A group of mothers, scientists and environmentalists met with U.S. Environmental Protection Agency regulators on [May 27] over concerns that residues of Roundup, the world's most popular herbicide, had been found in breast milk. The meeting ... followed a five-day phone call blitz of EPA offices by a group called Moms Across America demanding that the EPA pay attention to their demands for a recall of Roundup. "This is a poison and it's in our food. And now they've found it in breast milk," said Zen Honeycutt, founder of Moms Across America. "Numerous studies show serious harm to mammals. We want this toxic treadmill of chemical cocktails in our food to stop." Roundup is an herbicide developed and sold by Monsanto Co. since the 1970s, and used in agriculture and home lawns and gardens. The chief ingredient, glyphosate, is under a standard registration review by the EPA. The agency has set a deadline of 2015 for determining if glyphosate use should continue as is, be limited or halted. Environmentalists, consumer groups and plant scientists from several countries have said in recent years that heavy use of glyphosate is causing problems for plants, people and animals. They say some tests have raised alarms about glyphosate levels found in urine samples and breast milk. In 2011, U.S. government scientists said they detected significant levels of glyphosate in air and water samples. Glyphosate is sprayed on most of the corn and soybean crops in the United States, as well as over sugar beets, canola and other crops.