The anticaking agent E551 silicon dioxide, or silica, has been used widely in the food industry over the past 50 years. Now, however, researchers working on the National Research Programme “Opportunities and Risks of Nanomaterials” have discovered that these nanoparticles can affect the immune system of the digestive tract……
http://www.safenano.org/news/news-articles/nanoparticles-as-food-additives-improving-risk-assessment/
