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Is Organic Food Safer? continued...

Man-made pesticides aren't the only threats to food safety. There is also the question of natural toxins produced by the plants themselves. In this arena, conventional foods may actually have the advantage.

Because organic production steers clear of synthetic insecticides and herbicides, organic crops usually contend with more pests and weeds than conventional crops. This means the organic plants may produce more natural toxins.

"Plants can't get up and walk away. If they're being attacked, they've got to sit there and take it. So they may resort to their own chemical warfare," explains Carl Winter, director of the FoodSafe program and an extension food toxicologist at the University of California, Davis.

These natural pesticides could be just as harmful to people -- or even more so -- than the synthetic pesticides used in conventional agriculture. One familiar example is solanine, a substance produced by potatoes as they turn green, which can make you ill if you ingest too much of it.

Another safety concern that has been raised about organic food is the issue of manure fertilizers. Some critics fear that using manure to fertilize organic crops might increase the risk of contamination by dangerous microbes like E. coli.

"The organic farmers talk about the soil being more alive on organic farms than conventional farms. That life isn't just insects and worms; it's loaded with bacteria," says Klurfeld.

But organic production standards do include strict rules on the composting and application of manure. And there's little evidence that organic food has bacterial contamination more often than conventional food.

"The organic system is the only one with agricultural standards that prohibit the use of raw manure within a certain time frame between harvests of crops for human consumption," says the Organic Trade Association's DiMatteo. She adds that bacterial contamination usually happens because of improper handling after the food has left the farm, and conventional food is just as likely to be affected.

Whether the issue is bad bacteria or pesticide residues, experts agree that the best way to safeguard yourself is to thoroughly rinse allfruits and vegetables under running water. You should even wash items with inedible skins, like melons and citrus fruits, because cutting the rind with a knife can bring contaminants to the inside.

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