounds of arsenic has been poured into the environment every year by the U.S chicken industry alone.

We’re even seeing arsenic in foods sweetened with organic brown rice syrup. It reminds me of the arsenic in apple juice story. Although the U.S. made lead and arsenic-based pesticides illegal years ago, they still persist in the soil, so even organic products are not immune.

There are other sources of arsenic (such as naturally occurring arsenic deposits), but arsenic-containing poultry drugs have been deliberately administered to animals intended for human consumption for 70 years. Consequently, exposures resulting from use of these drugs are far more controllable than are exposures from environmental sources. And the good news is that, thanks to a lawsuit from the Center for Food Safety and other consumer groups, three out of the four arsenic-containing drugs fed to poultry have been officially pulled from the market.

I’ve previously addressed this issue in my video Arsenic in Chicken. It’s nice to see there’s been some progress!

In health,
Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my free videos here and watch my live year-in-review presentations Uprooting the Leading Causes of DeathMore Than an Apple a Day, and From Table to Able.

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Alexandra Richards
Alexandra Richardsabout a month ago

Thank you.

Sue H
Sue H2 months ago

Thanks for sharing.

Peggy B
Peggy B2 months ago


Glennis Whitney
Glennis W3 years ago

Everyone has cancer cells, it just takes some little thing to start it off, we can't for see the future of our health, wish we could though.

Glennis Whitney
Glennis W3 years ago

If I stopped eating everything they say are terrible, I would be living on fresh air,

Heidi Aubrey
Heidi Aubrey3 years ago

Thank you Dr. Greger for showing us the immense greed or possibly ignorance(probably greed) that factory farmers are willing to poison its customers.

Carole R.
Carole R4 years ago

Scary stuff.

Sharon Stein
Sharon Stein4 years ago

More water contains arsenic in most of the world then the plants take it up....THEN YOU ARE SICK!

Elena Poensgen
Elena Poensgen4 years ago

Thank you

Sybil G.
Sybil G4 years ago

If you don't mind pesticides and herbicides, artificial colors and flavors, hormones and antibiotics, GMOs and MSG and HFCS, and sugar everywhere in your food, surely, you won't mind a little arsenic in your chicken?

If the first 10 ingredients have not killed you yet, surely a little added arsenic won't make much difference.

Enjoy your, er..., food.