Consumer advocates taking part in a food safety conference in Orlando, Florida, this week said food produced by using nanotechnology is quietly coming onto the market, and they want U.S. authorities to force manufacturers to identify them.

Nanotechnology involves the design and manipulation of materials on molecular scales, smaller than the width of a human hair and invisible to the naked eye. Companies using nanotechnology say it can enhance the flavor or nutritional effectiveness of food.

“I think nanotechnology is the new genetic engineering. People just don’t know what’s going on, and it’s moving so fast,” Jane Kolodinsky, a consumer economist at the University of Vermont, said at the conference.

Michael Hansen, a senior scientist with the Consumers Union, said polls show that 69 percent of Americans are concerned about eating cloned meat.

Hansen said there is scant public awareness, however, about foods produced through nanotechnology. New consumer products created through nanotechnology are coming on the market at the rate of 3 to 4 per week, according to an advocacy group, The Project on Emerging Nanotechnologies (PEN), based on an inventory it has drawn up of 609 known or claimed nano-products.

On PEN’s list are three foods — a brand of canola cooking oil called Canola Active Oil, a tea called Nanotea and a chocolate diet shake called Nanoceuticals Slim Shake Chocolate.

According to company information posted on PEN’s Web site, the canola oil, by Shemen Industries of Israel, contains an additive called “nanodrops” designed to carry vitamins, minerals and phytochemicals through the digestive system.

The shake, according to U.S. manufacturer RBC Life Sciences Inc., uses cocoa infused “NanoClusters” to enhance the taste and health benefits of cocoa without the need for extra sugar.

The tea, says manufacturer Shenzhen Become Industry & Trade Co., Ltd. of China, is prepared with nanotechnology to “release effectively all of the excellent essences of the tea” and increase by a factor of 10 “the selenium supplement function.”

Hansen, whose organization publishes the nonprofit product-testing magazine Consumer Reports, said there is no requirement that nano-products be identified as such.

He called for stronger federal regulations to require safety testing and labeling.

“Just because something is safe at the macro level, doesn’t mean it’s safe at the nano size,” Hansen said. “All scientists agree that size matters.”

Hansen said recent studies have shown that nano-sized particles in some cases can invade cells and breach the blood-brain barrier, and that some forms of nano-sized carbon could be as harmful as asbestos if inhaled in quantity.

“This represents science at the cutting edge. These technologies raise basic scientific issues,” Hansen said.

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