Original sentence: A gluten-free diet is a diet which excludes foods containing gluten.It is used as a food additive in the form of a flavoring, stabilizing or thickening agent, often as "dextrin"
Edited sentence: A gluten-free diet is a diet free of gluten.It is used as a food additive in the form of a flavoring, stabilizing or thickening agent, often hidden under "dextrin"