Impacts of GMOs on Animals

Numerous animal feeding studies have verified that GMOs cause problems. In the 1990s, Dr. Arpad Pusztai’s research showed that rats fed genetically modified potatoes showed potentially precancerous cell growth in their digestive tract, smaller brains, livers, testicles, partial atrophy of the liver and damaged immune system in just 10 days.

Because of the unique nature of his research design, he was able to conclude that these problems resulted from the generic process of genetic engineering, not the particular gene that was inserted into the potatoes.

More recent research shows a wide range of problems, including organ damage, reproductive problems, immune system activation, premature death, tumors, cancer, etc… We see this in laboratory animals.

We’ve also heard stories from veterinarians that when GMOs were introduced into the food supply and the feed supply, the health of both livestock and pets took a big drop. Dr. Michael Fox, who was a syndicated columnist for the column called Animal Doctor, received letters from all over the country – 25-30 million readers just after GMOs were introduced.

People talked about unprecedented levels of allergies, itching and digestive problems like diarrhea. He sent letters back to those individuals saying, “Take them off the GMOs,” and has a file drawer filled with responses saying it worked.

If you go to you can read more about the impact on pets. We’ve also heard from livestock veterinarians. Again, major problems with the health of cows, pigs and other livestock soon after GMOs were introduced.

When farmers and veterinarians take their animals off GMOs and put them on non-GMO feed, they get better. There’s dramatic evidence for this that we see over and over again.