(WASHINGTONPOST) — LOS ANGELES — Protesters rallied in dozens of cities Saturday as part of a global protest against seed giant Monsanto and the genetically modified food it produces, organizers said.

Organizers said “March Against Monsanto” protests were held in 52 countries and 436 cities, including Washington and Los Angeles, where demonstrators waved signs that read “Real Food 4 Real People” and “Label GMOs, It’s Our Right to Know.”

Genetically modified plants are grown from seeds that are engineered to resist insecticides and herbicides, add nutritional benefits or otherwise improve crop yields and increase the global food supply.

Most corn, soybean and cotton crops grown in the United States today have been genetically modified. But critics say genetically modified organisms can lead to serious health conditions and harm the environment. The use of GMOs has been a growing issue of contention in recent years, with health advocates pushing for mandatory labeling of genetically modified products even though the federal government and many scientists say the technology is safe.

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