In a widely circulated report by the Chicago Tribune's Jon Van, Lack of nanotech safety research 'serious', Andrew Maynard, a science adviser to the Woodrow Wilson Center's project on emerging nanotechnologies, is quoted as saying:
"No projects are specifically addressing the potential effects of nanomaterials in the gastrointestinal tract. Given the large number of current nanoproducts that are supposed to be eaten, such as food and nutritional supplements, that is a curious and serious omission."
A simple search reveals this claim to be false. Here are only a few I had time to find: