While most major food companies publicly steer clear of nanotechnology, a large number of food and food-related items—including brand-name cereals, candy, cheese, chocolate, mayonnaise, plastic storage containers, and bottles—contain nanomaterials, added mainly to enhance color or extend shelf life. In fact, food nanotech, or the use of nanomaterials in food and food-related products, has been quietly growing over the past decade despite consumer mistrust and a lack of definitive knowledge over possible health harms.
Nanomaterials are engineered substances ranging in size from 1 to 100 nanometers (billionths of a meter). Because of their size, they have unique physico-chemical properties that are governed more by quantum mechanics than by ordinary chemistry. Food nanotech has the potential to enhance virtually all stages of production, from growing (nano-pesticides, nano-fertilizers), to preparation (nano-nutrients, nano-flavors), to packaging (nanofilms, nanosenor-enabled containers).
“For food and food-related science, engineered nanomaterials have the potential to transform how and what we eat through development of longer-lasting, better tasting, and safer, healthier foods,” says Chady Stephan, manager of global nanotechnology applications at PerkinElmer, which manufactures analytical and testing platforms for nanomaterials. Polymer nanotechnology, for example, “can provide new food packaging materials with improved mechanical barrier with antimicrobial properties together with nano-sensors for tracing and monitoring the condition of food during transport and storage,” Stephan tells Food Quality & Safety magazine.
Critics say that until the health effects are established, nanomaterials should be banned from foods or at least be strictly regulated. “Scientists agree that nanomaterials create novel risks that require new forms of toxicity testing. But very little testing and regulation of these new products exists, and consumers have almost no information,” says Jaydee Hanson, senior policy analyst at the Center for Food Safety.
Until a few years ago, Kraft Foods, Nestle, H.J. Heinz, Unilever, and other major food companies were enthusiastically pursuing food nanotech R&D, anticipating such innovations as nanoparticle emulsifiers to make food textures smoother and more uniform, nanoparticle colors and flavors to enhance appeal and taste, nanofilms and nanosensor-enabled “smart packaging” to detect, signal, and even prevent spoilage, and nanotech-enabled food contact surfaces to repel bacteria (see “Examples of Food Nanotech Applications” sidebar). But instead of responding positively, consumers have grown wary about the safety of nanotechnology. Most major food companies have halted their food nanotech programs or are keeping them tightly under wraps.
Chief among the health concerns is that nanomaterials in food can easily pass through biological barriers including cell membranes and cell nuclei. Nanoparticles can leach out of packaging material, such as transparent films, containers, and bottles. They can also be inhaled from the air and absorbed through the skin. Little is known about the health effects of nanomaterials as they move through the body and accumulate in tissues and organs. Research has found that some common nanomaterials, including nano-titanium dioxide (a whitening agent) and nano-silver (an anti-bacterial), can cause cellular dysfunction, including the over-production of reactive oxygen species and oxidative stress, a precursor to cellular damage, neurological disease, and cancer.
About Ted Agres
Ted Agres is an award-winning writer who covers food safety regulatory and legislative issues from the nation’s capital in the Washington Report column. He has 40 years of experience in reporting on issues such as health policy, medical technology, and pharmaceutical development. He holds an MBA from Johns Hopkins University and a bachelor’s degree from the University of Chicago. He enjoys playing the piano, amateur radio, and paintball. He lives in Laurel, MD. Reach him at firstname.lastname@example.org.