It is estimated that over 400 companies worldwide are using nanotechnology in food processing and packaging, and there are already 300 nano-foods on the market. For example over ten thousand tonnes of nanomaterials (!) in different forms are used in commercial production in Australia each year. Since there are no labelling requirements for products that contain nanomaterials, secrecy surrounds the commercial use of nanotechnology and nanomaterials by the food industry, and makes it impossible to know for sure whether or not a given product contains nano-ingredients.