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Big Dairy Is Putting Microscopic Pieces of Metal in Your Food

The rapid emergence of nanotechnology suggests that size does, indeed, matter. It turns out that if you break common substances like silver and nickel into really, really tiny particlesmeasured in nanometers, which are billionths of a meterthey behave in radically different ways. For example, regular silver, the stuff of fancy tableware, doesnt have any obvious place in sock production. But nano-size silver particles apparently do. According to boosters, when embedded in the fabric of socks, microscopic silver particles are strongly antibacterial to a wide range of pathogens, absorb sweat, and by killing bacteria help eliminate unpleasant foot odor. (By most definitions, a particle qualifies as nano when its 100 nanometers wide or less. By contrast, a human hair clocks in at about 80,000 nanometers in diameter.)

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According to the Project on Emerging Nanotechnologies (PEN)a joint venture of Virginia Tech and the Wilson Centerthere are more than 1,600 nanotechnology-based consumer products on the market today. If SmartSilver Anti-Odor Nanotechnology Underwear sounds like a rather intimate application for this novel technology, consider that the PEN database lists 96 food items currently on US grocery shelves that contain unlabeled nano ingredients. Examples include Silk Original Soy Milk, Rice Dream Rice Drink, Hersheys Bliss Dark Chocolate, and Krafts iconic American Cheese Singles, all of which now contain nano-size titanium dioxide*. As recently as 2008, only eight US food products were known to contain nano-particles, according to a recent analysis from Friends of the Eartha more than tenfold increase in just six years.

All of which raises the question of safety. Radically miniaturized particles are attractive to the food and textile industries for their novel properties. Nano-size titanium dioxide, for example, is used as a color enhancerit makes white foods like yogurt and soy milk whiter, and brightens dark products like chocolate. But what unintended effects might it have?

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Thats where the nano story gets murky. Remarkably, the US Food and Drug Administration, which oversees the safety of the food supply, both 1) acknowledges that nanoparticles pose risks that are substantially different from those of their regular-sized counterparts, and 2) has done nothing to slow down their rapid move into the food supply.

Back in 2012, the FDA released a draft, pending public comment, of a proposed new framework for bringing nano materials into food. The document reveals plenty of reason for concern. For example: so-called nano-engineered food substances can have significantly altered bioavailability and may, therefore, raise new safety issues that have not been seen in their traditionally manufactured counterparts. The report went on to note that particle size, surface area, aggregation/agglomeration, or shape may impact absorption, distribution, metabolism and excretion (ADME) and potentially the safety of the nano-engineered food substance.

What FDA is saying here is obvious: If nanoparticles didnt behave differently, the industry wouldnt be using them in the first place.

So whats the remedy? Rather than require rigorous safety studies before companies can lace food with nanoparticles, the FDAs policy draft proposes nonbinding recommendations for such research. Even that rather porous safety net doesnt yet existthe agency still hasnt implemented the draft proposal it released more than two years ago.

Meanwhile, according to the Friends of the Earth report, nano-laced food products are entering the market at a rate of three to four per week. And theres real evidence that the small stuff poses significantly higher health risks. For example, in 2011, the National Institute for Occupational Safety and Health (NIOSH) looked at the lung cancer risk faced by workers exposed to air containing various forms of titanium dioxide dust. The agency recommended sharply lower exposure limits for titanium dioxide in its nano formthe stuff theyre putting in yogurt and soy milkreflecting greater concern for the potential carcinogenicity of the nano particles, because as particle size decreases, the surface area increases (for equal mass), and the tumor potency increases per mass unit of dose.

Of course, breathing in nano-size titanium dioxide isnt the same as ingesting it in yogurt. But making stuff really tiny changes the way it behaves in our bodiesand the FDA should respond to its own concerns by making the food industry sweat the safety of the small stuff, before they feed it to us.

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*Clarification: This list originally included Dannon Plain Greek Yogurt. On June 5, a spokesperson for Dannon contacted me to dispute the claim that its Greek yogurt contains titanium dioxide: We make Dannon plain yogurt with only yogurt cultures and nonfat milk. We dont use any ingredients in Dannon plain yogurt that contain titanium dioxide. In the event we use an added color in our products we label it as an added ingredient. My source was the Project on Emerging Nanotechnologies (PEN)a joint venture of Virginia Tech and the Wilson Centerwhich keeps an inventory of nanotechnology-based consumer products introduced on the market, which had listed Dannons Plain Greek Yogurt. PENs source, in turn, is a 2012 paper called Titanium Dioxide Nanoparticles in Food and Personal Care Products, by researchers led by Arizona State Universitys Paul Westerhoff, which found trace amounts of Titanium Dioxide in the Dannon product.

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