What Proportion / Percentage Of Foods Are Gluten? in Gluten-Free Foods, Products, Shopping & Medications Posted September 24, 2009 · Report to Admin OK thanks for your answers. I was just thinking that there were different levels of sensitivity etc. So if you ate 1 biscuit you may be fine, but then if you ate a whole packet, then that would be too much to handle. I guess I haven't got a gluten intolerance then as I can eat foods with gluten in and have no reaction. but then sometimes I eat a random meal and I get the same symptoms as celiac disease. I will have to keep searching to the source of my problems! Thanks.