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“What’s GMO stand for?” a driver yelled at Flo Oakes and her group outside the Nashville Farmers’ Market on Saturday morning.

“Genetically modified organisms,” they hollered back.

A few dozen people held banners and shouted slogans here as part of a nationwide rally demanding action to help consumers identify from where food comes.

Genetically modified organisms have had changes introduced into their DNA by genetic engineering techniques. The changes make them resistant to viruses and chemicals. Typical plants and products include soybeans, corn and canola and cotton seed oil.

“I’m not a biologist, not a scientist,”Oakes said. “I feel like we’re being guinea pigs. We have never put genes together like this and then put them in the environment without proper scrutiny and testing.”

Activists want genetically modified foods labeled and they want limits on how closely such plants can be grown to organic agriculture to prevent cross-contamination. They also want more research on the safety of genetically modified organisms.